Albert,

In the 30-50 MHz band, the antennas for a portable radio must be cut for
proper operation, over a very narrow range of frequencies.  The length of a
whip antenna must be changed by 1/4-3/8 inch for every 1 MHz.  Motorola
still offers the NAB6064B "tunable" antenna for the MT1000 radio, which must
be cut to length for the specific frequency needed.  In other words, there
is no such thing as a broadband antenna for low band, and the radio's PA
could be damaged by using an antenna that is not the right length.  The
NAB6064B antenna costs about $23 from Motorola Parts.  Call 800-422-4210 to
order.

73, Eric Lemmon WB6FLY


-----Original Message-----
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Albert
Sent: Friday, July 10, 2009 12:56 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Building HT antennas



Hey guys, I posted this question over on the HT600e forum but didn't get
anything. I was wondering if anyone here could be of assistance.

I recently acquired a low band MT1000 for use on the 6m band. It has a nice
new commercial antenna but I was wanting to do something a little better. No
one that I can find supplies or can supply me with a better antenna for this
radio. Even smiley antenna, my usual go to company for custom antennas for
the Genesis line can't help me. So I was thinking of building my own.

My first thought, since the antenna connector on the MT1000 is basically a
1/4-32 hole, I could thread a piece of aluminum round stock to create a
base. Then I could just make a 1/4 wave whip from stainless rod. I know it
would be silly long but it is a start. If I do this, do you think I should
just use the standard 1/4 wave vertical formula? Would I need to compensate
for the HT's lack of a ground plane?

Any thoughts would be appreciated.

Thanks
Albert
KI4ORI





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