[time-nuts] (no subject)
johnk0gcj at juno.com
johnk0gcj at juno.com
Tue Dec 8 13:49:05 EST 2015
Someone with more knowledge/experience than me may know better than to try this and will let everyone know not to, but the second harmonic reading on my 5065A had been gradually decreasing until finally it wouldn't come up at all. After trying the same thing you did(not having the equipment to do the procedure in the manual) I started changing adjustments after first marking their original settings. The second one I tried was the pot(I believe it is R29) near center rear looking from above(with the top cover removed, of course). It's the one(on my 24xx? if I recall correctly, the latest series anyway) with the two white plastic adjustments whowing through a hole about 1/2" diameter. Sorry I can't give exact information, but I'm writing this from memory, as the 5065A is about ten miles away. Anyway, I moved it about an eighth turn at a time and on the third try the second harmonic came up. I set it, as I recall, to about 32 and it's been working fine for the last couple weeks. As I said, if this shouldn't be done for any reason, hopefully those in the know will let me/us know. John K0GCJ
---------- Original Message ----------
From: paul swed <paulswedb at gmail.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Subject: Re: [time-nuts] (no subject)
Date: Mon, 7 Dec 2015 08:29:42 -0500
Welcome to time-nuts and you were indeed lucky to get a 5065.
Lots of possible items.
But the fact that the last line are all 0 may mean its as simple as the
loop selector being open and not closed. Normally the control would tend to
drift all the way over. On reset it goes all the way left and if it doesn't
find the second harmonic it goes all the way to the right. Easy thought at
Beyond that many possibilities for issues. After all they are old.
On Sun, Dec 6, 2015 at 11:30 PM, Jim/Anna McIntyre <bbimini at gmail.com>
> Greetings all,
> My name is Jim, I'm a Noob to your list. A local DoD contractor unloaded a
> heap of test equipment lately, and I scored a 5065A. It's s/n 1532A00666,
> has an Olive green-ish RVFR, and a 00105-6103, series 1284 Quartz
> I have had the instrument powered up for about an hour now. (I first
> checked the +/- 20V supplies and they're OK.) I have a 1A source connected
> to the TE lines.
> At the end of the 1st hour here's what I'm seeing (Open Loop Mode).
> Batt 48
> Supply 38
> Lamp Oven 30 (down from 50)
> Cell Oven 30 (down from 50)
> Osc Oven 44 (down from 50)
> Photo 28
> 5 MHz 32
> Control, Error, 2nd Harmonic all read 0
> I adjusted the Quartz Coarse control to be within 10-7. Fine is set to
> 250. Synth output measures 5.315 005 728 MHz, and is about 1.8 Vpp.
> Control, Error, 2nd Harmonic all read 0 after I switch to Closed Loop and
> hit 'Start'
> Please advise on next steps...
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