Vernon, I have run the PA Amp on 630 M for over a year on WSPR and it is about 5 watts- except for last 30 days as I'm testing an MF Solutions transverter. I did mount the amp in the U3S case with a

OOPS image ? N3AAZ SETUP

Hey there, Nigel. Not having a stock QCX-30, I can't speak to its performance on other bands. But, as for my stock QCX-17, I have enjoyed more QSOs with it on 30m than on any other band...would love

Niger, Of course T1 is prime but not as critical as one thinks :>) This pcb with 30m T1 is a four band xcvr Parallel C1 and Outboard LPF and Bypass onboard audio filter and Add variable (tunable)

There are 3 parts of the QCX that are band specific: input tuned circuit, output low pas filter and class E amplifier. I also have a 30m QCX. We should have QCX activity that isn't a contest so that

Hello again from ZS land :-) Following on from my posting yesterday in reply to Bill re: "A somewhat more complete description of my (ab)use of the QCX-17 and QCX-80 transceivers, today I became aware

Thanks for the tip Richard. I'm out of town for a couple of days, but I've got an LCR meter on order so I'll check those caps out when I get home, as well as my inductors. My first time winding

Hi Al Yes. Non-critical. The most non-critical place for the low one would be C21 or C22. 73 Hans G0UPL http://qrp-labs.com

Turnigy makes a good product and I've used a lot of their packs... However read the information its 2.2AH 1.5C that means the max current is about 3.3A and standard .5C charge rate. For QCX that's

I found this on Amazon today: https://www.amazon.com/dp/B00USRD91W/ref=cm_sw_em_r_mt_awdb_4muTCbG8JHMRP It's a 3s li-po 2.2Ah pack w/ protection built in for under $25! Seems like a great option for

Section 3.16 of manual Install 1uF capacitors (3). I measured two caps at 0.978 uF I measured one cap at 0.775uF . About - 22% tolerance Should I install the low cap??? Thanks, -- Al

Hi all, I run a couple of the QRP Labs on different bands and have found the output on say 80M and 160m were very good. More than 5 watts. In fact on 80m it will bury the needle on my Oaks Hills

Almost forgot -- in order to do this APRS stuff you need some JS8 stations set up to forward (via the internet) any received JS8 messages that contain the APRS flag. I don't know how many JS8

Again, this is an older topic, but with JS8 you can do way more than APRS position reports. You can send arbitrary telemetry data, not only to the APRS network, but you can use the APRS email and

I'm afraid I've tried this. The calibration is now set to Step 01, Time 060, but the step size was larger initially. The frequency has more or less stabilized to 26,998,733 which should be about

One other thing, are you using the gps to calibrate the u3s? The OCXO oscillates at a lower frequency, maybe the OCXO is set correctly and it's working it's way to its settled point. I use a big

Love what Andreas, DM5MU did with those plug-in modules ! Very nicely-done six-band QCX rig, Andreas ! Tnx & 72 / 73, Bill, N4QA

When I was using the plain old Si5351A synthesiser module (no GPS correction) I was getting drift reports of 0 or 1 - it was very stable. My U3S is in the aluminum case but I have a LM7805 voltage

Thank you, Alan...I'll have a look ! 72 / 73, Bill, N4QA

Bill, There are a couple of reports of multi band builds here on the web / forum, a search should find a few different ideas / implementations. One such build is also shown in the