[Hallicrafters] Dummy antenna for S40 alignment

[Al Parker]

hi guys,
    The main thing you wanta do is set up the rcvr for what impedance you
plan to feed into it.  If the S-40 has no antenna trimmer, then you can't
do any adjusting other than your alignment, e.g. SP-600.  If it does
you've got some leeway. (don't stop hr)
    A resonant antenna is resonant on only a very narrow band of freqs.,
whether it has a balanced, open wire feedline, or what. So, elsewhere, the
impedance is gonna be off, sometimes way off.
    What you really wanta do is use an antenna tuner for your receiver if
you're "band cruising" no matter what antenna you use.  You've either
gotta tune the antenna system to the rcvr or the rcvr to the ant. sys.
    I've done it, and demonstrated it to others, with SP-600's.  Any wire
is gonna be a very high, or very low impedance in many places across the
SW bands.  You can hear something then, but if you use a tuner and adjust
it to feed the rcvr in the imp. range it expects, just like "we know" we
hafta do with a transmitter, you'll hr more.  tuner - that's how you get
the best transfer of energy, rcvg or xmtg.
    that's my story & I'm stickin to it.
73,
Al the grouch
W8UT

----- Original Message ----- 
From: "Craig Roberts" <crgrbrts at verizon.net>
To: "Edward B Richards" <zuu6k at juno.com>; "hallicrafters"
<hallicrafters at mailman.qth.net>
Sent: Friday, December 10, 2004 5:19 PM
Subject: Re: [Hallicrafters] Dummy antenna for S40 alignment

>
> I was actually toying with the idea of building an old style open feeder
> line doublet, per Army instructions, for my Hammarlund SP-600 (which has
> a 100 ohm input impedance) and seeing if it would make any discernable
> difference.  Does anyone feed their antique receiver with an antique
> resonant antenna?  If so, how's it work?
>
> 73,
>
> Craig
> W3CRR