[R-390] HP 8640B RF Sig Gen Leakage???

Thu, 10 Apr 2003 18:11:22 -0700

Hello Randy,
What are you using to discern the RF leakage from the case of your 8640B?
Is the leakage coming from a particular section or is is uniform over,
across, around, etc. the generator?
I'll present this to our resident 8640B expert and see what his experience,
and thoughts are. In the interim, I will try to duplicate your case with my
HP 8640B as soon as I hear from you, and what you are using to measure this
leakage with.

73,
Glen Galati,  KA7BOJ              [email protected]
Tacoma, WA
----- Original Message -----
From: Randy Zelick <[email protected]>
To: <[email protected]>
Sent: Thursday, April 10, 2003 4:46 PM
Subject: Re: [R-390] Suggested Test Equipment for R-390A Alignment ??

> Hello all,
>
> Speaking of generators, I have a very nice HP 8640B, the source that
> several folks have been praising. Indeed, I like mine very much and would
> agree that it is probably the best generator I have owned.
>
> One advantage of this design (a cavity resonator) is the high spectral
> purity. It can be a plus when tuning selective filters. You can get high
> output without a lot of spurs only 30 dB down that can lead to
> misalignment.
>
> But here is an issue with my unit: It leaks RF!!!
>
> Has anyone else had this experience with an 8640?? I can't believe it is
> supposed to do this, yet I can find no fault with my specimen.
>
> It is lot leaking out the attenuator, which is well calibrated down to 0.1
> microvolt. Rather it seems to be leaking out the case. Switching off the
> RF using the little slide switch next to the output connector does not
> affect the leakage.
>
> Thanks for any suggestions.
>
> Cheers,
>
> =Randy=
>
>  --
> R. Zelick email: [email protected]
> Department of Biology voice: 503-725-3086
> Portland State University fax:   503-725-3888
>
> mailing:
> P.O. Box 751
> Portland, OR 97207
>
> shipping:
> 1719 SW 10th Ave, Room 246
> Portland, OR 97201
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390