[aprssig] Green light labs gps

[KF4LVZ]

On 2015-08-28 13:12, Stephen H. Smith wrote:
> On 8/28/2015 10:52 AM, KF4LVZ via aprssig wrote:
>> On 2015-08-28 04:15, Stephen H. Smith via aprssig wrote:
>>> On 8/27/2015 10:46 PM, Dale Urban via aprssig wrote:
>>>> I have a green light labs gps that I used on my Kenwood D-710. I would
>>>> like to use it on my D-700 so I would need to supply power through the
>>>> RJ-45 jack. Would anyone know what the pinout is of the RJ- 45 jack on
>>>> this gps and which pin is pin 1 and pin 8 Thanks Dale N0KQX
>>>>
>>>> Sent from my iPad
>>
>>>>
>>>
>>> Since the D700 and D710 use the same standard Kenwood pinout for their
>>> RJ-45 mic jacks, it should be trivial to power it.
>>
>> The D700 and the D710 don't use the RJ45 for the same purpose.  The
>> control head on a D700 is a 4-conductor (4P4C) modular connector while
>> the D710 has the 8-pin (8P8C) RJ45.  In this case he's asking about the
>> RJ45 on the control head where the Green Light Labs GPS typically mounts.
>>
> 
> OOPS!  I totally forgot that the mic jack on the 710 is on the chassis,
> not the control head, and that the RJ on the head has a totally
> different pinout!
> 
> 
> I HAVE successfully powered modern low-power low-current-drain GPS units
> from the mic jack of the TM-D700 and TM-D742.  I have a variation of
> this device
> 
> <http://WA8LMF.net/TinyTrak/index.htm>
> 
> that has a RJ-45 Kenwood mic plug on a 6" pigtail on one end and a
> Kenwood mic jack on the other.  The box inserts in-line between the
> original mic and the radio's mic jack.  The TT3 and the attached GPS are
> powered by the DC on the mic jack. I make a point of using a
> NON-illuminated mic to make enough current available for the added
> hardware.

That's certainly a very low power GPS and looking at the link I see why
you're able to squeeze it in there if the guts are the same.  Are you
using a 5 volt regulator in your modified version?