[OZAPRS] Maxon DM-2550 Carrier Detect out?

Peter VK1NFI vk1nfi at netspace.net.au
Wed Dec 20 09:13:34 EST 2006


I have also heard and seen that some of the Maxon units, do not have 
sufficient output to reliably drive the CD on the Tiny Tracks and other 
similar units.  A simple pre amp from Jaycar shoehorned in usually fixes 
the problem.

Pete VK1NFI

Mike Townsend wrote:
> Howdy,
> If I recall correctly this pin is floating. You can check it for correct

> Carrier Detect action with a ohmmeter between pin 6 and earth as a
carrier 
> comes and goes it should switch between low and high or is it high and
low 
> ohms. Also if you play with the squelch, the pot on the lower board that
is 
> adjusted by dropping a suitable tool through the hole on the upper board

> between the two flexi cables you should also be able to toggle pin 6 CD 
> output.
> If you connect the pin to a 5v rail through a 10k resistor you should
then 
> see it toggle with a voltmeter. This is how I coupled it to a
Tinytracker 
> and then selected 'Invert CD IN' in the Config application.
>
> Mike, VK2INT.
>
> ----- Original Message ----- 
> From: "Michael Carey" <michaelcarey at internode.on.net>
> To: "VK / ZL APRS Users" <ozaprs at aprs.net.au>
> Sent: Tuesday, December 19, 2006 12:26 PM
> Subject: [OZAPRS] Maxon DM-2550 Carrier Detect out?
>
>
>   
>> Hi Everybody,
>> I've got a Maxon DM-2550 (bought from Garry Nosworthy) which I'm about
>> to pair up with a WXTrak at my local club station. In the service
>> manual, it mentions that Pin 6 on the 9-pin connector is Carrier
Detect.
>> But my DM-2550 doesn't seem to toggle this pin when receiving a signal.
>> Is there something I need to do to enable this? There is mention in the
>> PDF. that Power Save mode can only be used when CD isn't being used. Do
>> I need to reprogram my unit?
>> Regards,
>> Michael Carey
>> VK5ZEA
>> _______________________________________________
>> Ozaprs mailing list
>> Ozaprs at aprs.net.au
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>>
>>     
>
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>   

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