[Hammarlund] sp-600 2nd osc

[Richard Solomon]

If you want to measure frequency accurately, you need to use a GPSDO
as the 10 MHz Reference Oscillator for your counter.

Now, a trick I picked up from a Collins Restorer ... use a decent (Tektronix
or HP) X10 Scope Probe. Hook it up to the output of your Oscillator
circuit and connect it to your counter.

73, Dick, W1KSZ
________________________________
From: hammarlund-bounces at mailman.qth.net <hammarlund-bounces at mailman.qth.net> on behalf of Richard Knoppow <1oldlens1 at ix.netcom.com>
Sent: Wednesday, November 13, 2019 9:33 PM
To: hammarlund at mailman.qth.net <hammarlund at mailman.qth.net>
Subject: Re: [Hammarlund] sp-600 2nd osc

    Whoops, 3.49 is 10Khz off, which is significant. Again, make
sure you are measuring the frequency without affecting it. It is
common for older crystals to drift. This one may have done so.
New crystals are probably hard to find now. Make sure your
measurement is accurate before struggling with finding a new
crystal.

On 11/13/2019 8:24 PM, Richard Knoppow wrote:
>     It should be 3.5 Mhz.
--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
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