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Alternatively, and less invasive ...Ammeter in line with unit ..turn on recieve approx 160 ma..key down, no tone approx 340 ma...adjust rv2 to 440..rv3 540 ...done Jim

RV1 set for 10-12W out on 80M after setting bias on RV2,3. Setting bias for the finals.? you require a milliamp meter in the range of 500-600ma maximum. Break the connection for the BROWN (middle

It is *very* difficult to tell if the top of the waveform is actually flat-topped or not. By the time it becomes obvious you are probably already flat-topping. No it isn't.? You start with lower

Warren, Jerry, It does look like what I've seen.? I belive the bigger picture is that rf from the amp is getting into the 45mhz IF and back to the mixer for a multiple times around loop. Part of the

Warren, Interesting that your signal analyzer plot shows some spurs knocked down considerably? relative to the carrier, some not. I'd guess those spurs that got knocked down are indeed due to

When you access the TSW webpage, use the full URL http://www.w0eb.com and you might want to clear your browser's cache as well because we change the page and file listings frequently.? Unless you

unassembled ubitx v3 kit with factory socketed tda2822 (non WX branded) with all the components it originally came with. opened container to inspect components and haven't gotten to building it, too

Hello! Is there a geramn bitx group somewhere? 73, Stephan DC8LZ QTH JN37XX

Jim, A two-tone test on an oscilloscope requires a subjective assessment of the shape of the resultant waveform in order to determine if you are generating splatter. It is *very* difficult to tell if

Thank you! I was just looking at your web page yesterday and wondering about getting the sources.? Ralph

While waiting for my filters to arrive from eBay I decided see what effect would result from replacing R27 with a variable attenuator. I attached two short lengths of miniature coax, one the each end

Both filter are identical as I cannibalized one from another uBitv3 for now. In my case the reduced power is slight on 80/40/15/10 but for some reason 20 dropped. Something on 20 is behaving odd, when

I found a Chinese supplier 45MHz filter supplier here https://www.alibaba.com/product-detail/45MHz-2-Pole-UM-1-Bandpass_60676734055.html?spm=a2700.7724857.normalList.2.4c2b75e8OZx7MS I'll try and

Yes Fabian with 'finals' I mean the power amplifier transistors, the IRF510. My UBitx had the heatsinks just put on the back of IRF510. If I had used a metal case in place of the heatsink I could not

and in addition duen to the mismatch of the filter (it is high iompedance so acts as an attenuator). BUT: if this is true then the drive Level to the mixer is also reduced thereby redusing the mixer

Link to ebay.ca for any VE hams wanting the filters

Hi, I am really pleased to see the 45 MHz crystal filter solution to the spur problems. I am writing up a MicroBitX article for our club - Michigan QRP Club - and this is a welcome last minute edit of

Hi Glenn It is not difficult to program a second (or third etc) firmware-emulated I2C port on the microcontroller. The inbuilt I2C/TWI peripheral isn't the only way to do it. I have code examples in

If he does not have? an RF powr meter he can put in a 10 W 50 R non inductive load and add a a two diode RF probe and measure the peak DC on a DVM. There are? passive? RF probe designs all over the