[time-nuts] My FE-5680A Came In Today
Bob Stewart
bob at evoria.net
Wed Sep 18 01:07:41 UTC 2013
D'oh! But is there a way I can run for let's say 200 pulses on the B channel and see the count on the A channel?
>________________________________
> 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 7:54 PM
>Subject: Re: [time-nuts] My FE-5680A Came In Today
>
>
>Hi
>
>For checking things like GPSDO's the pps is actually much more useful than the 10 MHz. Just do the count one to the other trick and you have a very good way to test what's going on. In it's normal configuration it should tune to within about 1 ppt of the proper frequency. That would be 10,000,000 Hz / 1,000,000,000,000 or 1 ns every thousand seconds on the pps.
>
>Bob
>
>On Sep 17, 2013, at 8:37 PM, Bob Stewart <bob at evoria.net> wrote:
>
>> Hi,
>>
>> I'm just looking for an accurate standard for my GSPDO PLL coding. As it is, I've been depending on others who have these to tell me the code works. I understand that when these are retuned to 10MHz, they're .005Hz off due to the DDS. I'm good with that. =)
>>
>> 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 7:30 PM
>>> Subject: Re: [time-nuts] My FE-5680A Came In Today
>>>
>>>
>>> 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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>>>>>
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