The K2/100 has two ALC circuits. One is found on the K2 Control Board (MAX534). This ALC works in the CW mode. The other is found on the KSB2 Board and works in the SSB mode. This is the Tracking Automatic Level Control (TALC). Tuning up a QRO amp by holding the K2 TUNE and RF/ALC buttons (in any mode) produces the correct amount of CW RF power from the K2/100 for the desired QRO output. To obtain the same desired SSB peak power output it is necessary to turn the POWER control down.
I have the PSK31 KSB2 ALC Time Constant Change Mod installed, but John Grebenkemper (KI6WX) says he does not think the change in time constant would be an issue. He says this mod was designed to increase the hold time for the TALC to what is used in most transceivers.
I understand the complexities of measuring peak sideband power so it can be assumed there is a certain amount of error in the reading. With that said I still wonder why these two ALC circuits don't more closely track each other for the same POWER control setting. Thirty five watts in the CW mode results in 1000 watts of output in my case. Fifteen watts of modulated SSB results in 1000 peak watts. I would like to know if others using QRO amps find similar amount of variance in the POWER control. Thanks. Roy Morris W4WFB
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.9.7/379 - Release Date: 6/29/2006
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com
Locked
