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@karinya.net>
To: "Discussion of Ten-Tec Equipment" <tentec@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
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