[Elecraft] Bodnar GPS Question

[Joe DeVincentis]

I have one of these and set it to 8mA output for several years with no problem.  I chose it based on the following:

From the K3EXREF manual

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.

From Bodnar’s website:

Both output signals are at 3.3V CMOS levels with 50 Ohms characteristic impedance. Their output drive levels can be adjusted.
Output power level (measured at 10MHz, fundamental power channel):

+13.3dBm, drive setting 32mA
+12.7dBm, drive setting 24mA
+11.4dBm, drive setting 16mA
+7.7dBm, drive setting 8mA


Joe, KO8V


> On Feb 14, 2019, at 2:36 PM, Dave Van Wallaghen <dave at w8fgu.com> wrote:
> 
> Grant,
> 
> I just bought one of those a few months ago. I don't have it in front of me, but as I remember, the default output from the Bodnar unit was exactly in range of what is required by the K3. I didn't have to change anything in the setup to get it working correctly with my K3.
> 
> HTH
> 
> 73,
> Dave W8FGU
> 
> On 2/14/2019 1:35:59 PM, "Grant Youngman" <ghyoungman at gmail.com> wrote:
> 
>> To reduce the overall footprint of “stuff” around here, I’ve purchased a Bodnar GPS to replace a Trimble Thunderbolt, open frame power supply, and status display for use with my K3.
>> 
>> Is there a recommended output level from the Bodnar for the K3?  it seems the lowest level should work ok, but just checking in case I don’t understand something .. which is probably more likely than not.
>> 
>> 
>> Grant NQ5T
>> K3 #2091 KX3 #8342
>> 
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