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<p>Heathkit back then used phono connectors a lot, probably because
they were cheap. They are not the best connectors to use for RF.
The sleeve-fit ground makes for lousy connections. <br>
</p>
<p>Since the coax cables are not carrying any appreciable power,
just about any well-shielded cable will work. The impedance is
not an issue for anything less than say 6 feet. The reason for the
coax is to keep the RF isolated, not to match anything. Don't
use audio coax cable simply because the shielding is not very
good. <br>
</p>
<p>RG-8X is pretty thick and stiff. It will work but be cumbersome,
plus you'll have a helluva time trying to solder on the phono
plugs. If you're still worried about impedance, use RG-58<br>
</p>
<p>One of the major drawbacks of the SB104 is that it lacked RIT
(receiver incremental tuning) and XIT. To have a separate VFO
just to accomplish this simple feature is overkill. I built
RIT/XIT into my much older HW-101 (similar solid state VFO) pretty
easily with a varactor, a pot, and some switching circuitry. <br>
</p>
<p>Chris, KL7DM<br>
</p>
<div class="moz-cite-prefix">On 10/8/2021 2:54 PM, Steven Feinsmith
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGJMgmU537aamCbTvwMmFAEMTXcfTQ+bwjACP5twdEcJePxEMg@mail.gmail.com">
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<div dir="ltr">I acquired Heathkit Ham radio and worked on my
technician and general exams to earn the callsign soon.<br>
<br>
I cleaned my SB-644A, Remote VFO, and checked everything to
ensure it was in good working order. I have a pair of shielded
coaxial cables to link with my Heathkit SB-104A transceiver.
Both ends use RCA male phono connectors. I realized they were
short, a foot long. They cannot reach the remote VFO unless I
have put them on the left instead of the right. I checked the
assembly manual, and it showed that #343-3, a large, coaxial
cable, came 4 feet long. It has cut to 2 feet long instead of
one foot long. I decided to get a new coaxial cable. The
original cable labeled as follows:<br>
<br>
300V 80 degree FR-1 (UL) AWN STYLE 1436<br>
<br>
I searched for the specification for that cable. Unfortunately,
there was almost no information such as 50-ohms? I called three
different vendors, and they did not know much about it. I think
I can use RG-8x coaxial cable, but I am not sure if this kind of
cable can be attached with an RCA male connector? What is your
suggestion?<br>
<br>
73,<br>
Steven<br>
</div>
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