[Amps] 300 W single band mobile amp needed

[Carl]

> On 07/10/2012 22:09, Hal W5GHZ wrote:
>> Whats is the point? Your friend is wanting a linear amplifier that has a 
>> narrow tuning range of 200 KHz, 14.150 MHz to 14.350 MHz., assuming he is 
>> an Extra.  Why does he want to eliminate the lower portion of the band? 
>> He could purchase an Ameritron 500 watt solid state amp and leave the 
>> band select switch in the 20 meter position.  He could then reduce the 
>> drive to the point that he only gets 300 watts out.  Then when he finds 
>> out that he is frying his brain operating with that much power only two 
>> feet from his head,  He can sell the amp to someone that can make more 
>> use of it.  His money would be better spent on improving the efficiency 
>> of his antenna.  I have always thought that a small trailer a few feet 
>> behind the bike with an antenna mounted in the center would give me a 
>> taller antenna with slightly more ground plane.  It would also reduce my 
>> exposure to RF.  It would also improve reception.  One could also put 
>> more batteries in the
>>  trailer and have more operating time at the camp site if he were going 
>> on a trip.  Then he could string out a dipole and run 500 watts and maybe 
>> 40 meter DX at night.  Now that makes much more sense.
>>
>>
>> However, if he really wants to spend the extra money for a custom made, 
>> single-band linear amplifier, I would be happy to design and build him 
>> one at a premium price.
>>
>> I assume that by "simple", your friend means cheap.  If that is the case, 
>> then I suggest he find a bootleg CB amp at the required power output. 
>> These amps are broadband 40-10 meter amplifiers with no filtering 
>> (cheap).  He would have to reduce the drive so as not to burn up the amp. 
>> They have no filtering so they might not meet FCC specs., however he can 
>> always build a 20 meter output filter if he values his license.  There 
>> are plenty of filter designs in the ARRL handbook.  I would think about 
>> putting a fan on an amp like this.
>>
>>
>> Hal W5GHZ
>>
>
> I find myself looking for the [Like] button to click ;-)
>

Yep, turning one of those CB amps into a relatively clean ham monobander is 
very easy. By "clean" I mean around the same poor mid to high -20's IMD of 
any 12V SS transceiver or legitimate ham amp.

With one of those its GIGO+

Carl
KM1H