[time-nuts] Ventilation of HP 58503A GPS time & frequency reference receiver

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Mon Dec 15 01:38:27 EST 2014

On 15 Dec 2014 00:52, "Tom Van Baak" <tvb at leapsecond.com> wrote:
> If any of you want me to post more photos let me know. I have several of
every kind of HP/Agilent GPSDO product. And they are all genuine because I
bought them a decade before the China/eBay/GPSDO business.

Hi Tom,
I would appreciate some pictures of a 85053B that is

* mains powered
* Does not have the keypad/display

if you have one.

I appreciate given the options on this instrument, you might not have one
with the exact same configuration as mine.

Ideally pictures of the front,  back, sides & bottom.

I was intending dropping Symmetricon an email in the hope that they could
help. If they had an HP one it would be really useful.

I am weary of believing any photo I currently see on the web to be honest.
Someone said 90% are likely to be genuine,  but I am not so sure that is

I rather suspect a lot of dealers have fakes, but are unaware of it.

I notice that the keypad & display were available as an upgrade,
suggesting that the case would not need extra ventilation,  so the case
should be the same, but eBay may be less convinced. Likewise I doubt a
different case would be used for AC and DC models, but eBay might be less


More information about the time-nuts mailing list