[Elecraft] External 10 Mhz reference level

[Edward R Cole]

+4 to +16 dBm (2.5mw to 40mw).  It's stated  on last page of kit 
instructions (I don't have a copy of the current manual as I was a 
beta tester).
but look here: http://www.kl7uw.com/K3EXREF.htm

I use a 10-MHz amplifier with four 10 dBm outputs made by DEMI:
https://www.downeastmicrowave.com/searchresults.asp?Search=10-4&Submit=

I built the kit into my own enclosure.  My OCXO is Russian surplus 
obtained from e-bay for about $45.  I outputs +7 dBm but has strong 
2nd harmonic which the DEMI amp filters out.  I lock two transverters 
in addition to my K3.

+10 dBm would be a good target level for driving the EXREF.  Be sure 
to check CONFIG: REF CAL for blinking asterisk between REF and 
CAL.  That indicates that the radio is under EXREF control.


=========================================

From: Grant Youngman <ghyoungman at gmail.com>
To: k4to at arrl.net
Cc: Elecraft Refl <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] External 10 Mhz reference level
Message-ID: <9E98B46E-4C39-432E-B9EA-D14139DA508A at gmail.com>
Content-Type: text/plain;       charset=utf-8

It?s in the K3XREF manual.  +4 to +16 dBm.  Your reference doesn?t 
have enough output.

Grant NQ5T

 > On Nov 21, 2019, at 3:33 PM, Dave Sublette <k4to.dave at gmail.com> wrote:
 >
 > I have a K3s, delivered in January this year.  I am using an external GPS
 > disciplined 10 Mhz reference to the External Ref input on the back.  I
 > cannot find anywhere in the manual what the required level for this input
 > is.  I have -1.1 dBm and it seems to work.  However, once in a while, the
 > K3s frequency shifts down 10 hz, then back to the original frequency, then
 > up 10 hz, then back to original frequency, all in a matter of two t four
 > seconds.   This happens maybe once a week and lasts for a minute or two.  I
 > have never heard it do more than one sequence of  down-back-up-back at
 > time.
 >


73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com