Message-ID: <01C245F0.733C6280.g4jnt@thersgb.net>
From: "A C Talbot" <g4jnt@thersgb.net>
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: Re: Piezo oscs
Date: Sat, 17 Aug 2002 13:16:38 +0100
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These Piezo modules work OK off a 12 Volt supply.  The heater takes several 
tens of minutes to reach operating temperature (can be even up to an hour 
in cold weather) but it gets there eventually.  The oscillator runs off 
anything greater than 10V and has an internal regulator.

Pin 11 appears to be an oven status output.  It has 10k resistance to 
ground when oven is up to temperature, open circuit when cold.

Andy  G4JNT


-----Original Message-----
From:	Walter Blanchard [SMTP:blanch@pncl.co.uk]
Sent:	2002-08-17 09:44
To:	rsgb_lf_group@blacksheep.org
Subject:	LF: Re: Piezo oscs

At 12:10 16/08/02 +0100, you wrote:

>Dear LF Group,
>
>A while ago, I got a 10MHz OCXO reference - one of CARC's surplus goodies. 

>It is a Piezo Systems model 2810007-1, and appears to be a clone of the
>HP10811 references. I have the pin-out for the HP unit, but I remember
>G3JKV mentioning that these units had a slightly different pin out from
>the HP original - does anybody know what the difference is?

Hi Jim,

Pin 1 is next to the little hole in the tagboard.
1 = Osc out.
2 = Osc ground
3 = +24v
4 = 24v grd
14 = Oven +24v
15 = Oven grd.

They are fast warmup so take 600 mA at 24v for the first 15 mins or so then 

drop to 80-100 mA.
The changeover is very sudden so I suspect it has a dual high/low power 
heater

Walter G3JKV.
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