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The cliche that "heat rises" refers only to heated air. Heat in solid materials moves in any direction that is lower in temperature. Heat in radiant form (long and shortwave IR) moves in whatever

external vfos for HF rigs..at that time I was thinking the same thing. Hams are kinda spoiled with stability right out of the box now days. And if it's not stable enough for 129.00 you can add

Heat rises, the stuff that gets hot are already on the top of the board.

I'm really not sure. Could be as simple as a bad solder connection in the original? L4 had been pushed around quite a bit during shipping it was 90 degrees twisted. Stay capacitance to the

Hello, It was sent last week. This week should arrive in the customs of BR. 73 PY2ADX - Antonio 2016-12-12 5:38 GMT-02:00 geocrasher@... [BITX20] < BITX20@...>:

Hello all, I have a Bitx 20 on the way. It is the through-hole version. I intend to use a DDS for the VFO. If I want to eventually modify it for 80m the two things to change are: 1. front-end

Ive used the 10 turn pots ...I have the hendricks version of the Bitx...with good voltage regulation to the varicap diode via the pot and precision low % caps in the oscillator circuit...after 10 min

I have some good news and some bad news regarding my work on the Bitx 40v3. First, the good news. I replaced the four caps that determine the frequency on the VFO, these are c91, c92, c94, c95 with

fixed thankyou :)

Hi http://www.kh-gps.de/uni_vfo.htm http://www.kh-gps.de/uni_vfo.htm this one is working fine, you must change quartz frequency from 27 Mhz to 25 Mhz in the sketch Tom

What OLED, there are so many ..

hi all has anyone got a arduino script for a adafruit si5351 vfo with oled please

Thanks for sharing! Can you explain how soldering L4 under the board instead above would help the drift? As for tuning easier, I built a 20:1 gear reduction drive, but you can also get 10 turn pots

Just have some patience for shipping. It takes some time but is worth the wait :) Ryan KC7RYS

I suspect that some do and some don't. Try measuring your IF and subtracting the VFO. You will have to calibrate it against a known signal, but it should work. The problem is in a negative result ---

Bill, I have several of the Sanjian counters too, and I'm quite happy with them in general. But as others have reported, they do not work with a subtractive offset. The option is there; it simply

This is an LM 386 circuit with a nice PCB and all components for $1.41 - free shipping. I ordered one and it is very nice. From eBay: 1pcs LM386 Super MINI Amplifier Board 3V-12V DIY Kit YG

When I received the BitX( #33) the drift was pretty bad so I installed a DDS, UNO and a NT7S Si5351 board which works like a champ. Today in prep for a presentation at my club later in the week I

Jerry, Where do you connect up the QRPguys counter on the Bitx40 or do you adjust something on the counter to compensate for the offset?? I've built both versions of the counter, so I must be hooking

I've had good luck with the San Jian freq counters.?? I have four of them in the shack.?? I started with 8 digits, but found that the six digit version was fine.? They feature IF offset.?? I