Elecraft

Bodnar GPS Question

Classic

List

Threaded

4 messages Options

Grant Youngman-2

Bodnar GPS Question

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

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Dave Van Wallaghen-2

Re: Bodnar GPS Question

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" <[hidden email]> 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
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Joe DeVincentis

Re: Bodnar GPS Question

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 <[hidden email]> 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" <[hidden email]> 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
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Grant Youngman-2

Re: Bodnar GPS Question

In reply to this post by Dave Van Wallaghen-2

Thanks everyone for the replies. I set it to the lowest output level (8 dB), and it appears to be working just fine.

Grant NQ5T
K3 #2091 KX3 #8342