Hi, What was the current draw before re-adjustment? That would indicate how far off the bias was (but not how balanced they were). What is an "MJE"?

Hi, Why should there be voltage across R97? Unless the gate on the final is blown, there should be no substantial current flowing through R97. If you didn't turn the bias voltages down to zero before

Hi Ken, I did Alison's changes for the relays on my v3. It might work well for you, as with the relays mounted on the bottom side, their pins all end up on the top side where most of the traces are. I

Hi Laksh, The formula is not meant to be perfect - it only gives approximations. If we all lived in outerspace, with nothing near our antennas, use of a formula could be quite reliable, however our an

Hi, Is it so much more with DHL? In Canada, we are hit with customs duties whether it goes through DHL or through Canada Post. With the latter, they charge an extra processing fee of $10 on top of the

Or half a drop (or less), A full drop is too much for computer fan bearings and will add noise. You just need enough to wet the spindle and not make a puddle. At least in my experience that's what I'v

#v6

Hi, Looking back at Farhan's last EMRD Yahoo group thread, he was using a teflon core at VHF 60MHz for a bandpass filter. This makes sense. But that's a big difference from doing that for inductors at

#bitx20

Hi Gerard, You might want to check the Wiki here for Alison's changes to some of the toroids for more balanced performance. https://groups.io/g/BITX20/wiki/7641 73.

Well, I was looking at a datasheet that had both the 2219 and 2219A listed and there was a difference between the two: https://www.onsemi.com/pub/Collateral/2N2219-D.PDF I usually try to research thin

Link to Wiki page on the topic: uBITX RF Power and Gain Issues

Hi ohwenzelph, Allison's metal 2n2222a transistors should be comparable to 2n2219a transistors, but like always the source of the transistors needs to be researched. If Allison got good results with h

Hi Amie, From ver5 on, I think the rigs are designed to have the 10m LPF in at all times. Since this help with reducing upper harmonics, and there is no harm to leave it on all the time, you might wan

Hi Gerard, The mic, phone, and CW jacks are all for stereo 3.5mm plugs. The mic jack uses the tip connection for audio, the ring for PTT, and the shield for ground. The phone jack wires the tip and ri

Hi guys, Go to the ubitx.net website download section and click on VU3SUA case construction link. This will get you to a page with many pictures you can download to guide you. 73

Hi Mike, I'd be happy to do it if you're still looking. My email at QRZ is good or just send me another note here. Cheers and 73, Mark

Good luck Ed, Sounds more now to me that it could be a bad relay. The original ones I think are not up to the quality level of an Omron/Panasonic or something like that, plus CW puts them through a lo

Hi Ed, You haven't mentioned your antenna, however it could be like others have said and due to common-mode current getting into some of the control circuits. Do you have a dummy load you can try out

Hi, What did you do to get the relay back in receive mode? 73

Hi Jep, I built one like that in a pen, but then moved it to a metal tube and the readings were much more reliable. I think shielding is important for these to keep stray RF from getting into the DMM.

#v3 #ubitx #ubitx-help

Yes, However careful filter design is needed when using just four filters. The obvious reason is that you still need a good cutoff for the lower frequency band. Not so obvious is that you need to also