[Mobile-Portable] Heavy Duty mobil mount that is quick disconnect availib...

Fri, 13 Jun 2003 21:46:29 -0500

 any pictures?

----- Original Message -----
From: [email protected]
Date: Friday, June 13, 2003 2:40 pm
Subject: Re: [Mobile-Portable] Heavy Duty mobil mount that is quick 
disconnect availib...

> The amp I built uses (8) 2SC2879's which are available from a 
> number of 
> distributors, such as RF Devices.  100 watts from my Icom 706 is 
> more than 
> sufficient to drive the linear amp.  You actually must be careful 
> not to overdrive the 
> amp by setting the transceiver mike gain too high.  I find that 
> about 50 
> watts of drive gives me full power. The transistors are utilized 
> in pairs, then 
> the pairs are combined using "Wilkinson" type ferrite combiners 
> (twisted pair of 
> enameled wires with ferrite beads on them or wound around a 
> toroid).  Each 
> pair of transistors is biased with it's own variable voltage bias 
> 0.4 to 1.5 
> volt supply to provide some isolation between the "pairs."  I have 
> a 12v muffin 
> fan that blows air over the amplifier heat sink and out the back 
> of the shoebox 
> size case the amp and bias circuit is built in.  My car is 
> equipped with a 
> dual 12v batt system in the car with a 130 amp alternator and of 
> course my home 
> brew antenna 12 1/2 foot antenna with the 6 inch diameter # 10 
> wire loading 
> coil . 
> 73, Terry K7FE
> 
> 
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