More Fun with the AX1 Antenna

Sometimes, you just have to be flexible. Originally, I had planned to do some bike riding today and experiment with a bike mount I cobbled together for my Elecraft AX1 antenna. However, Mother Nature decided to throw some freezing temperatures at me today. Instead of a cold bike ride, I opted for a more comfortable “stationary-mobile” POTA activation.

I loaded up my gear and made the quick trip to nearby Evansburg State Park (K-1351). My setup today was similar to the one I used a couple weeks ago. I used my AX1 antenna on a window mount. The rig today was my PennTek TR-35 (5 watts), coupled with an Elecraft T1 tuner. The TR-35 limited my operation to the 20M and 17M bands. With this simple setup, I was on the air within a couple of minutes of arriving. 

My window-mounted AX1 antenna
My window-mounted AX1 antenna

Contacts on 20M came as easily today as my last activation with the window mounted AX1. I had my first 10 contacts in about 15 minutes. I was pleased to get a call from K4SWL down in North Carolina. Thomas has a bunch of recent posts on the AX1 over at qrper.com. Of course, I had to let him know I was using an AX1 today.

The organized chaos in the cab of my truck, which includes my PennTek TR-35 and Elecraft T1 ATU.
The organized chaos in the cab of my truck, which includes my PennTek TR-35 and Elecraft T1 ATU.

After logging 20 contacts on 20M, I changed over to 17M. I didn’t have as much luck, but I made four contacts there. After that, I went back to 20M to make a couple of park-to-park contacts. My last contact was with WA3GM. Greg is a local ham who is spending some time in Florida and was activating a park down there.

I shut down after an hour of operating with 26 contacts in the log including 3 park-to-park contacts.That exactly matched the results from my last activation with the AX1. This little antenna never ceases to amaze me.

Hopefully, we’ll get some more moderate temperatures this week, so I can finally get that bike ride in.

72, Craig WB3GCK

Samurai Tactical Wakizashi Backpack

Over the past couple of years, some knee issues have slowed me down. My new knee joint resolved those issues, and life is getting back to normal—as normal as my life gets, I suppose. Anyway, I’m planning to get back to doing some light hiking this year as the weather improves. With that in mind, I bought a new backpack to use on day hikes.

For the past four years, I have been using the Rambler sling pack from Red Rock. It has been—and still is—a great backpack. It has plenty of storage for hauling a radio and accessories out to the field, and it is one sturdy, well-built pack. My only issue with it is that it is a sling pack. For short trips, it’s fine. But, for longer trips, having all the weight on one shoulder feels a bit “lopsided” to me. If I could have the same pack with two shoulder straps, I would be a happy camper (hiker).

A while back, I came across the Wakizashi backpack from Samurai Tactical and saved it to my Amazon wishlist. The Wakizashi is similar in size to my Rambler sling pack. While it has fewer storage pockets than my sling pack, it has more than enough storage for my needs. (I tend to carry too much stuff with me anyway.) 

When I purchased it, the Wakizashi backpack in black was selling for a mere $24 (USD). (Other colors are available at slightly higher prices.) For that price, if I didn’t like it, I could always give it to one of the grand-kids. The average ratings were 4.6 out of 5, so I took a chance and placed an order.

I should also note that I have no financial interest here; I paid for the backpack with my own funds. Also, the Amazon link above is not an affiliate link.

Amazon delivered the pack to a neighbor’s porch a few days later. I had to wander the neighborhood in the rain to find it. Not cool, Amazon. 

I wasn’t expecting much for a $24 backpack, but I was pleasantly surprised. For a cheap backpack, it seems well built. A few of the many reviews complained of poor stitching and general issues with quality. I saw none of that in the item I received. Mine was well-built, and the material appears to be durable enough. 

Samurai Wakizashi backpack. The patches and HT pouch were added by me.
Samurai Tactical Wakizashi backpack. The patches and HT pouch were added by me.

The pack measures 17.1 x 11.1 x 6.1 inches with a capacity of 24 liters. There’s a large main compartment and a smaller admin compartment. There are also two smaller compartments near the top of the pack. A side pouch is large enough for a water bottle, and there is plenty of MOLLE webbing on the sides and back. If you’re so inclined, it accommodates a hydration bladder and has a hydration port at the top of the bag.

Samurai Wakizashi backpack shoulder and sternum straps.
Samurai Wakizashi backpack shoulder and sternum straps.

Although the Wakizashi backpack has fewer compartments than my sling pack, there is enough storage to accommodate everything I normally carry in the field. Besides the radio gear, I always carry a small first aid kit, emergency poncho, headlamp, and a few other emergency items. The main compartment is a bit larger, so things that present a tight squeeze in the sling pack fit easily in the Wakizashi. 

I’ve been using this pack for the past couple of months now with no issues. How well it holds up in the long term remains to be seen. For now, anyway, I’m happy with this budget backpack.

73, Craig WB3GCK

Reviving My Old Car Window Mount

Recently, Thomas K4SWL over at QRPer.com featured an excellent guest post from W2AEW describing a car window mount Alan built for his Elecraft AX1 antenna. Inspired by Alan’s post, William KR8L, did some experimenting and came up with his own window mount. These folks got me thinking—a dangerous thing, sometimes.

I remembered a commercially made window mount I bought 25+ years ago. (I think it came from RadioShack, but I’m uncertain of that.) Back then, I was traveling for work a lot, and I usually took my old RadioShack HTX-202 HT along with me. When I was using a rental car, I used the window mount with a rubber duck antenna. When parked, I used a 2M half wave telescopic antenna on it. I hadn’t used it—or seen it—in years. It was somewhere amongst the miscellaneous stuff acquired over my 48 years in ham radio. 

It took a little searching, but after rummaging through some old parts, I found the old window mount. The mount is made of steel with a female BNC connector on it. It also has six feet of RG-58 coax attached. The coax is more than enough to reach the center console of my truck from the passenger side window. 

The old window mount I resurrected from the junk box. The bolt next to the BNC connector is something I added.
The old window mount I resurrected from the junk box. The bolt next to the BNC connector is something I added.

The next task at hand was to figure out a way to connect a counterpoise wire to the mount. The steel mount has a black coating on it, which electrically isolated the BNC connector from the mount. To resolve that, I removed the BNC connector and used a rotary tool to remove some of the coating around the mounting hole. Then, I drilled a hole for a small bolt that I could use as a place to attach an alligator clip for the radials. 

I already had an Elecraft AX1 antenna that I bought years ago when they first came out. I usually carry it in my backpack as a backup antenna, but I really haven’t used it very much. So, I guess it’s time to put it to use.

To see how this setup worked, I drove over to nearby Valley Forge National Historical Park (POTA K-0761) for a brief activation. Along with the AX1 on the window mount, I used two 12.5-foot radials. I have to admit it was nice being able to deploy an antenna in less than a minute. 

My AX1 deployed on the window mount with two radial wires clipped on.
My AX1 deployed on the window mount with two radial wires clipped on.

Back in the truck, I fired up my KX3 running five watts. I was prepared to crank the power up to 10 watts, if need be, but that proved unnecessary. Within a minute of spotting myself, the calls started coming in. The signal reports were decent, and I was seeing some strong hits on the Reverse Beacon Network. It took all of 12 minutes to make my prerequisite ten contacts.

In less than an hour, I had 14 contacts on 20M, nine on 17M, and three on 15M. Among those 26 QSOs, I had one park-to-park contact with a station in Quebec. At one point on 17M, I had a DX station calling. I believe it might have been Italy, but I just couldn’t pull out the entire callsign. My apologies to that station, wherever they were. 

The AX1’s performance was a pleasant surprise. Although it has been in my antenna arsenal for a few years now, I really haven’t given it a serious test. Well, that changed today. It has proven itself to be a worthy antenna choice, when a larger antenna is impractical.

Thanks to W2AEW and KR8L for inspiring me to dust off my old window mount and put it to good use.

72, Craig WB3GCK

Black Widow Pole Quick Fix

During my last POTA activation, the eyelet at the top of my trusty 20-foot Black Widow telescopic pole snapped off. This pole has served me well for over 25 years, so I can’t blame the pole. The Black Widow poles are still available from the manufacturer, so I could have just bought a new one. But hey, what fun would that be?

After staring blankly at the broken pole for a while, I rummaged through my stash of parts and came up with an easy fix. I found a small ring terminal that fit snugly over the top of the pole, so I just glued it on using some Loctite outdoor adhesive. In keeping with my usual practice, I added a small key ring (split ring) to the eyelet replacement. (For more on the rationale for the split ring, check out this post.)

My quick and dirty replacement for the broken eyelet on my Black Widow telescopic pole. I simply glued a ring terminal to the top section of the pole.
My quick and dirty replacement for the broken eyelet on my Black Widow telescopic pole. I simply glued a ring terminal to the top section of the pole.

Well, that was easy enough. Hopefully, this silly little hack will squeeze 25 more years of use left in this old pole. It probably won’t, but a guy can dream, right?

72, Craig WB3GCK

My New Toy

I keep saying that I need another rig like I need a hold in the head. I guess I have a hole in my head, because I recently bought another QRP rig. 

The rig I purchased was a (tr)uSDX transceiver. I had been thinking about getting one of these little rigs for several months before finally giving in and buying one. I placed an order with roWaves in Romania, and, to my surprise, I had it in my hands five days later. 

My new (tr)uSDX transceiver on the air for the first time
My new (tr)uSDX transceiver on the air for the first time

This rig is only about the size of a pack of cigarettes, but it sure packs a lot of functionality in there. I won’t go through all the specs and functions, but it puts out about 5 watts (give or take) and covers 80/60/40/30/20m. It supports CW/LSB/USB/FM/AM, and you can set it up for digital modes, too. 

There are three controls (two push-buttons and a rotary encoder), and they each have multiple functions. So, it’ll take some practice getting this old dog used to the menus and functions. 

I set it up on the bench to fire it up for the first time. I connected it to my Elecraft T1 tuner, which was connected to my rainspout antenna. During this initial session, I logged contacts on 40, 30, and 20M. One of those was a very nice chat on 30M with a fellow SKCC member up in Massachusetts. This little rig held up well in my noisy environment.

Hopefully, I’ll be able to take the (tr)uSDX out in the field over the weekend and give it a whirl. 

73, Craig WB3GCK

Evolve III Maestro E-Book

You’ve most likely heard hams talking about the Evolve III laptop over the past few months. I had been hearing about these little laptops being snapped up at prices as low as $60. Several ARES-RACES colleagues have been happy with them, and there’s even one running 24 x 7 as a VARA FM digipeater in our Emergency Operations Center. So, I had to buy one and judge for myself.

So, what is attracting hams to this laptop? Of course the low price is attractive to frugal hams. It’s also small (11.6-inch display) and light, making it useful for portable operation. Speaking of portable operations, you can charge the Evolve III from a 12-volt DC source. Out in the field, you can charge this laptop from the same type of 12-volt battery used to power your rig. 

Evolve III Maestro E-Book
Evolve III Maestro E-Book

Despite its low cost and small size, it’s a capable little machine. It runs the Windows 10 Pro Education operating system, and has two USB ports and a micro SD memory card slot. A 1.1 GHz Celeron processor runs the laptop, and it has 4 GB of RAM and 64 GB of data storage. 

Micro Center stores have been selling them for $59.99 with a limit of five per customer. When I checked my local store, they were out of stock, so I bought one on Amazon for about $89. (Still a bargain, I think.) These laptops are obviously clearance items, since the Evolve website shows newer models running Window 11.

My plan for this little laptop is to use it for logging during QRP-portable operations, especially Field Day and Winter Field Day. I also want to use it for digital communications during ARES-RACES exercises and deployments. 

Getting started with the Evolve III was the same as any other Windows 10 device I’ve owned. The initial Windows setup didn’t take long, and I was ready to install some software. I started by installing the software I use for logging, e.g., N3FJP ACLog, SKCC logger, HamRS, N3FJP Field Day Logger, etc. Everything ran without issues. 

Next I installed the software I need for ARES-RACES. First up was Winlink Express, along with VaraFM and SoundModem. Then, I installed the Narrowband Emergency Messaging System (NBEMS) software, i.e., fldigi, flmsg, and flamp. Over the past two weeks, I’ve been making solid connections to a local Winlink node on 2M using VARA FM. The NBEMS software has also been working great during our local ARES-RACES digital nets.

After using the Evolve III daily for the past few weeks, I really like it. The keyboard has a good feel to it, and the display looks good. I used it outdoors in the shade and the display was still readable. You might need to crank up the brightness, though. 

Is it the fastest laptop? No way. Is it fast enough? Absolutely. I’ve heard of hams running FT8 on these things with no issues. You would think the 64GB of storage would be a limitation. However, after installing the ham radio applications I use, I still had about 24GB left. Just in case, I took advantage of the Micro SD card slot and added an extra 128 GB of storage.

I’m really impressed with the battery life. Depending on what I’m doing, I get more than eight hours of operation on a charge. 

Lately, it seems like my house is where computers go to die. I’ve had a laptop and a desktop go belly-up in recent months. Given what I paid for the Evolve III, if it dies, I won’t feel a tremendous loss. 

73, Craig WB3GCK

Giving My Rig the Royal Treatment

Over the years I have accumulated a stash of the bags that Crown Royal whiskey comes in. I don’t drink much hard liquor myself, but I have a relative who enjoys a nip now and then. She knows I have a thing for bags and containers, so she passes them along to me. I graciously accept them, figuring someday I’ll find a good use for them. 

When I take my Penntek TR-35 on the road, I use a repurposed insulated lunch box to carry the radio, an Elecraft T1 tuner, along with a variety of accessories. Pending a better solution to protect the TR-35 from bouncing around, I wrap some bubble wrap around it before placing it in the box.  Decidedly low-tech, but effective.

The Crown Royal bag, along with my TR-35 transceiver
The Crown Royal bag, along with my TR-35 transceiver

The lunch box works great, but it’s a little bulky for my sling pack. So, for hiking, I usually pack the TR-35 loose in the pack, with a rubber band around the bubble wrap. 

The bubble-wrapped TR-35 going in the bag
The bubble-wrapped TR-35 going in the bag

I found that a Crown Royal bag provides a more elegant solution for packing the TR-35 (or other small QRP rig). I just wrap the bubble wrap around the radio and place it in the bag. There’s no longer a need for the rubber band. Plus, there’s enough room in the bag to accommodate the T1 tuner. 

The Crown Royal bag with my TR-35 tucked away inside
The Crown Royal bag with my TR-35 tucked away inside

These bags don’t offer any real protection from the weather, but they look cool. My collection of bags includes a variety of colors, so I can change them to match my mood (just kidding—let’s not get carried away here).

So, there’s a crazy little hack for you to ponder. If you’re a Crown Royal drinker, save the bags. Your radio just might fit in there.

Bottoms up!

73, Craig WB3GCK

Father’s Day with a New Rig

I needed another rig like I needed a hole in the head, but I couldn’t resist. I’ve had my eye on the Penntek TR-35 for a while now, so I finally pulled the trigger and ordered one. I considered it a Father’s Day present to myself. Two days later, I had the TR-35 in my hands.

Lacking the patience and the close-up vision for serious kit building these days, I ordered a factory-built radio with the rotary encoder tuning option. Now, I have seen plenty of pictures and videos of the TR-35, but the small size of this rig really struck me when I opened the box. Its footprint is not much larger than a QSL card. It’s a perfect size for portable operating.

Here are some features that drew me to the TR-35:

  • It covers the bands I use most in the field (40/30/20/17)
  • Built-in iambic mode B keyer (my mode of choice)
  • Two CW memories. Perfect for POTA activations, QRP contests, etc.
  • Separate inputs for paddle and straight key. I sometimes get calls from fellow SKCC members, so it’s convenient to switch instantly to a straight key for those QSOs.
  • No complicated menu structures to navigate to get things set up. The TR-35 is super-simple to operate, and that’s just how I like it. 

The TR-35 doesn’t include a built-in tuner. No worries; I’m going to dust off my little Elecraft T1 ATU and show it some love. An SWR indicator would have been a nice feature to have, but I can get along fine without it. 

Taking It For a Spin

I didn’t have a chance to put my new TR-35 on the air until today. I drove over to Valley Forge National Historical Park (K-0761 and KFF-0761) to try the new rig on a POTA activation. Doing an activation with a radio you’ve never used is a little like going camping with a tent you’ve never set up before. But, what the heck, I was a risk-taker today. Actually, I brought a backup rig along, but I never needed it. 

I set up the TR-35 in the cab of my truck, along with my T1 tuner. The antenna was my homebrew 19-foot vertical on the back of the truck. As soon as I powered up, I was greeted by lots of loud CW signals. That’s a good sign. I quickly programmed a “CQ POTA” message into one of the two CW memories and got on the air.

My TR-35 on its first POTA activation at Valley Forge National Historical Park. My Elecraft T1 tuner is on the right. It was nice to have paddles and a straight key connected simultaneously.
My TR-35 on its first POTA activation at Valley Forge National Historical Park. My Elecraft T1 tuner is on the right. It was nice to have paddles and a straight key connected simultaneously.

One of the first things I noticed is how loud the audio is. I was using earbuds, and I had to turn the volume almost all the way down. The sidetone seemed a bit loud for my liking, but not really much of a problem for me.

Once I got going, I had a lot of fun with this little rig. I easily made contacts on each of the four bands (40/30/20/17). The TR-35 is a joy to operate, and I really appreciate its simplicity. Tuning with the optional rotary encoder is smooth as silk.

After about an hour and a half, I had 24 contacts in the log, with five park-to-park QSOs. My stomach reminded me it was lunchtime, so I packed up and headed home. I left the park feeling very happy about my recent purchase. The TR-35 is going to see a lot of use in the field.

Happy Father’s Day to all the dads out there.

73, Craig WB3GCK

The Raddy RF760 Shortwave Radio

A while back, I purchased the Raddy RF750 Multimedia Music Player and did a blog post reviewing that remarkable little radio. The folks at Radioddity reached out to me recently to see if I would be interested in taking a look at their latest offering. A week or so later, I received the Raddy RF760

[Disclaimer:  In the interest of full disclosure, this radio was sent to me free of charge to evaluate and review. This was with the understanding that I would write an honest and unbiased review.]

What It Is

The seller refers to the RF760 as a “full-band radio”. That’s an apt description, since it covers everything from the AM broadcast band up through the UHF range.

Raddy RF760 Portable shortwave Receiver
Raddy RF760 Portable shortwave Receiver

Here are the specs from the iraddy.com website:

  • FM 1: 64.0-108MHZ
  • FM 2: 76.0-108MHZ
  • FM 3: 87.5-108MHZ
  • AM: 520-1710KHZ
  • SW: 2.00-30.00MHZ
  • CB: 25.00-28.00MHZ
  • AIR: 118.00-138.00MHZ
  • VHF UHF: 20.000-520MHZ
  • VHF: 30.00-223.00MHZ
  • VHF: 144.00-148.00MHZ
  • VHF: 156.025-163.275MHZ
  • UHF: 430.00-520.00MHZ
  • WX: 162.400-162.550MHZ
  • Product dimensions: 4.37 x 2.36 x 0.79’’ / 11.1 x 6 x 2CM
  • Lithium battery: BL5C 1000mAH 3.7v 3.8WH
  • Loudspeaker: Ф40MM 8Ω 1W
  • Headphone output: 3.5MM stereo input
  • External antenna hole: 3.5MM
  • Storage Capacity:700 stations in total(FM: 100, MW: 100, SW: 100, AIR: 100, CB: 100, VHF/UHF: 100, UBD: 100)

With the battery installed, the RF760 weighed in at a mere 3.8 ounces (108 grams) on my kitchen scale.

The box includes:

  • RF760 radio
  • 1000MAH 3.7V Lithium battery
  • Earbuds
  • USB-C cable for charging
  • External antenna wire (approx. 10 feet)
  • Wrist strap
  • Storage pouch
  • User manual

RF760 vs RF750

It’s clear from the specifications that the RF760 is not an upgraded RF750. The RF750, with its Bluetooth and ability to play MP3 files, is more of a multimedia player. The RF760 does not have those capabilities, but, rather, provides expanded frequency coverage.

The Raddy RF760 (left) and the Raddy RF750
The Raddy RF760 (left) and the Raddy RF750

In my view, the RF760 is aimed more towards shortwave listeners and scanning enthusiasts. It includes features like selectable bandwidths, selectable demodulation modes on certain bands (AM/USB/LSB/NFM), and adjustable squelch. 

The RF760 also includes a headphone jack (earbuds included) and a connection for an external wire antenna. These features are lacking on the RF750. The RF760 also has a digital display, which the RF750 does not. Both radios are charged via a USB-C connector. 

The RF760’s additional features come with a higher price tag. As of this writing, it was selling for $99.99 USD

My Impressions

The RF760 is one small radio. It’s roughly about the size of an Altoids tin and weighs next to nothing. (It weighs about 0.65 ounces less than the RF750.) You can fit the RF760 in a shirt pocket, and you might even forget that it’s in there. 

There’s a lot going on with the RF760. Even with the power off, a press of any button will light up the display showing time and temperature. Oh yeah, did I mention this thing even has a built-in thermometer? It even includes an alarm clock and a sleep timer. If you can think of a function, the RF760 probably has it. 

The user manual does a decent job of covering the myriad of features in this radio. The small size of the printed manual, however, is a little tough on my old eyes. Fortunately, the Raddy website has a PDF version of the manual for downloading. The softcopy manual allows me to search for specific functions, which is handy. I also stored a copy on my cell phone, so I always have it available. As is typical of manuals for Chinese products, some of the wording is not always clear. For example, a section covering how to delete a station that has been saved to memory is titled “Delete the radio.”

The various configuration options (e.g., bandwidth, demodulation mode, tuning increments) vary according to the band you are on. Once you get the hang of it, navigating through the options and selecting specific values becomes an easy task. 

In the FM mode, the sound quality is reasonably good, considering the RF760’s diminutive size. In all honesty though, I think the RF760’s audio lacks the richness and fullness of the RF750. When using the included earbuds, however, the RF760’s audio is greatly improved. On FM, make sure you have the radio set for the proper de-emphasis (75 microseconds here in the U.S.).

The weather alert function is one of the more important features for me, and I had the opportunity to give it a “real world” test. My area was under a tornado watch, and we had multiple severe thunderstorm warnings. While tuned to the weather band, a long press of the “SET” button places the radio in the “SCAN” mode. When NOAA issues an alert, the radio comes on with a brief tone followed by the weather station’s audio. There’s no loud siren like the RF750 has, but that’s fine with me. After an alert, you need to long-press the “SET” button to go back into the “SCAN” mode. During the storms, the RF760’s weather alert function worked flawlessly, going off three or four times. 

Tuning is interesting in that it uses a combination of two methods: up/down tuning buttons on the front panel and a rotary “shuttle tuning” knob on the right side of the radio. You can select the tuning increments for the buttons, which is helpful. You can also select the digit of the displayed frequency that is adjusted by the rotary knob. Now, I’m an old “knob spinner” from way back, so I’m generally not a big fan of using buttons for tuning. However, once you get the hang of using the shuttle tuning knob, you can tune to a specific frequency quickly. You can also scan the selected band by long-pressing the “up” or “down” tuning buttons.

There’s a lot of information shown on the display panel. On such a small radio, though, I find a few of the smaller items hard to read with my old eyes. Fortunately, these are items that I don’t have to deal with often. You folks with better eyes probably won’t have a problem. 

I haven’t done any formal measurements on battery life, but you should be able to go for days before recharging. The USB-C charging port is handy; I can charge the radio with the same chargers I use for my phone. 

Bottom Line

The RF760 is a small, lightweight, and feature-packed radio. For camping or in my emergency go-kit, I’d go with the versatility of the RF760. It’s like the Swiss Army knife of radios. I especially like how the NOAA weather alert feature is implemented on this radio. However, If I want to listen to music while working around the house, I’d go with the RF750 and it’s superior audio. 

73, Craig WB3GCK

The Raddy RF750 Multimedia Music Player

My (far) better half and I like to keep a radio in our little travel trailer. When we’re camping, we often listen to baseball games in the evening (go Phillies!) while sitting around the campfire. It’s also handy to have a weather radio on hand, when the cell service is unreliable or non-existent. I bought this little radio to see how it compares to the old radio we’ve been using for years.

The Raddy RF750 is sold by the folks at Radioddity. When I went out to their website to buy one, it was showing “sold out.” They had some in stock, however, on Amazon, so I placed my order there. The same radio is also available at a lower price from Chinese sellers branded as the HanRongDa HRD-700. Being the impatient sort, I went with Amazon Prime at a slightly higher price than the $34.99 price tag on the Radioddity website. (When I checked a few days after receiving my radio, Amazon was showing it as “currently unavailable,” and Radioddity was still “sold out” in the U.S. These things must be selling like hotcakes.)

The Raddy RF750 from Radioddity
The Raddy RF750 from Radioddity

What It Is

The Raddy RF750 is a compact multimedia player with a radio that covers the AM, FM, shortwave, and the NOAA weather bands. It has a Bluetooth mode, so it will play audio from your smartphone. The RF750 will also play MP3 files from a micro SD memory card (up to 256GB) you can insert into the unit. It’s powered by a 1000mah Li-ion battery, which you can recharge via a USB-C port on the radio. 

When playing audio via Bluetooth or SD card, the RF750 has an audio equalizer with six preset configurations to choose from. You can also set the radio to scan a band automatically and store the stations it finds (up to 20 stations each on FM and AM, 10 stations on each of 7 shortwave bands). This can be useful when you’re traveling. There is also a sleep timer that will shut off the radio after a user-selected time (10 to 70 minutes).

Here are the specifications from the Radioddity website:

FM: 87.5-108MHz
AM: 520-1720KHz
SW: 5.7-17.9MHz
WB: 162.400-162.550MHz
Memory: Support TF card, Max 256GB
Audio format: AV, WMA
Power supply: replaceable 3.7V 1000mAh BL-5C lithium battery included
Charging: DC 5V, Micro USB-C interface
Size: 3.5″ x 2.4″ x 1.5″
Weight: 0.22lbs

My Impressions

When I first unboxed this thing, the first thing that struck me was the small size. The descriptor, “compact,” is an understatement. It’s smaller than an Altoids tin and just a bit thicker. Weighing in at less than 4 ounces, it won’t add much weight to your go-kit or backpack.

Along with the radio, the box included the Li-ion battery, USB charging cable, wrist strap, a rubberized drawstring storage pouch, and a user manual. The battery was easy to install and charge up.

I powered it up and tuned to a local FM station. Frankly, I was blown away by the sound coming out of this little radio. Apparently, it uses DSP filtering to provide that sound clarity. Given the radio’s small size, tuning can be a little touchy for an old guy with clumsy fingers. Fortunately, there’s a tuning indicator that makes it easy for me to lock in on a station.

I was particularly interested in the weather band capabilities. In addition to covering the 7 NOAA weather channels, the RF750 also includes a weather alert function. In this mode, the audio is silenced, and the radio appears to be scanning the 7 weather channels. I haven’t been able to test this out yet, but I plan to see what happens during NOAA’s next weekly test.

[Update: I set up the RF750 in the “Alert” mode for the NOAA weekly weather radio test, and the RF75o’s alert went off as expected. The only issue is that the siren sound it makes is excruciatingly loud. On a positive note, when a weather emergency happens, you will definitey know about it!]

When I tested the Bluetooth mode, it paired easily with my smartphone. Although my phone’s audio played through the RF750 was nice and clear, I don’t see myself using this function much. 

To test the “Music Player” mode, I copied a few MP3 files to a 2GB micro SD card, which I inserted into the RF750. The sound quality coming out of the tiny speaker really impressed me. I plan to load more of my music collection onto a larger memory card, which I’ll leave installed in the RF750.

I was a little surprised that the RF750 doesn’t include an earphone jack. I would have expected one on a portable radio like this.

The user manual provided is typical of low-cost Chinese products. The English isn’t always clear, but it was enough for me to figure out how to use the various functions.

I have to say, I’m impressed with this little unit and all the features packed into it. It will be a handy item to have around, especially while camping or during emergencies. In fact, during a recent snowstorm, we lost power for a while. The RF750 allowed us to check the local NOAA weather forecast, listen to local news on the AM band, and enjoy some music on FM.

Disclaimer: I have no financial interest in this product. I purchased it with my own funds, and I’m merely a satisfied customer.

73, Craig WB3GCK