[600MRG] GPSDO continued -

[jrusgrove at comcast.net]

In most cases, an external GPS 10 MHz reference tied to a transceiver does not 
provide the same level of frequency accuracy that one expects from of a piece 
of test equipment or military receiver. The Elecraft K3 with external 
reference, for example, is only good to about 2 Hz ... a joke compared to the 
mHz / uHz (or better) accuracy and near perfect phase stability of test 
equipment or military receivers connected to a 10 MHz reference. 

Jay W1VD  WD2XNS  WE2XGR/2


p.s. before someone comments that mHz / uHz accuracy and perfect phase 
stability are not required for amateur work, please note that cutting edge weak 
signal modes like DF6NM Opera Deep Search and EbNaut (that can decode signals 
50 dB or better below the noise floor*) do require this level of accuracy / 
stability.

* referenced to a 2.5 kHz bandwidth     



----- Original Message -----
From: John Molnar <wa3etd at gmail.com>
To: k2ors <k2ors at verizon.net>
Cc: 600 / 630 Meter Group <600mrg at w7ekb.com>
Sent: 3/5/2017 1:18:19 PM
Subject: Re: [600MRG] GPSDO continued -


...per Warren comment - I have the XREF for a FT-857-D and it works better
than good! One of
those things that just works.

John XKA

On Sun, Mar 5, 2017 at 11:52 AM, k2ors <k2ors at verizon.net> wrote:

> Frank,Check the vk3hz.net website for info on using a 10 MHz GPSDO as a
> reference for rigs that are using other clock freqs.
> 73 Warren
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
> -------- Original message --------From: Frank Lotito <k3dz at live.com>
> Date: 3/5/17 11:14 AM (GMT-05:00) To: 600 / 630 Meter Group <
> 600mrg at w7ekb.com> Subject: [600MRG] GPSDO continued -
> OK, looks like the information I came across regarding the broadcast
> industry as a source for GPSDO modules was incorrect. Two questions - (1)
> "Who / what activity" is offering these modules for sale on the Internet
> sites? (2) As I understand these modules from the OEM web sites, a
> standard output is 10 MHz with a bunch of zeros to the right of the decimal
> point. I understand a very few amateur transceivers do use an on-board 10
> MHz clock, and they do have provisions for an external 10 MHz clock. What
> if your device, be it an amateur / commercial receiver / transceiver, or
> test equipment uses a reference time base oscillator other than 10.0000...
> MHz. Can someone suggest Internet articles that discuss frequency
> synthesizers using 10 MHz reference oscillators?
>
> 73 Frank Lotito K3DZ / WH2XHA
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