[OZAPRS] DM-2550 MAXON power vs voltage

[Andrew McDade]

Gday all,

Im wondering who has had actual experiences with their Maxon radios
blowing 
final transistors or other issues, by running them at voltages higher than

10.8V. It looks to me as though the spec on the max EC voltage on the 3
o/p 
transistor chain is 15v, and with quick TX time of generally less than 2 
seconds every few minutes, the final transistor wouldn't have time to warm

up very much. Just as a matter of interest Ive been using several Maxon 
radios running directly from the vehicle power , ie. ~ 14.2 volts , for 
quite some time, with no apparent issues yet !! .. ( Maybe they are on 
borrowed time !! )

Regards .. Andrew .. VK5EX


----- Original Message ----- 
From: "Andrew Rich" <vk4tec at tech-software.net>
To: "VK / ZL APRS Users" <ozaprs at aprs.net.au>
Sent: Saturday, October 07, 2006 6:24 PM
Subject: Re: [OZAPRS] DM-2550 MAXON power vs voltage


> Lab power supply
>
> -----------------------------------------
> Andrew Rich
> Amateur radio callsign VK4TEC
> email: vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
> web: http://www.tech-software.net
> Brisbane AUSTRALIA
>
>
>
> -----Original Message-----
> From: Sasi Nayar [mailto:sasidiver at yahoo.com.sg]
> Sent: Saturday, 7 October 2006 5:09 PM
> To: ozaprs at aprs.net.au
> Subject: Re: [OZAPRS] DM-2550 MAXON power vs voltage
>
>
> Gday Andrew
>  What kind of voltage regulator are you using to power your Maxon? I use

> an
> LM317 based ckt. I am looking for something better (low drop).
> 73
>  Sasi
>  VK5SN
>
>
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