[TenTec] Questions on Corsair II

[Mike Hyder -N4NT-]

Dim memory (I've slept since then) is that it was recommended to replace 
the keyer speed pot with a linear one and vice versa if it is already a 
linear one.  Seems the "audio" pots didn't work well in this 
application.  (Remember that I've slept since then.)

73, Mike N4NT

----- Original Message ----- 
From: "Steve Hunt" <steve at karinya.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, October 09, 2006 8:20 AM
Subject: Re: [TenTec] Questions on Corsair II


| Steve,
|
| On my Corsair II the keying function is carried out within the 
MicroProcessor that's driving the digital frequency readout. It's U10 on 
Logic Board 81246 - the schematic is on page 3-30 of my manual.
|
| But its speed is determined by clock oscillator U1A U1B U1D on the 
Audio Processor board 81255 (Schematic page 3-20). The front panel Speed 
Pot goes to connector 17 on this board, and the clock output appears on 
connector 15 to drive the processor. So if you're only interested in 
making the Speed Pot less sensitive you don't need to go near 81246
|
| Interestingly, I reckon the Micro is hard pushed to do the CW function 
and count the frequency - I noticed early on that when you key the rig 
in CW mode the 100Hz digit sometimes goes + or 1. I've checked, and the 
actual frequency doesn't change - just the readout! It doesn't happen in 
SSB modes.
|
| 73,
| Steve G3TXQ