Hi Winston,
The trimmer you see, is what is used to zero beat with WWV to calibrate the
counter.
Easy to do, with a rx tuned to WWV on 10mhz, and lightly couple a bit of signal
from the counter
into the rx also.. nice beat note can be brought down to exactly zero beat.
Good Luck,
Have a great day,
Dale - WC7S in Wy
"Actions speak louder than words"
________________________________
From: TenTec <tentec-bounces@contesting.com> on behalf of Winston
<jones_winston@bellsouth.net>
Sent: Saturday, December 22, 2018 6:47 PM
To: tentec@contesting.com
Subject: [TenTec] Scout Frequency Error
I have Ten Tec 555 Scout with a frequency display that reads 100 Hz high on all
bands.
Looking at the schematic of the counter logic board, I notice a trimmer cap
(4-20 pf) in parallel with the 4.0 MHz crystal in the microprocessor circuit.
It is labeled C3 on a pictoral of the board.
Is this the control I would adjust to bring the counter readout to the correct
frequency?
If so, could this by accomplished by adjusting it to zero beat while tuned a
known frequency, such as WWV at 10 MHz?
I’m not familiar with logic circuits, so wondering if it’s a simple adjustment
or something that needs to be done by a technician in a well-equipped shop?
Any help would be appreciated.
73, Winston K4CWQ
Sent from my iPhone
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