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Thought this was going to be about a different subject. Several amps I have here (in particular, the L7 and L75) can benefit by having their bias circuitry revamped slightly. There was an EU seller of a kit which also incorporated meter protection and a few other nice-to-haves onto the same...

I have one on the bookshelf right next to the the display I'm viewing this post with. It featured a single-tube 3CX800A7 HF amp project and possibly a 6M one as well. Low drive - around 20w in for 700 out.

I'm not sure what benefits you'd gain from this particular design, unless your transceiver incorporates TX En/TX Out control lines (like certain Ten Tecs did). The key line of a QSK amp (e.g., 420 Hercules) was connected in series with the TX Out port and another line ran back from the amp to...

I'd probably go with one of these instead: https://sdrswitch.com/products/sdr-switch-0-70-rxin-rxout

In search of a TM-321A/331A and TM-521A/531A. Let me know what you have via PM. Thanks!

I run both the MX-S3 and the earlier version (MX-S1) in my shack. The IC-7200/R-75 pair sitting next to me has an S1 attached. Key differences: S1 allowed for switching the transceiver audio (when off or in TX) on the SDR audio (when on, in RX). S3 has several PTT line connections - two of...

Be interesting to see if a tilt-over mount (say, for a camper) might be utilized. We're thinking about picking a 20ish footer up at some point and I can see doing a lot of POTA activations when camping. This would be a little more manageable solution than the 6BTV I was thinking about using...

Stoner Pro-40 enters the chat. Is the big knob a clarifier or a limited-range VFO? Ten-Tec, Collins, Icom and Yaesu must have borrowed from that concept. KWM-380, Omni V/VI/Paragon, IC-7200, FT-980 (among many others) don't have a dedicated RIT (Receiver Incremental Tuning) knob. Instead, you...

Somewhere in a project box I have an LCB-8. DOA. Need to fix it. The same venue where I purchased that rig often features the odd LCBS-8. I may or may not grab a non-hacked-up one at some point,

Most of the antenna selectors I use are either built into the tuners or are remote. Case in point with the latter: A Drake CS-7. In my case, the remote unit is used to select a multi-band sloper from one of 5. It shorts the feedlines of the unselected ones, effectively turning them into...

In terms of survival, look at it along the lines of the way our Air Force trains our fighter pilots: Speed is Life. The more things you have to slow you down and/or the more you have to defend, the greater the chances you're gonna get got. If it's just a matter of the power going out and...

AI is good at some things - if it's trained against a large enough set of data. What is cannot effectively do at this point is both think and innovate. Had this very discussion with an engineering team prior to posting my reply. We're a ways out yet.

Any tool - be it a hammer, a gun, or AI - can be used correctly...or horribly misused. Unfortunately, power corrupts. In the right applications, AI can be of great benefit to mankind. There are those who will use it for nefarious purposes, however. Society must be ever vigilant against such...

Throwing my 2 cents in: I have a 160-10M fan-loaded dipole combo up as my main HF wire antenna. It's set up as an inverted vee at the moment with the apex around 50 feet. Planning on going 20ft higher when that tower goes up. At quadrature to it will be placed a fan-loaded dipole for...

I replied elsewhere on this topic, but: The base on mine is about 26ft up. It will be around 50 when I get that particular tower installed, Three tuned radials are used...per band. That's the secret sauce. They're cut for 21.25, 24.95, 27.2 and 28.5MHz, Three bundles of 4, and each is sloped...

Back in the day, the bottom 25KHz of the bands was where the good DX hung out. If multipliers mattered, you went where you could find them. Old habits die hard, especially when the rest of the world still operates a given way.

Run over yonder - to the Boat Anchors section of another forum - and look up KW4H. He has a solution to your dilemma and used it to restore the Heathkit CW Twins, amongst a few others. I threw out the idea of using such as a fixed-frequency signal source in rigs such as the FR-101...

This thread is relevant to my interests. Good on OP for keeping another 440S alive and out of the parts bin. I have two of these. One apparently an early model and another, a later. There are differences in at least two of the boards (RF Unit and one of the Switch Units on the front chassis...

My use case may be different than others, but here's the setup: Base of mine is ~30ft up - looking to increase to 50ft at some point. Coaxial choke at the feedpoint and another (unun) choke at the tuner output. Three tuned 1/4w radials per band - 21.25, 24.940, 27.2 and 28.6MHz are the...

If they offered this in a remote-head version (a la IC-703/706/7000, FTM10R/SR) I'd jump on at least one for use with my touring and sport touring motorcycles. There's an ongoing 10M net in my area which I participate in when mobile - and it would be nice to be able to pop down to Ch19 and...