Interesting, it would have been better if they were given a slice of 40 meters. The upper end is mostly empty, the dx is better. - f

that would be at the output of the audio pre-amp or the hot end of the volume control. You could feed bias the A7 and couple the audio to A7. With some gee-whiz coding you could get a very accurate S

there is no need for a further conversion. you can directly program the first oscillator to work at 146 Mhz - 45 Mhz = 101 Mhz. replace the front-end mixer by an ADE-1 mixer. a new front-end of a band

There was an arrl review that was quite objective. - f

quiet severe!

there are some creaky bones like us who are stull puffing the ol bitx20. this way before this city came up here. we'd hunt 'em nylon tap washers and cook 20 meters on nights of 2009 cycle. - f

#bitx20help #bitx20

fantastic! i have read the very early proofs, this book is going to get a number of people off youtube and onto arduino ide! - f

Check the pinout on hfsignals.com. the tip is audio, the ring is ptt and the shield is ground. We followed this so that regular audio cables can be directly used between a pc and the speaker/mic of ub

Dave, Whats defective? Please write ton sales@.... note that this group is a tech support group, independent of hf signals. We can help you find out what is wrong and fix it. - f

It seems to me that almost every one jumps into calibration. Dont Do That! It comes precalibrated. But once you have fiddled with it the config menu, then you are in the weeds if you dont know your wa

Gang, I have recorded a video on how to build feedback amplifiers. It is little long. Do take a look if you are into homebrewing. I explain what a feedback amplifier is, how to choose the component va

You dont have enough attenuation for proper measurement. The fundamental as fed into the spectrum analyser should be -30bdm. Which would indicate about 70 db of attenuation. Stronger signals can easil

Well, it is an early release i usually take a few weks between me and raj to sort out thr bugs. Im this case, i was making incremental tweaks for sometime and then i realized that the software was sta

Yes, i meant the A7.

I have been using thr Antuino exclusively as my main instrument for two weeks now. In the process, I have had to rewrite the entire firmware to make it more usable. I have uploaded the new code. I onl

It could be lack of shielding on the two meter rig too. We have swept the output of ubitx, there are very very small spurs at 2 meters. Indeed, it would be a wonderful surprise to find the venerable I

The BFO is pretuned from the factory. you don't HAVE to do it. This is a myth. It works out of the box for almost everyone. Many think that they need to do it and they mess it up. It will take you abo

heatsink? i was complaining about the antuino. it doesn't have a heatsink.

Hans and the group, This is going to be fun. Today, I was fooling around with the Antuino and suddenly, it wouldn't read the return loss. I checked the driving signal. It was on, but off by about 200

Congratulations!