[heathkit-yahoo] Heath HW-100 Plate Modulation Mod

[Bob Groh WA2CKY]

Well, Doc, you have got a tiger by the tail there. You might consider picking up a DX-100 or a TX-1 (Apache) - I believe both of these have plate modulation and are a comfortable 100W AM rig. Give you one more thing to play around with (although you'll have to use a winch to move the darn things around). Another alternative is buy a linear amplifier so you can use just about any size AM transmitter - hey, more tubes to glow brightly!  With a good (operative word 'good') amplifier, you could run 400W or so of AM and that should give you the punch you need. 

As a very general rule of thumb, you need a peak power capability of 4x the AM carrier rating. Just FYI.

Happy AM'ing!

73
Bob, WA2CKY

----- Original Message ----
From: kd4e <doc at KD4E.COM>
To: HEATH at LISTSERV.TEMPE.GOV
Sent: Tuesday, August 21, 2007 11:54:06 AM
Subject: Re: [HEATH-TEMPE] [heathkit-yahoo] Heath HW-100 Plate Modulation Mod

Bob,

    I am told that due to the nature of the mode and other
factors if I want reliable communications other than very
local (which I do) I need a minimum of 100W for AM - and
high-level plate modulation vs the lower-level alternatives.

    Presuming the predicate to be true I really need to sort
out the necessary mods to the HW-100 or some other more
amenable cw/ssb tube transceiver.

    At the moment the one component that worries me the most
is the three section air variable tuning cap -- not sure I
can fit a larger one in there!

Thanks!  doc

> Doc,   I'd recommend you get the back issue of Electric Radio #211 (Dec. 
> 2006). which describes exactly what you need with the exception of being 
> able to change back and forth between AM and SSB/CW easily.  Getting a 
> 2nd radio would be the way to go.   The author didn't report problems 
> with 25w of plate-modulated AM.
> http://www.ermag.com/
> 
> 73, Bob W9RAN


-- 

Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html

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