[NLRS] Solid State 400 W 220 MHz Amplifier

[Dr. Gerald N. Johnson]

Being broad band, I'd think the filtering was a combination of a high 
pass to define the low end and a low pass to define the high end. Its 
difficult to pass 216 with decent phase response and stop 222, so there 
may be little need for changes for 222. Probably working at 144 will 
require removing or changing the high pass filter and its possibly 
associated impedance matching at the low end of the design band. There 
may be more than one each high pass and low pass, one each at input and 
at the output. And there's probably some RF feedback to adjust the gain 
over the range to keep the gain closer to flat. Some of that could be 
ascertained from the full schematics.

73, Jerry, K0CQ

On 11/2/2010 6:04 AM, Rex Greenwell wrote:
>
>
> Hello NLRS experimenters and technically inclined. -
>
> I am wondering if a technically savvy ham would like to spend some time
> testing out a potential 220 MHz (perhaps even 144 MHz) solid state linear
> amplifier?
>
> I have access to a few RCA Hi-Band VHF 400 W PEP CCS solid state amplifier
> assemblies.  These were designed as broad band linear amplifiers to operate
> between 174 to 216 MHz without tuning.  This is only several MHz from the
> 220 MHz amateur band.  I think there is a great possibility that these
> amplifiers could make great high power amps for that band.  It is also
> possible that they could be made to work at 144 MHz as well.
>
> I just haven't had time or access to a 220 MHz exciter to try this.  So I am
> looking for an interested ham with the technical know-how and resources to
> test this out.  You will need a 48 V DC power supply with a fairly hefty
> current rating and a fan to cool the massive heat sink.
>
> Is anyone willing to take this on?
>
> The amplifiers were used in a high power VHF channel 7 through 13 television
> transmitter.  Similar amplifiers for low band TV channels 2 through 6 are
> being used by hams as they make great six meter amplifiers.
>
> 73 Rex K0KP EN36vw
> ______________________________________________________________
> NLRS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/nlrs
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:NLRS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>