[Elecraft] K3EXREF and NavSync CW12-TIM GPS Module

[Matt Zilmer]

If Howard is correct on the output level, it's a little low for the
K3EXREF's input.  From the manual:

Connect the external 10 MHz signal source to the K3 rear panel REF.
connector. The 10 MHz source should have a signal level between +4 dBm
and +16 dBm, nominal. For square wave sources, 2VDC to 3.3VDC peak is
optimum. If the source is a 5V logic level, use a 50-ohm resistor in
series with the input. Caution: To avoid damage to the K3EXREF, do not
exceed these levels.

Many K3EXREF users have Trimble Thunderbolt units.  These work quite
well and have an output level of about 12.5 dBm, sine wave.
Thunderbolt units can be acquired surplus for $40 - $100 and are
readily available on eBay, etc.  I'd recommend you buy one of the
later models, because these have an integrated 12V-input power supply.

73,
matt W6NIA

On Wed, 8 Jan 2014 10:00:46 -0600, you wrote:

>This is an inquiry I sent to Elecraft, along with their response:
>
>I’ve been considering adding the K3XREF to my K3. Can you tell me if the device listed in this link is a suitable 10MHz source? (Re: Navsync CW12-TIM GPS Timing Module. Price and technical details at the link:)
>
>http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=41718
>
>Thanks,
>
>Jon / KF5TFJ
>=====
>Jon,
>
>We have not tested that unit with the K3XREF.
>Looking at the specs,  it's uses a square wave (most use a sign) and the output is a little higher output then 0dBM which most units use.
>I would recommended asking on our Elecraft reflector if anyone has used and tested it with the K3.
>
>Regards
>Howard K6IA
>=====
>So, has anyone used the CW12-TIM with K3EXREF?
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