[Test-Equipment] HP 8656A question

Mon, 21 Jul 2003 18:35:27 -0500

Carl, check Ebay for the manual. Usually lots of them on there. However, . .
.

A friend has a copy of the manual on CD. When I see him, I will make a copy
of that file and email it to you. Might be a few days, though.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:[email protected]>

----- Original Message -----
From: "Carl Walker" <[email protected]>
To: <[email protected]>
Sent: Monday, July 21, 2003 6:09 PM
Subject: [Test-Equipment] HP 8656A question

> Hello to the list.
>
> I'm the proud owner of an HP 8656A signal generator, but it seems to be
> suffering from a bit more residual FM than I would like - but only below
> 100MHz.
>
> Above 100 MHz, the tone produced in a SSB/CW receiver is pure and
> un-wavering. Below 100 MHz, there's several Hz of "warble" - and it gets
> worse as you go down in frequency - becoming perhaps 20 to 40 Hz as one
> approaches the lowest operating range of 100 KHz. It's a fairly fast loop
> instability that's really quite difficult to judge frequency deviation
from
> by ear alone, and far too random in nature to get a feeling for with a
> counter.
>
> As you've probably guessed, I don't have the service and maintenance
manual
> for this beast - nor do I have the operators manual to confirm what the
> residual FM specifications are for the unit (I'd hope they would be better
> than what I'm witnessing).
>
> This is an Option 1 unit - but the generator suffers from this ailment
> whether on the internal oscillator or being driven externally from a
rubidium.
>
> Is there with anyone that can confirm what the specification is? Is there
an
> alignment section for PLL operation that can be copied from the service
> manual that wouldn't require copying the entire manual? I'd also not mind
> purchasing a photocopy of the service manual if someone has one they would
> like to sell (I've only seen copies on the expensive manual vendors web
sites
> that are going for 25% of what the generator cost).
>
> Thanks for any pointers,
>
> -Carl, WA1RAJ
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