They would do the job OK but I used some from a scrap car. Relays don't usually get hurt in a RTA.

Hi group. ive acquired a QCX V3 kit (partial, some components missing) and I’m planning to build a 20m version, latest firmware and a LPF kit ordered. Looking through the mods on the QRP Labs page

Craig, For a start you need to start a new topic with a title giving the kit you refer to and the fault symptom. For example "QCX 40m Si5351 error message" Mixing topics is not good your problem has

Saw you on RBN and listened and called many times. No contact. Sorry. Clearly heard and called N4SO at 0355 on 7039.6. K4JTP many times. KJ4BQS and KI6KU many times. But no QSL from any. I am

Rick I have read you, abt 429 here in EA8 (IL07xs) - gave answer but no success.. next time. -- --- 73 de Erich HB9FIH HS0ZLS

Unfortunally I missed the 13/19 UTC Challenge (had visitors here) But got up for 03:00 RV with succcess HA9RP / OK2PUX - QCX / G3KSU I read some QCX eg W9REA an LU1DBI but they din't read

Hi, I am newbie withis qro solid state stuff. I just competed the assembly of the wee 40 Meter rig. It is not working . It appears that the 27 meg Osc is not doit’s it’s thing. Nothing on the

Like shown here: https://www.amazon.com/GOOACC-Automotive-Interlocking-Harnesses-Warranty/dp/B01M74X0ZK/ref=mp_s_a_1_7?keywords=automotive+relay&qid=1580174506&sr=8-7 ? Thank you, George

I don't necessarily think that the Si5351A itself is bad above 90 MHz. I agree that there are better solutions but also at a much higher cost. My RFzero is usable at 200 MHz with spurs at -60

Thanks, Hans, for nicely pointing to all of the stuff that was right there in the documentation! Wow, back biasing the diode at 550 volts! There's some insight into the total ratings issues

An efficient way of providing reverse power protection is to run the supply through a relay with the relay switched via a diode such that the relay will not operate with the supply reversed.

The bit of data sheet figure 4 is the define the limitations of the IRF510 safe operating area. Safe in this case means no failure if on a infinite heatsink. Its current vs voltage and the result is

Don, It was heat or the device was bad initially from carpet lightning. Keep in mind you can get a IRF510 hot enough to die without even warming the heatsink Simple way is make it dissipate 50W

With 22v from a SMPS and 1.8V I’m getting about 45W on 40M, it’s ideal for what I want. Just ordered another one for 20M so fingers crossed! 73 de Mike, G0JXX

Wow, I must stay awake next time for that time segment. I was on 40 shortly before 1300z and experienced the most rapid propagation collapse ever, from 599/599 with a Tokyo friend to unreadable the

Tried the 1300z session on 20m, as I have several times in the last few months. Still no QSOs at all despite numerous RBN spots for my CQs all including US. At least I heard some stations this time

Wasn't heat. It was only keyed about 15 seconds. Immediately upon failure I felt the heat sink and it was still stone cold (the lab was unheated and 10 C.). I originally thought that there had to be

Hi John See the references in the theoretical section of my 50W PA manual to the document by W6JL. And his QRZ page https://www.qrz.com/db/w6jl Don W6JL uses a single 1N5408 diode for switching 600W

The biggest issue is phase jitter is essentially noise in the frequency domain ie: FM. All of the papers that address this try to translate that from to amplitude where noise is measured (usually).

Two 1900hr contact both non QCX. First contact was impressed any plans to order QCX.