开云体育

For those who don't get the joke... -- Dale Hardin 24750 State St. Unit 487 Elberta, AL 36530 251-597-9256

I did the same thing in the late 70s with a fone company toroid and a cap. Made for one sharp CW filter. I just recently removed it from my 75A-4 receiver, didn't work that well anymore, the cap was

Thanks Peter! Beside all the TX circuitry, the relay is also driving two other relay coils, so I wonder if that may cause a bit of stress too?? Initial resistance of the relay coils in parallel might

Looks good Joe KD2NFC

Too funny!

For USB/LSB on the uBITX, what is a reasonable carrier suppression?? (and how is that properly measured, i.e. I assume it's carrier relative to peak?) Background:? I should have left well enough

But, where will you mount the transceiver on the filter board?

Yes, those were popular back in the day for home-brew projects. Many folks built RTTY demodulators with them. Tom, wb6b

You can put in an op amp analog filter for very small outlay of cash. I can remember building my first audio filter in the dark ages around 1973. Used toroids probably surplus from the phone company

Yes I was hoping to steal someones design and spend less than 10 dollars. Have to agree that adding a 300 dollar filter to a radio that I bought used for 45 dollars is not going to happen.

A stuck relay that releases on being tapped usually indicates that (some of) the contacts themselves are sticking together, presumably from arcing. The only real cure with these small sealed units is

[Image] [Image] Hi everyone Installed a separate PS and updated the display software. Very pleased with the results. I also have a higher output regulator coming so the step down PS is only temporary.

Different use case, IMO. I have a NanoVNA, and it's great for measuring passive devices' S11 & S21 parameters, but for signal measurement (spectral purity, power level) it is useless. This is why I

K1 is the Transmitt/Recieve relay. It was sticking in my v4 -- John Faivre?WA9SGD

I had the same issue. I replaced K1 with the axicom and it fixed it.i only run about 15 watts on 80 meters, but I was switching inductance on my ant tuner often while in transmit. I think that may

WOW! that Wolfwave filter cost upwards of $300 USD!!! My digital filter does everything it does and more (including a color display)... and was less than $50...

I believe this is where the Wolfwave comes in. It is a complete enclosure and GUI with the sotabeams DSP board at its core. A tad pricey but it does everything - including regenerating clean CW from a

Don 28 watts on 80m?? most of us are around 10 watts - could be an inaccurate power meter - or if you really are doing 20-some watts you could be over-driving badly. notice I am suspicious that relay

I have a bunch. I can mail you a couple.

I'm glad you found the answer. I looked at the schematic trying to make a suggestion on what to check but I have no experience with the ubitx. There has been quite a few Cobra mikes used over the last