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Update: I have done the LPF mod consisting of removing a turn from each of the LPF toroids, and I added the 10K resistor from the drain of Q5 to +12V. I'm a little hesitant to remove anymore for fear

Good evennig John thabks for the informations best 73 jo?l f6cht

I'll type in the voltages at 100khz frequency intervals, from 5mhz to 8mhz, that should answer the ripple question. And yes, have FFT on the scope, will play with both tomorrow and send in

I've just added the 10K bias resistor to Q5 and the transmitter instability at Vcc > 13V has gone. And I think TX power is up a bit as well. I'm still not quite at the power level given in the

https://hackaday.com/2011/12/12/simple-pcb-vise/ _._

It is really handy. I have one made by a different company but it is exactly the same. Robert (N5RHA) Sent: Tuesday, November 7, 2017 3:42 AM To: [email protected] Subject: [QRPLabs] A

Have you got an FFT function on that scope ? It would be interesting to look at the harmonics present. PeterO G0DZB

Another good one is the Stickvise but more expensive at $30.00. Best used when screwed on a board and using spacers to elevate the jaws. Jean-Claude

This is strange as the passband insertion loss should be fairly constant. At higher frequency the attenuation should increase, not decrease. Do you have any ripple in the passband? Could it come from

Oops, forgot to add the screenshots! Sorry J

Hello all. I've been having a great time operating my 7mhz QCX. Worked Russia, Switzerland, Denmark etc and had a great time. This afternoon I hitched up the 'scope to a 50 ohm dummy load and checked

Aven 17010 Adjustable Circuit Board Holder Sold by: Amazon.com $11.34 In Stock 73, Jim N3SZ -- Jim Sturges, N3SZ Amateur Radio operators do it with frequency.

For USA builders, Amazon carries it under several different manufacturers names.? On their website search for "pc board holder in tools & equipment.? I got mine for under $12 (plus shipping if you

The Duratool D03170 ?PCB holder looks exactly like what I have been hunting for . The ?Duratool part can be purchased on eBay from several UK sellers, but the international shipping to USA is

Looks like they are finally getting that huge backlog cleared.? The website shows "Next # to ship" as 890 as of Nov 5.? My 40 meter QCX is #934 and I just got the email this morning (U.S. Central

Thanks.? Had a look at that section and because I never touched the chip... and that the display was fine up until is wasn't, then I'm figureing the chip is fine.? ? But... I'll have a second

Hi Barry, I've seen that a couple times but power off/on solved it in my case, in your case have you looked at trouble shooting 6.3 in the manual (around page 124)?

Hi Karl, All you have to do is Read The Fine Manual. [Page 50 in the A4 version of v1.08] A good read, while you wait. Best Wishes David, GM8XBZ

While I await my QCX kit to arrive, where can I find " WA4MZS’s drawing" for the T1 windings?? Tnx, Karl

QCX on 30 metres, firmware 1.00b, 12V from a battery I've posted regarding some audio woes I've had regarding the QCX.? Last night, I wanted to check transmission, so I thought I'd try the WSPR