开云体育

Actually I’ve been doing a lot of experimentation on flattening/ linearizing the transmit chain. The parts I’ve fallen on are the NE46134’s. They have plenty of gain, Ft of 5 GHz, and with the

Hi All. Hows this look: 73 Nick VK4PP

Those points need series inductive(lossy ferrite) and/or resitive isolation as the caps have ESR and however low if you present RF from the power supply side its not sufficiently effective. Of course

On Thu, Aug 30, 2018 at 02:56 PM, Kees T wrote: All of the WA2EBY derived dual MOSFET Amp designs I've seen (IRF510, RD16HHF1, RD15HHF1) have a "compensation capacitor" across the output transformer

Today I got the Si5351 running, so all the subsystems (LCD, encoder, Si5351) are now operational. Next step is to try to build stock uBitX code on the new platform.

Nice one Joel! 73 Ken VA3ABN

JC? Keep that Bitx17A .. it seems there will not be many more kits made. BTW if you can get the 9 turn fine tuning air variable? out of an old UHF TV receiver ( typically can be made to tune

......and the "compensation capacitor", since it's across RF voltages, should be a 500V Mica in the 47pF to 150pF range. 73 Kees K5BCQ

I worked a station in Antartica from my QTH in Oregon, a distance of 10,455 miles, on a Bitx17A running 8 watts into a EFHW antenna. I have the QSL card to prove it! Joel N6ALT

Thanks, Iz Oos!? Just to be sure I'm not missing something subtle, why not just use WWV?? It is AM, isn't it?? And I know for sure that it is on 10.000000 MHz which is more than I can say for AM

.....and I would still parallel a 1nF-10nF capacitor across the existing 100nF DC bypass capacitors....including the 2 MOSFET bias voltage bypass capacitors. 73 Kees K5BCQ

---------------------------------------------------------- Thank you very much dear Art this is a great help for me . ----------------------------------------------------------

Allison, All of the WA2EBY derived dual MOSFET Amp designs I've seen (IRF510, RD16HHF1, RD15HHF1) have a "compensation capacitor" across the output transformer primary.? Used to balance the 3-30MHz

Can anyone send me a pic of uBITX manager with the loaded information for a ver 3. The uBITX is loaded with 1.097 and the display is loaded. I’m unfamiliar with the information process. I have

Also check the ground connections of the BitX40 main board and the Raduino. General rule: All ground wires shall be connected to ONE central ground point ("star" configuration). There should be NO

Hi Gary, Perhaps there is a problem with your PTT_sense line. The CW options in the SETTINGS menu are only available when the PTT_sense mod is installed. Double-check the PTT-sense wiring and resistor

It seems out of calibration. To be sure follow the hint of using AM broadcasts on shortwave. They are exactly on the frequency they are supposed to be. You can use either LSB or USB and tune exactly

John, Nikos Worked on page px 11 and 0 – not everything is correct but is about 90 percent. ATT and IFS don’t function correctly yet. Could be some others. I will stopped for today. Nikos I guess

Garbage in, garbage out. And when fabbing PC boards, you really don't want garbage. This world has way to many coffee mug coasters already. . A local software tool such as Gerbv or GerbView will allow