[Elecraft] K3S XREF GPSDO recommendation needed

[Bob]

The spec's are in the K3EXREF  manual I have dated August 2016,
Rev B. page 4


"Connect the external 10 MHz signal source to the 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."

73,
Bob
K2TK ex KN2TKR (1956) & K2TKR





On 6/5/2018 3:31 PM, Grant Youngman wrote:
> My Trimble Thunderbolt puts out +7 dBm.  The Bodnar can be set for +13-something down to +7.7 dBm.  Sounds in the ballpark.
> 
> The Trimble hasn’t torched anything.  I don’t recall seeing specs on maximum input power for the K3 but I haven't looked at it for a while, have a short memory, and they’re probably there somewhere in the paperwork …
> 
> 
> Grant NQ5T
> K3 #2091, KX3 #8342
> 
>> Can the Bodnar be fed to the K3s directly bu jumper without attenuation?  Just verifying.  Don't want to feed too high a signal and torch something.  :)