[time-nuts] FS HP 5335A

Bob Camp kb8tq at n1k.org
Wed May 18 11:32:17 UTC 2016


Hi

Totally disabling the internal reference was a *very* common thing to do on the 5335. It often 
became a war of switching things back and forth (for various odd reasons). In some factories 
the ultimate “disable” approach was pretty drastic. 

Bob



> On May 17, 2016, at 10:06 PM, Tom Holmes <tholmes at woh.rr.com> wrote:
> 
> HI Bob...
> 
> Thanks for the tip. Have been down that road with this one and it didn't fix it. I think someone may have deliberately disabled the internal timebase to prevent users from having anything but the house standard in play. 
> 
> Tom Holmes, N8ZM
> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Stewart
> Sent: Tuesday, May 17, 2016 7:08 PM
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Subject: Re: [time-nuts] FS HP 5335A
> 
> Hi,
> 
> I know this is a for sale post, but there's a jumper that needs to be there to work with the regulator oscillator.  Page 2-4 of the Operating and Service Manual (05335-90021) details the instructions for installing the Option 010, the 10811 OCXO.  Instruction "c" is below.  You'd need to add the jumper back in.  The factory jumper looks like a resistor.  It may simply be cut with side cutters on your unit.  You can use just a piece of wire, of course.
> 
> "c. Remove electrical lead (jumper), PIN 8159-0005, that connects A4U1B(6) and U2B(6)."
> 
> Bob
> --------------------------------------------
> On Tue, 5/17/16, Tom Holmes <tholmes at woh.rr.com> wrote:
> 
> Subject: [time-nuts] FS HP 5335A
> To: "'Discussion of precise time and frequency measurement'" <time-nuts at febo.com>
> Date: Tuesday, May 17, 2016, 4:38 PM
> 
> For some reason it did not have an
> internal timebase when I got it, and
> throws an error, UNLESS you have an external 10 MHz
> connected before you
> turn it on. Then it works fine.
> 
> 
> 
> Please contact off list for details,
> 
> 
> 
> AND if you happen to be in Dayton, OH, this weekend for a
> little ham radio
> swap fest with a mere 25,000 people attending, no shipping
> required. 
> 
> 
> 
> AND there will be at least a few known time-nuts in town if
> anyone wants to
> meet up. Make yourself known to John at the TAPR booth.
> 
> 
> 
> Tom Holmes, N8ZM
> 
> 
> 
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