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Raj - after some work tonight, I think I may have this solved.? Yes, when in transmit I do see (on my multimeter, AC setting) around 145mV on the collector of Q6, and see an audio waveform measuring

Did a hail mary and off to china they go. $105 and 2 weeks and we should have some answers....

Very exciting! We are looking forward to the shake down testing outcome. Mike ZL1AXG

I like the SSM2167 for one big reason: Simpler package. While QFN is easy to do in a mass-production environment and I've never even had a problem with my hot air station, I hate QFN's/ TDFN' (Tiny

The birdie at 7.2mhz is due to the 5'th harmonic of the vfo at 5*(12-7.2)=24mhz beating with the 2'ed harmonic of the bfo at 2*12=24mhz. Allard's v2 firmware drives the BFO from the si5351, so can

Here are two photos of my uBITX in the Excellway plastic cabinet. Still more work to do but this is what I have so far. I found some small clear stick-on labels at Michael's craft store and stuck them

Ashhar, I'm having trouble with the good 'ole birdie at 7.199 mhz on my home brew bitx40 designed radio. I had the same problem with the hf sig board but was able to get rid of it by placing a tuned

Check if you get 100-200mV audio at the collector of Q6. Raj

Also make sure you didn't unplug something when you pulled the cover off. Vince.

It can't be anything blown up. Can you measure how much is the current draw on receive? It should be around 150 ma. That is an indicator that things are alright. - f

OK, it increases, but not by much. I ran an LTSpice simulation of the Bitx40 final, see a 50% rise in peak voltages when the antenna goes open circuit. Not something I had ever though much about.

Oops:? After completing my build in a metal cookie box,? transmit was fine with 5 watts to dummy load on 40 meters.? Receive had good rf noise, lots of birdies, but no real signals except for some

If the LPF is presented a high impedance load (such as a broken antenna connector) the voltages will go up. Though not as high as the 3000 ohm example suggested, the IRF510 cannot send 10 Watts into

Hans, My calculations were for an L network that matches high impedance loads, not for LPFs that have low impedance on both sides (like the qrp labs LPFs). Btw, folks, the qrp labs labs use very high

Hi, It's been a while since I got that part working, and I may have done something weird or mistaken and forgotten about it.? Tomorrow morning I'll double-check the pins again with a voltmeter to

Hi David, No reason the teensy couldn't be put on headers. If I end up selling this particular PCB, the kit form would be SMT pre-done, all the through-hole to be done by the end user (Which isn't a

Xcott, interesting about the non-inverted RTS signal. For myself (and some others), I found that WSJT-X will pull RTS (or DTR) to ground when PTT is triggered. FLdigi has an option for "RTS +V" to

Hi, I didn't invert anything.? I'm using WSJT-X, and I just set it to use the RTS pin for PTT.?? The RTS pin goes high on transmit, and it ties my uBITX PTT line to ground. Gordon, thanks for the

Congratulations that you got it to work. The cost of the USB to RS 232 converter and related trouble convinced me to add the necessary hardware to do diodde detection. We also added trim pots to set

Are you related to the family of the same name from Malcolm rd in Jamacia Plain? (Boston) Ma. Bill Schmidt from there was a WWII vet and neighbor of my Grandmother. Had to ask! Steve kb1chu PS I'm