[Amps] Mobile amp

[Will Matney]

Jack,

I'm not for sure who's making them any more. Henry used to make a good one and I don't know if they have any left or not. They were really well made, or the ones I've seen.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 8/14/05 at 3:07 PM Jack wrote:

>Who makes the best mobile amp? 500watt range
>
>----- Original Message ----- 
>From: "Will Matney" <craxd1 at verizon.net>
>To: <amps at contesting.com>
>Sent: Sunday, August 14, 2005 12:56 PM
>Subject: Re: [Amps] Mobile amp
>
>
>> Bill,
>>
>> What I seen there were the two sets of input and output transformers, a 
>> splitter on the LH side (smallest toroid), and the combiner on the RH
>side 
>> (largest toroid). On the input transformers, they're the small size on
>the 
>> LH side and the output transformers are the longer ones on the RH side. 
>> There's two each of these. It's hard to see the transistors as they have 
>> them "strapped" with some copper strip or braid across the emitters.
>From 
>> that, I cant tell for sure if they have the transistors biased or not. A 
>> lot of times a fan isn't needed if the heatsink is large enough. Adding 
>> one wouldn't be a problem I wouldn't think. One may have to make a new 
>> cabinet where it would be large enough to handle a filter board and
>maybe 
>> a fan on the bottom. This is what they call a "high drive" type and
>would 
>> be what an amateur needs. The input power then could be up to say 80-100 
>> watts as you'd be driving 4 transistors or two push-pull sets. The low 
>> drive types have a driver transistor(s).
>> That has a variable attenuator on it but I'd say it dont do much for the 
>> SWR between it and the transceiver.
>>
>> Best,
>>
>> Will
>>
>> *********** REPLY SEPARATOR  ***********
>>
>> On 8/14/05 at 11:38 AM Bill Aycock wrote:
>>
>>>Will-
>>>Several peculiarities- This thing is small- if I compared right, it's
>only
>>>about 5 inches wide. The text says it's for 40M to 10M, which, if true,
>>>means it is "no tune". I would bet it is 11M, but there are a LOT of
>>>Ferrite cored assemblies, of several sizes. The heat sink is full length,
>>>but there is no fan.
>>>If anyone can identify it, it would solve some puzzles. I'm curious.
>>>Bill
>>>
>>>
>>>At 06:35 AM 8/14/2005 -0400, Will Matney wrote:
>>>
>>>>I ran across this on ebay for any who might want to convert an 11 meter
>>>>mobile over to an amateur amp. I don't know who's building these as this
>>>>brand is a new one on me but by the looks of the inside, it's made
>pretty
>>>>good. It doesn't say what the transistors are but most likely 2SC2879's.
>>>A
>>>>larger cabinet would be needed if installing a filter board. I can't
>tell
>>>>what class this amp is but may be class C. That can be converted easy by
>>>>adding a bias circuit for each set of transistors. At least this one
>uses
>>>>an etched board with heavy traces. The splitter and combiners cores are
>>>>the correct size too. For any interested, below is the link;
>>>>
>>>>http://cgi.ebay.com/Trucker-450v-Linear-Amp-Excellent-Condition_W0QQitemZ5798809242QQcategoryZ48700QQrdZ1QQcmdZViewItem
>>>>
>>>>
>>>>
>>>>Best,
>>>>
>>>>Will
>>>>
>>>>_______________________________________________
>>>>Amps mailing list
>>>>Amps at contesting.com
>>>>http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>Bill Aycock - W4BSG
>>>Woodville, Alabama
>>>
>>>
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>>>Amps at contesting.com
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>>
>>
>>
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