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Once conditions had faded here on 5000 kHz late this morning, playing with the QCX-80 became less fun so, I unhooked the??Chameleon?interface from the QCX-80 and connected it to the QCX-17. WWV has

Hans and Mike I would encourage Mike to try building his own H&P frequency stabilizer. Initial look at the design may seem a bit overwhelming for such a trivial circuit, but it really is not that

Thank you Axel, I find a lot of contradictory information on all sorts of subjects. My own experience with PFR-3 - has several 'polyvaricons' - suggests they are suitable at low power levels. That is

I worry about this, because using other tuning capacitors than these would be difficult ("big"). I did a search for W7ZOI's test and found this http://w7zoi.net/twofaces.pdf. According to page 19, he

Should have said "I'd say that's about right, but NO more". - Andy -

https://www.ebay.com/itm/1Pc-Inline-Switch-With-Female-Power-Cable-Dc-Connector-Switch-5-24V-KW/163621868702?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 Reckon I'll cut off the doo dads

I've also characterized the LP filters (maybe 5 or 6) with my Siglent spectrum analyzer and had similar results. I think the best performance I had at a band edge was ~0.3 db down the worst was about

Look, Ma ! No mechanical rotations ! 3.7 = CW-R 4.8 = 800 Also tuning around, listening to AM SWBC stations. Audio is a bit pinched... Off camera, those three little wires are connected to pins? "1",

Hi Mike I love Huff Puff circuits. There's no doubt though, this technique is practically-speaking outdated now it is so easy to generate clean stable signals so cheaply with chips like the Si5351A.

Considering the crudities of the termination of the lpf, I'd say that's about right, but more. 73 de Andy

My sentiments are exactly like Jack's. Having also started in 1954 with a Heathkit AT1 and following with all sorts of QRO rigs I now find I'm practicing CW daily so I can work QRP with my 20 and 40

Allison, Taking 2 turns off each, brings it down to 1.5 db @ 14.000 MHZ, and I did normalize the set-up! I have .8 db at 2 MHZ! Phil --- This email has been checked for viruses by AVG.

Andy, Thanks for the help... taking 2 turns off each toroid brings it down to 1.5 db @ 14.000 MHZ. Is this typical ? (I did normalize the test set-up.) Phil --- This email has been checked for viruses

Joe, I agree, far as I'm concerned every milliwatt or db counts if your goal is to have more QSOs and especially more DX QSOs .??? A lot of other things figure in but a little more power or a

As I recall, my first QRP rig (other than my not-really-QRP 15W? Novice rig in 1954) was the CRK-10A, a 40M transceiver. I was amazed at what the receiver could pull in, and all for around $40 at the

Hi Joe, If you are concerned about current drain, drift, AND phase noise you might consider a VXO. Obviously it won't tune from DC to daylight. So many choices, -sigh- 73, Bill KU8H

Hi Joe, My first response was about what QRP *is*. It's about reduced power at the transmitter output and more recently folks think of 5 watts. It is not about the physical size of the gear. Obviously

Its not uncommon to see a 10% variation from one wound iron power core to another.? Add to that even 10% caps and yes they can gang up on you. My first test it to make sure the winding occupies 2/3

Hi Allison All good points, however consider in the context, this is a PTO I am building for my Norcal 2030, a rig which has phenomenal dynamic range and large close in signal handling while sipping

It is pretty funny picturing those kilowatt capable match boxes on a picnic table beside a diminutive QRP xcvr. But food for thought: The QRO guys build those big clunky (but low loss) boxes and run