[time-nuts] My FE-5680A Came In Today

[Bob Camp]

Hi

Keep in mind that these things make a pretty awful 10 MHz standard. They are spur monsters in a big way. They won't drive your counter nuts, but for anything that wants signal purity - watch out.

Bob

On Sep 17, 2013, at 8:14 PM, Bob Stewart <bob at evoria.net> wrote:

> Hi Bob,
> 
> Yeah, I figured that retuning it would lose the 1PPS.  No biggie.  There are a number of those little connectors in this device, and the two that have cables connected use a flat 90 degree connector with a coax that's a bit smaller than RG-174.  I just want to snap a pigtail on it and lead it out through a notch in the cover where the DB-9 connector is.  There are several examples on the web where people solder wires to the connector and to the RS-232 header.  I'd just as soon avoid soldering wires if I can.
> 
> Bob
> 
> 
> 
> 
> 
>> ________________________________
>> From: Bob Camp <lists at rtty.us>
>> To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>> Sent: Tuesday, September 17, 2013 7:06 PM
>> Subject: Re: [time-nuts] My FE-5680A Came In Today
>> 
>> 
>> Hi
>> 
>> If you retune it, you probably will throw off the pps. The pps drive strength is a bit weak, so you need to be careful looking for it. On some units there is a software command to enable / disable it (as in pps only when warmed up and locked - like a gps). The can / cover on the unit is mu metal (Rb's are mag sensitive). If you drill a hole in it, you are likely to impact it's mag shielding properties. 
>> 
>> Bob
>> 
>> 
>> On Sep 17, 2013, at 6:21 PM, Bob Stewart <bob at evoria.net> wrote:
>> 
>>> My FE-5680A Rb standard came in today.  After the usual inspections etc, I fired it up and I have the purple haze.  The native output is 8.38860798/9 (last digit jitter) as read on my 5335A using my GPSDO as an external standard.  I've got a ways to go before it's all setup, but this is looking good.  Does it warmup and change frequency at all, or can I retune it to 10MHz and use it as a reference without any further ado?
>>> 
>>> Can someone tell me what type of socket that is where you tap off the RF?  It looks sort of like a uFL connector, but a bit bigger.  I'd rather avoid hacking and soldering on this if I can.  
>>> 
>>> Bob - AE6RV
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