[Lowfer] Ultimate LOWFER Transmitter?

[W2MXW]

Thank you, Peter!

Now this is what I'm looking for...
I will address each point and note those which are already present on the 
mediumwave model thus would not need to be changed:

#  I agree w/ John's previous suggestion about frequency "agility,"
that's a must, and also right on top is stability to support the newer
forms of narrow communication modes.

This is do-able. Granted, no rubidium standards or anything :-) but it can 
be made both stable and agile, using a PLL of careful design with a good 
ref. xtal and quality components for example. Suggestions?
FSK ability could also be a possibility.

#  A means to measure and control final power output

Already has same.

#  A remote final amp. or a separate unit that could be housed at the
ant. and driven from the main unit. This could be another product or, of
course, be homemade by the op.

This would be do-able (although would require a major redesign). If 
homebrew finals were desired the unit could be more of a 'master 
oscillator' kind of thing. Keep in mind though that in such cases only the 
osc. would be Type Accepted, the homebrew finals of course wouldn't.

#  Antenna switching for an antenna-located amp. to allow tx/rx from
said antenna

This would be be possible esp. if the previous design suggestion were to be 
applied.

#  Static charge protection on the antenna side.

Already so equipped.

#  A basic auto keying feature, such as a location for the K1EL chip

Quite do-able. In fact this was something I myself was going to suggest.

#  PCB test points for "when in doubt" times

Already present.

#  A OSHA-like safety warning that use of said product can be harmful,
to check with counsel when as needed
Well, if bitten by the Lowfer bug then it may be harmful indeed, he'll have 
to include a sticker with suggested cures (not that they would likely be 
effective, or FDA approved! :-)

In all seriousness most of these suggestions are not only do-able but are 
already incorporated into the AM broadcast product on which the LF design 
would be based so no major changes would be needed in those areas.
Again, thank you Peter.

73, Jon W2MXW

At 03:43 PM 3/12/02 -0600, you wrote:
>Hi Jon,
>
>Boy you don't start out small with this "Ultimate LOWFER" features
>list. Looks like quite the project, but, as indicated, a history of
>other kit TX projects precedes this one.
>
>Unlike some other responses I won't dwell on the negatives or "should
>not dos," rather I'll choose a supportive vane and offer wishes as if I
>were at my mental drawing board making a generalized 1750M tx myself:
>
>#  I agree w/ John's previous suggestion about frequency "agility,"
>that's a must, and also right on top is stability to support the newer
>forms of narrow communication modes.
>
>#  A means to measure and control final power output
>
>#  A remote final amp. or a separate unit that could be housed at the
>ant. and driven from the main unit. This could be another product or, of
>course, be homemade by the op.
>
>#  Antenna switching for an antenna-located amp. to allow tx/rx from
>said antenna
>
>#  Static charge protection on the antenna side.
>
>#  A basic auto keying feature, such as a location for the K1EL chip
>
>#  PCB test points for "when in doubt" times
>
>#  A OSHA-like safety warning that use of said product can be harmful,
>to check with counsel when as needed
>;-}
>Peter, LWCA member
>------------------------------------------------
>
>Part of Jon's msg.
>
> >>> weatheradio@worldnet.att.net 03/12/02 12:20AM >>>
>Hi everyone,
>
>A Part 15 'colleague' of mine, Keith Hamilton of Hamilton Printed
>Circuit
>Board (PCB) Design, who manufactures FCC Certified Part 15 100 mW AM
>broadcast transmitters recently expressed the idea that he would like
>to
>manufacture a LOWFER transmitter based on his very successful AM
>transmitter design. Basically he would (within reason) like to make The
>
>Ultimate LF Transmitter.
><<klip>>
>[Jon details 13 points in all. See the orig post for remainder.]
>
>73, Jon W2MXW
>
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