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By the way, there is a 2N2 discussion group on Groups.IO.? I posted a question regarding modification of a 600:600 transformer for use in the 2N2 output section.? I no longer need one but others

G3URR crystal measurement method Mike, In one of his more recent postings to his website (~last two or three years), W7ZOI changed the oscillator's emitter resistor from 1K to 3k3 to reduce drive to

The wiki page Current and Past Group Projects on QRPTech (and ole QRP Tech) ( /g/qrptech/wiki/38905/218917 ) has been created by Daniel KK4MRN

Wanted:? TenTec 1315 (15m), but will settle for 1320 (20m). What have you? chuck

Is there a website to look up rules, etc.? I have a sasquatch number.. if I can find it..? hi hi.. 73, Gary WB6OGD

Hopefully, people do not mind me posting the link to our wiki page yet again.? Feel free to add more links. Sources of QRP Homebrew Supplies /g/qrptech/wiki/23197S (

Thanks Gary, i’ll be listening for you. ?Good luck. Wayne

Speaking of crystal measurements, I got highly involved in that some years ago and now I'll toot my own horn a bit with this link to a presentation I did on the subject at OzarkCon.

Look what turned up in the "Magnetics" box! Howard, n3fel

Timely post for me... I haven't done a manhattan style build in a while and thinking that it was time to do another, decided three or four weeks ago to build the soldersmoke 40M DC receiver. I thought

How about expanding your diode test circuit to do matching similar to this (post #1) https://groupdiy.com/threads/diode-matching-test-jig-for-diode-limiters.42327/ -- Terry VK5TM www.vk5tm.com (

Attached is the .pdf of the schematic Q tester on a white background

Attached is the proposed circuit. It uses loose coupling to a parallel resonant tank circuit via 1pF caps and a high impedance buffer amplifier consisting of a J310 and two 2N3904 emitter followers to

Mike, With the ADC project, I plan to revive a research scenario that has been partially done.? Use the K8IQY, G3UUR, K7QO and other matching techniques on a batch of 100 9.000MHz crystals.? Compare

I have a collection of 60s', 70's & 80's vintage semiconductors available. I've begun a Google spreadsheet with descriptions as best as I can find information. Several of these devices are of

Below is an update on the schedule of speakers and presentations for the Southeastern VHF Society Conference. The conference will be held at the Quality Inn at Exit #4 in Clarksville, TN April 4-5,

Hi Chuck, We have plenty of crystals, but they are all the frequencies for the different VXOs used in the 1W and 5W radio kits. The IF frequency crystals are all gone (apart from a handful of each in

Hi Dave, Thanks for the intel on Dan's Small Parts source for MV1662 varactors! I am submitting an order on Monday. "I even used a 3 terminal regulator device in place of the zener in mine *shock

I had an idea to combine many different test jigs into a 80mm x100mm 2 layer PCB. So far I have the following test jigs on the board: 1. Inductor Q/Self resonant frequency test jig. This connects to

If anyone is curious, I have all the data files on github for my take on the 2N2-40+ https://github.com/ku4qo/2N2-40-plusplus The VFO, BFO and Xmit signals are synthesized, the output amp is the now