I mentioned in a previous post that I recently did a thorough clean-out of my shack and home office. It took two full days, and kept me out of the field during that time, but I’m very pleased with the results.
After re-arranging my grab-and-go QRP rigs on their dedicated shelf, one rig was very conspicuous: my LnR Precision LD-11.
Thinking back, it has been ages since I used it in the field–possibly more than a couple of years, in fact. As I packed my bags Sunday morning for a multi-day trip to my hometown, I grabbed the little red LD-11 and stuffed it in my main radio bag. It was time to take it to the field!
Lake James State Park (K-2739)
I didn’t have a lot of time to play radio Sunday afternoon, so Lake Jame State Park was a no-brainer. There, I know I have a number of picnic table options, mobile phone service, and it’s a modest detour off of Interstate 40. Low-hanging fruit in my POTA world.
There was snow on the ground Sunday afternoon, but it was 36F/2C so not terribly cold, just damp.
Due to snow melting in the trees, I set up my station in a picnic shelter where things were dry.
Like the FT-817ND and G90, the LD-11 has no memory keying in CW or Phone. Memory keying is such a useful feature for park and summit activations because it frees up your fist and voice while calling CQ or sending 73s. With the LD-11, I’d be doing all of this “old school” which is absolutely fine for a short activation.
On the air
Although my EFT Trail-Friendly antenna should be resonant on 40, 20, and 10 meters, it was not Sunday because I’m almost certain I’ve finally damaged the radiator coil. I’ve deployed this antenna well over 150 times and yanked it out of countless trees when it got stuck. It’s lasted much longer than I would have ever guessed.
When I tried transmitting on 40 meters, I got a high SWR. Instead of replacing the antenna with another one, I simply hooked up the Elecraft T1 ATU and found a match. This is one good reason why you should always pack an antenna tuner. While employing an ATU might not be as efficient as using a resonant antenna, it can save your bacon in a situation like this and will certainly get the job done (especially if your only goal is a valid field activation).
After matching the antenna, I hopped on the 40M band and logged five CW stations in short order. Obviously, the antenna was working “well enough”–!
As I’ve done with a number of my recent activations, I started recording a video at this point. I started it after my first five CW contacts due to a lack of space to record a 60 minute video (this one turned out to be 40 minutes and change).
I then moved up to the 20 meter band where I worked one CW station, then switched modes to SSB where I was surprised to work Jon (TI5JON) in Costa Rica, Steve (WA4TQS) in Texas, and Paul (NL7V) in North Pole, Alaska.
This was one of those rare instances where my QRP SSB signal snagged more distant stations than my QRP CW signal.
I’m certain, however, had I spent more time on 20M CW, I would have logged a number of other distant contacts. Here’s my QSOmap from the activation–not bad for 5 watts into an inefficient antenna:
All-in-all, I was very pleased with the activation. Even though I was making do with a faulty antenna and even though my CW was a little sloppy since I wasn’t quite used to the LD-11 keyer timing, it was so much fun!
I do love the little LD-11 and would certainly recommend grabbing a used one if you find a good deal.
As I mention in the video, the LD-11 is no longer manufactured and it never will be again. The main engineer behind the LD-11, SKY-SDR, and ALT-512–Dobri Hristov (LZ2TU)–passed away in 2020. Dobri was a well-respected fellow and distinguished ham radio operator/DXer. I corresponded with him quite a few times in the past. Sadly, when Dobri passed away, he took the design of all of these rigs with him. His brief period of sickness leading to his death all happened within a year.
So if you find one of these fine transceivers, keep in mind that some internal components (LCD screens, ICs, etc.) might be hard to replace if they fail. These radios are built well, however, so I wouldn’t expect something like that to happen for a very long time.
It was a lot of fun using the LD-11 during this activation and I certainly plan to put it in rotation from now on. Wherever Dobri is now, I like to think he’ll feel those LD-11 signals running through the ether!
Any other LD-11, SKY-SDR, or ALT-512 owners out there? Please comment!
The LD-11 is basically a small, tabletop SDR transceiver. It’s like a miniature, simplified version of the Icom IC-7100 I’ve also been evaluating.
The LD-11 is an all-mode and all-band transceiver–meaning, it includes SSB, CW, CW-R, Digi, AM and FM modes on all amateur radio bands (160 – 10 meters).
Though the LD-11 isn’t advertised as having a general coverage receiver, it will indeed tune the entire HF band.
You do this by entering the LD-11’s administration mode. LNR describes this in the LD-11 product manual, but suggests you contact them for help the first time you do this. In the admin panel, you’ll find functions that allow you to set the band edges on each amateur radio band.
For a preliminary test of broadcast reception, I moved the lower band edge of the 30 meter ham radio band to 8.2 MHz.
After saving the settings and re-starting the LD-11 in normal operation mode, I could then tune the entire 31 meter broadcast band on the LD-11.
Hypothetically, you could either widen each amateur radio band to include adjacent broadcast bands, or you could simply set one of the ham bands to include the entire HF spectrum. To make it easier to navigate and tune through the bands, I’m choosing the former method over the latter.
Since the LD-11 has a proper AM mode, broadcasts sound great–especially via headphones!
Proper AM filters for broadcast reception!
Better yet? The AM filter width can be widened to an impressive 9.6 kHz! Woo hoo!
The LD-11 has four filter slots: F1, F2, F3 and F4.
The F1-F3 slots can be set to a fixed user-defined widths (common widths are default).
F4 can be altered to any available filter width without having to enter the admin mode of the transceiver. Simply press the “F” (blue function button) and the FILTER button simultaneously and use the encoder/tuning knob to specify the filter width in .1 kHz steps. Pressing the F and FILTER button simultaneously again, will save your filter width for the F4 position.
I’ve been using the F4 filter position for widths between about 8.2 and 9.6 kHz in AM.
It’s still early days with the LD-11, but I’m enjoying this little transceiver immensely. It reminds me of one of my favorite QRP transceivers of yesteryear: the Index Labs QRP Plus (though the LD-11 is much smaller, more versatile and has a much better front end than the QRP Plus!).
LNR Precision sold out all of their first run LD-11 units within moments of having announced availability. I’m willing to bet they’ll bring a few LD-11s to the upcoming Dayton Hamvention, though.
LNR Precision announced two new QRP transceivers this weekend: the MTR5B and LD-11.
Below, you can find details I pulled from LNR’s press release and website for both units:
The LD-11 is a new 11-band QRP transceiver based on the LNR’s LD-5 transceiver. The LD-11 covers from the 6 meter band down to the 160 meter band. A new feature on this model is a built-in panadapter. AM/FM/SSB and CW modes are all included.
The new LD-11 is Digital Direct Conversion, SDR type, build-in CPU (SM32a) DSP radio in which RF signals are directly converted to a digital data via differential and balanced A/D converters. This enables direct sampling with extremely low phase and floor noise.
The DSP is unique and features two independent channels. It also employs a unique differential algorithm within the software which is applied for IQ processing of the channels with phase suppression of the unwanted side-band channel.
The balanced ADC and DAC gives additional noise floor reduction and the receiver can handle interfering signals that are 100 dB stronger than the desired signal at a frequency separation of 10 kHz, and is about 130 dB stronger at 50 kHz separation. As the receiver and transmitter are using the same DSP channel, there is no gap between the receiver performance and the transmitter performance. Thus, there is a clean neighborhood on the bands. At the development stage, our intentions were motivated by the TX side-band noise of existing SDR manufacturers, so our aim was to fully equalize our transmitter to have noise performance that is compatible with the best modern receivers, or even better. After a arduous year of development , we think we achieved it!
This 11+ band radio is based on the LD-5, which has proven to be one of the most exciting QRP transceivers introduced in the last few years. Quite frankly, the performance rivals high end units offered by other manufactures at a much lower price point. Our motto is that we make QRP transceivers that you will want to take out in the field (without fear of breaking the bank).
Note: I will review the LD-11 in the coming weeks and post images and notes here on QRPer.com.
The new MTR5B 5-Band Mountain Topper is a fully-assembled 5-band CW transceiver KD1JV designs “Steve Weber” kit. The following are specifications/features from the LNR website:
40M, 30M, 20M, 17M, 15M Size: 4.337″L x 3.153″W x 1.008″T Weight: approx 6.4 OZ.
Switch selected 40/30/20/17/15 meter bands (no band modules to lose or change out)
Wide operating voltage range, 6 to 12 volts 15 ma Rx current at 12V supply
Efficient transmitter. Low current with 4W output
Push button or Optional rotary tuning
24 hour clock built in, with battery back up
Three 63 character programmable message memories
Message beacon mode with adjustable pause time
If you were lucky enough to grab a first production unit of either of these radios, I would love to post your overview/review! I’m looking forward to checking out the LD-11.