[amsat-bb] Leo Bodnar ICOM IC-9700 Reference Injection Board

[Bob Hammond]

This is a good explanation:

"With the current firmware, users have observed frequency drift when using
narrow bandwidth modes. Using an external 10 MHz and the firmware reduces
the size of the frequency drifts by updating the corrections to the master
oscillator more frequently. The drift is still there,,,,, With the 49.152
MHz injector board and a good external 49.152 MHz GPS-locked oscillator,
the external oscillator locks the internal oscillator and the drift issue
is eliminated. The drift is probably not important on FM and most may not
notice the issue on SSB. But it is important to eliminate the drift if you
are using JT65 and similar narrow bandwidth modes."

Copied from the Facebook ic-9700 group and a post by Peter Freeman in reply
to Tim Goodrich's question:
https://www.facebook.com/groups/163460540873662/

Bob W7OTJ

On Sat, Feb 15, 2020 at 1:53 PM Bob Hammond <propgrinder at gmail.com> wrote:

> Eric,
>
> I found much information on the design and benefits of a GPSDO and
> reference board for the IC-9700 here:
>
> https://www.minikits.com.au/gps9700#wspr
>
> The Mini-Kits version is only slightly different than the Leo Bodnar
> version however the designs are virtually identical.
>
>
> http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=301
>
> http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=352
>
> Bob W7OTJ
>
> On Sat, Feb 15, 2020 at 8:16 AM kd8drg.admin--- via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
>> I was wondering what the advantage is for using this board vs the
>> standard 10Mhz external reference on the 9700?
>>
>> 73
>> Eric
>> WD8KNL
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>