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 ;-)
>
> ________________________________
> From: rick darwicki <n6pe@yahoo.com>
> To: AMPS <amps@contesting.com>
> Sent: Sunday, October 7, 2012 3:24 PM
> Subject: [Amps] 300 W single band mobile amp needed
>
> I have a friend that runs a motorcycle mobile on 20 Meters at about 100
> watts. He is looking for a schematic/info/link for a simple no tune amp of
> about 300W that would just cover the SSB section of 20. Any help?
>
> Thanks
>
>
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