[TenTec] Scout Frequency Error

Dale Putnam daleputnam at hotmail.com
Sat Dec 22 20:50:03 EST 2018

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 at contesting.com> on behalf of Winston <jones_winston at bellsouth.net>
Sent: Saturday, December 22, 2018 6:47 PM
To: tentec at 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

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