[Elecraft] K3s BG7TBL 10 MHz reference with K3EXREF

[Jarmo Blomster]

Hi Gary,

In my unit the ALM led is off, GPS LOCK lit continuosly and RUN led on/off
frequency is 1s.

Can you monitor the nmea messages from the serial port, is it tracking the
satellites?

73 de Jarmo, OH8KVA


2016-03-18 21:46 GMT+02:00 Gary Smith <Gary at ka1j.com>:

> Today was a pleasant surprise, the BG7TBL GPS Disciplined Oscillator,
> external reference arrived and much faster than I expected China Post
> to provide. There is no software or tech manual that comes with it so
> I didn't know what to expect. There are 3 LEDs an ALM, GPS Lock &
> Run. No idea what to expect with these & a web search did not lead me
> to a manual.
>
> This one is listed with the 2015-09-17 date (Version) stamped on the
> front. Ebay # 331800738725 - It contained the GPSDO, antenna and 12V
> wall wart. The GPS is a U-blox NEO-6M-0-001 and the OXCO is a
> Oscilloquartz 8663-XS dual oven. Reading the stats on the stability,
> it's pretty amazing, search down for the 8663:
>
> http://tinyurl.com/h4j58ea
>
> There's some interesting and lengthy discussion about this series of
> GPSDO on the eevblog site. Interestingly, the OXCO in this version of
> the unit is different than listed on the master reference on the
> first page:
>
> http://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/
>
> I did find the ALM LED remained on for 20 minutes or so and with a
> GPS lock (maybe one minute) the LED came on and remains on. The Run
> LED flashes around 3 times/second. Not sure what the flashing
> represents.
>
> I attached it to the K3EXREF and followed the directions to enable it
> in REF-CAL, in configuration. The effect wasn't immediately obvious
> but when I went to copy RTTY there was an apparent improvement to the
> copy in MMTTY and after transmitting, it seems like the recovery to
> copy is much faster than before. I'm looking forward to trying some
> of the digital modes and am happy this reference is engaged and the
> stability will be kept to the minimum needed.
>
> One thing I am wondering is how often the K3s utilizes the 10 KHz
> info being provided. I think I read every 4 seconds or so but I'm not
> sure I have that right. Nifty little piece of equipment to work with
> the K3/K3s
>
> Hope some find this info useful.
>
> 73,
>
> Gary
> KA1J
>
>
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