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[time-freq] RE: time-freq Digest, Vol 3, Issue 1

Brandon Garrison Brandon at ontargetenterprises.com
Fri Dec 9 18:14:38 UTC 2005


Yes, I adjusted the pot, it allows for variation between 0V and 4.4V
when the output from the PWM is high.  I can't seem to get any more than
that out of it, I have 2 boards, and they both give the same results.
Perhaps I'm missing something in the DAC or the follower circuit, but
ohm'd out everything looks right.

Thanks again,
Brandon

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Sent: Friday, December 09, 2005 11:03 AM
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Subject: time-freq Digest, Vol 3, Issue 1

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Today's Topics:

   1. VCXO Recomendatinos (Brandon Garrison)
   2. RE: VCXO Recomendatinos (Steven Bible)


----------------------------------------------------------------------

Message: 1
Date: Thu, 8 Dec 2005 16:40:25 -0700
From: "Brandon Garrison" <Brandon at ontargetenterprises.com>
Subject: [time-freq] VCXO Recomendatinos
To: <time-freq at lists.tapr.org>
Message-ID:
	<C5FFB72552D0204A87EF3947106544BA03F305 at exchange.tec.local>
Content-Type: text/plain; charset="us-ascii"

Hey guys, I was trying to set the Reflock II up to work with a VCO that
I had lying around (a POS-75 from mini circuits) and I'm realizing there
is just way too much play in the VCO.  I'm looking to build a 60MHz GPS
synched clock, what VCXO might you guys recommend, and where could I
pick one up.  I was also looking at the op-amp output and can't seem to
get much more than about 4V out of it, is it supposed to give a full
swing?  Thanks for any help,

 

Brandon

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Message: 2
Date: Thu, 8 Dec 2005 20:01:59 -0700
From: "Steven Bible" <n7hpr at tapr.org>
Subject: RE: [time-freq] VCXO Recomendatinos
To: "TAPR time and frequency projects" <time-freq at lists.tapr.org>
Message-ID: <DEEIIECOPELFOEIOFHLGEEDFIFAA.n7hpr at tapr.org>
Content-Type: text/plain;	charset="US-ASCII"

Hi Brandon,

The potentiometer should allow you to adjust the voltage up to 11 Volts.
Have you tried adjusting the pot?

73,

- Steve, N7HPR
 (n7hpr at tapr.org)



-----Original Message-----
From: time-freq-bounces at lists.tapr.org
[mailto:time-freq-bounces at lists.tapr.org]On Behalf Of Brandon Garrison
Sent: Thursday, December 08, 2005 4:40 PM
To: time-freq at lists.tapr.org
Subject: [time-freq] VCXO Recomendatinos


Hey guys, I was trying to set the Reflock II up to work with a VCO that
I
had lying around (a POS-75 from mini circuits) and I'm realizing there
is
just way too much play in the VCO.  I'm looking to build a 60MHz GPS
synched
clock, what VCXO might you guys recommend, and where could I pick one
up.  I
was also looking at the op-amp output and can't seem to get much more
than
about 4V out of it, is it supposed to give a full swing?  Thanks for any
help,

Brandon




------------------------------

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