piclist 2001\06\04\163237a >
Thread: Mystery Amplifier Inquiry
www.piclist.com/techref/index.htm?key=mystery+amplifier
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face BY : Chris Carr email (remove spam text)



>
> > At 10:03 AM 6/4/01 -0700, Barry Gershenfeld wrote:
> > > >Lunar Industries Inc
> > > >It is possibly designed to be operational on TV Broadcast Frequencies
> > > >Regards
> > > >Chris Carr
> > >
> > >I'm not sure why you said "TV" but maybe you read some additional
> > >information.  Now since the model said "VHF" my answer would
> > >be "VHF"...but a little further info...the company was started
> > >by an avid moonbounce enthusiast which kind of suggests 432 MHz.
> > >I was involved with some amateur TV which was around 434 MHz and
> > >that required an amplifier with a linear mode so they may have
> > >been able to use this one there too.
> >
> > In a ham context, VHF means 144-148  If it were 430, it would be
labelled
> "UHF"
>
> Well.....I beg to differ on this.  Anything above 50 Mhz is considered
VHF.
> (actually anything 'above' 49.99999 rpt, however some people will insist
> this is the same thing ;-D  The FCC says: NOT)
>
Actually VHF starts at 30MHz according to the CCIR or is it ITU-R these
days.


> >
> > >Of course, a lot of solid state amplifier designs were pretty
> > >broad band so it's likely it covers a lot more.   25/100 sounds
> > >like the power you'd get in classB/classC mode.
> >
> > Typically, they are rated with input/output power.
> >
I have the Company listed as providing broadcast TV Equipment. If the
Amplifier is for VHF then it is probably operating in TV Band 1 or TV Band 3
in the USA these extend from 54 to 88 MHz and 174 to 216 MHz..

Look at Band 1. An Amplifier with a flat bandpass (Amplitude and Group
Delay) of 34MHz centred on 71MHz whilst not impossible is very difficult to
obtain. Amplifiers in these bands are more commonly optimised for one 6MHz
channel. Hence my reason for mentioning that the Amplifier in question was
possibly for Broadcast TV  use.  I would doubt that such an Amplifier would
be suitable for the 2m Amateur Band. Although if it is centred on USA TV
Channel 4 it would be suitable for the British 70MHz Band.

Chris Carr

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