[time-nuts] Help with HP 8640B generator

[John Miles]

What do you have in mind?  I have an 8640 cavity that was removed from
service with a noisy transistor.  What limits the noise floor on these
units -- the cavity or the transistor?

The dividers bottom out at around -150 dBc/Hz, so there's no point improving
the cavity oscillator much beyond that unless you want to re-engineer the
whole divider chain, or you only care about the 256-512 MHz range.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of steve heidmann
> Sent: Friday, September 05, 2008 9:29 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Help with HP 8640B generator
>
>
> Hi Rick,
>  
> Is he available to help hot rod one with a SiGe oscillator transistor ?
>  
>                           Steve
>