[TenTec] Century/22 tapping rx freq for digital counter

[Dave Edwards]

I'm no expert, but I think you want to leave the counter on the bench.
Check this site out for a display....
http://www.aade.com/applications2/app2.html

Because the rig mixes signals, and uses the sum in some cases, and the 
difference in others...perhaps even the same rig, for different bands...You 
need a bit more "smarts" than simply tapping your counter onto the leg of a 
chip.

I still have 5 or 6 old Heathkit SB650 freq readouts for the old Sugar 
Baker/Hot Water lines.  Back then, it was like a friggin computer!  Large 
board loaded with chips....plug in no less....amazing that they still work!! 
But same thing, it had to take three frequencies from the rig, and juggle 
them to get a readout.  Probably all done with a single PIC these days. 
:-)


.....Dave



----- Original Message ----- 
From: "VE3XGB" <ve3xgb at sympatico.ca>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Cc: "VE3XGB" <ve3xgb at sympatico.ca>
Sent: Saturday, February 12, 2011 10:04 AM
Subject: [TenTec] Century/22 tapping rx freq for digital counter


> Hi all,
>
> I've got a digital freq counter and wanted to use it as a digital freq 
> readout on my Century/22 but I can't seem to find a 'source' in the rig. 
> The circuit diagram shows the mixer as a UPC1037 (?) IC but mine has a 
> MC1496P.
>
> Anyway I found the data sheet for the MC1496P double-balanced mixer and it 
> would seem to suggest that pins 6 and 12 were the output but when on 80m I 
> couldn't find a 3.5XX MHz signal on any pins.  I can see the 10.000 MHz 
> band crystal output and I can see the 6.5 MHz PTO output (difference in 
> the 3.5XX range) but nothing 3.5XXX
>
> Thanks for any suggestions
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