Re: [Elecraft] Problem driving an old tube amp with a K3.

All, This was an operator error - the delay between T/R relay closure in the amp and the start of RF was too short. Setting the delay up from 8 to 20 msec solved the problem. Thanks to all who offered advice. Bill K5EMI __ Elecraft

[Elecraft] Problem with K3 driving old tube amp

All, I am trying to bring a Drake L-4B to life. I have done the power supply rebuild, the soft-start and other mods. I have also directly grounded the grids of the 3-500Zs (Eimac brand). In driving it with my K3 (SN 51XX, software up to date) I find that the RF power stair-steps to the set po

[Elecraft] K3 SSB problem

I have seen a problem when using the K3 in SSB. While trying to work a DX station on 10M, waiting for the next chance to call, something causes the K3 to stop transmitting on SSB. The PTT still works as normal and keys the K3 and the power amplifier. If I change to CW, it transmits as usual. I

[Elecraft] Spectrum Display for k2

Recently I have implemented a downconverter to convert the K2 IF to baseband so that the spectrum can be displayed on a PC using a SDR software package such as "NaP3". To route the IF out of the K2, I used a Z1B buffer amplifier kit from Clifton Labs, and for the downconverter I used a spec

[Elecraft] K2/100 Oscillation Problem

I have an older K2/100, but it has all the mods that I know of and it has served me well for about the past six months that I have owned it. Recently, I noticed on the station monitor scope that there is a "ragged" appearance to the waveform, on one side only, as I send CW at 100 watts, and as

[Elecraft] K5EMI's KDSP2 is sold

The KDSP2 that I offered for sale is sold. Bill Stewart, K5EMI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/li

[Elecraft] K2 DSP For Sale

I have a KDSP2 unit for sale. I built this unit last year when I built K2 SN 5251, and it works fine, but I have installed a KAF2 and it is more convenient for me, as I am a CW-only operator. Included are the manual, a new battery in the Elecraft envelope and the headers needed for installation. T

[Elecraft] Another amplifier idea for the K2

Seeing all the email traffic about amplifiers driven by a K2, I thought that I would relate my experience. Several years ago, I built a homebrew HF CW transceiver for 40, 20 and 15m bands, and I built an amplifier into a unit with a Transmatch to complement it. I used the EB27A from Communications

[Elecraft] Re: Amplifier T/R Keying problem - solved

I have received a suggestion from Don Wilhelm to install an RFC from the Rx port to ground, and this solved the problem. Many thanks to Don for his advice and prompt response. Bill Stewart, WU0R _ From: William Stewart [mailto:[EMAIL PROTECTED] Sent: Saturday, January 28

[Elecraft] Amplifier T/R Keying problem

I have a problem trying to key a "homebrew" amplifier with my K2 (S/N 5251). I am using the two-transistor T/R circuit from the "Mods" web page, and the T/R relay pulls in as expected, however there is an annoying "thump" in the received audio when the T/R returns to the receive state. I am using t