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Hans, Thank you for clarifying the operation of the band swap. 73, Steve W6WU

This isn't the first time this has come up here...I'm curious as well. I don't know much, but it is interesting to me/ I wonder why 1 uf caps are used on the input here. On the 10W linear PA kit, it

Hello Steve No. It swaps a band called "20" with a band called "80". It doesn't swap slots BPF 1 and 3. I am quite doubtful that this swap is necessary or beneficial if the proper Rev 2 mod is done

@Hans No answers to this question from the group… “ Regarding the "20/80m BPF TXswap". Am I correct in assuming that this is in reality is a BPF 1 and BPF 3 swap without regard to which band or

In a private conversation, one of the excellent contributors of this group shared this link, which I wanted to post here for the benefit of others. Its about all the grounding bits included with a

Hi Joan, just wondering, if this could be the GPS-protection kicking in due to RF on the keying line? Did you notice any "G" in the display? Maybe deactivate GPS protection, if you anyway don't use

Hi Don. That contact burnisher may be too harsh for paddle contacts, especially very costly paddles with silver or gold plated contacts. I would also be nervous about sandpaper, even very fine

Howard, Checking the bias voltage to the mux usually provides a good test of 3253 health. It can be measured at a number of easily accessible points, such as any terminal of T401, or on C406. It

I am using 20m-80m model of QMX. It is self assembly. It is still transmitting and produce right power level. Seems like I should check 3253 from you description. However I am not sure how to do

Thanks Martin, it's very helpful. Giuseppe iu8eun

qrpcluster.com is an interesting project, where QRP stations are invited to announce their activity by self spotting themselves in that cluster. Maybe something the QRP labs comunity can benefit

good morning everyone, yesterday morning I wanted to do a test with the QMX second high band version with firmware 1_00_015, the first transmission went very well, the time was set perfectly by the

Howard , There is some additional info that you can provide to help steer the suggestions in the right direction. What band model QMX (HB or LB) are you using? What version level? Was it factory

Hi, It could well be the case. The DIT has an external 2k2 pullup and the DAH has none. I also suspect it would help in this case. What I would like to see HW-wise is a separate jack (pins) for the

My QMX was working fine and I made couple of QSO via FT8. However I noticed the receiver stop working: 1. I can still hear some strong signals. 2. When I plugin my attena, the S-meter in WSJT-x is not

This does sound easy enough - to make the attenuator attenuate more, although it looks to me that there's a very happy frequency that this amp wants to operate, which implies that somewhere, this

I found this little book of use: McClanaham, J. Oscilloscope Applications for the QRP Enthusiast Not really on-line, but quite cheap, even more so for the Kindle version.? Available at Amazon and

Troubleshooting update. Observing that 3.3V linear supply was not enabled, and that the linear supply needs to come on before anything else happens, I tested the supply board alone by connecting the

Strangely, after swapping back and forth between Firmware 12 & 16 a few times while testing - this problem has disappeared. Still interested if anyone can think of a cause - was using a Dummy

Or one could use the right tool for the job, a contact burnisher: https://www.amazon.com/Jonard-OB-1-Burnisher-Insulated-Thickness/dp/B006C47JOI I wonder whether the issue will return after