<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p><br>
</p>
<p>Guy,<br>
</p>
<p>Never been on the Collins listserver<br>
</p>
<p>A connector is only good for RF if it makes a good connection.
For AF use, the phono connector might be OK since impedance are
high (say 10k ohms). But for RF, the impedance is typically
lower, so a good contact is more important <br>
</p>
<p>I hold that phono plugs with their sleeve-fit flanges don't make
as good a connection as something screwed on (PL-259) or twisted
on (BNC). For males, if you bend the flanges inward every time
you insert, then maybe they're OK. As for the females, if you
insert the male a bunch of times, the center wings on the female
gets expanded and the contact is not good. You'll have to 'pop
the hood' and bend the wings back together. All in all, I think
phono connectors are good only for one-shot use. <br>
</p>
<p>Chris, KL7DM<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 10/9/2021 12:52 PM, Guy Giacopuzzi
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:abee565b-793d-0981-4b2c-47c025edb960@js-net.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Chris, <br>
</p>
<p>I thought we had a discussion about RCA connectors on the
Collins listserve; I thought the consensus was that RF wise,
they were fabulous. The main issue is the females wear out, and
getting good ones to replace the ones you have is a bit of a
problem now...am I wrong?<br>
</p>
<p>Guy</p>
<p>...one of the hams at Heath...</p>
<p><img src="cid:part1.CA6E8E42.C8D1A169@aol.com" class=""
border="0"></p>
<blockquote type="cite"
cite="mid:e0748e72-e17a-f94a-df04-8dce07b1ec6b@aol.com">
<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">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<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>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Heath mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Heath@puck.nether.net" moz-do-not-send="true">Heath@puck.nether.net</a>
<a class="moz-txt-link-freetext" href="https://puck.nether.net/mailman/listinfo/heath" moz-do-not-send="true">https://puck.nether.net/mailman/listinfo/heath</a>
</pre>
</blockquote>
<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
<table style="border-top: 1px solid #D3D4DE;">
<tbody>
<tr>
<td style="width: 55px; padding-top: 13px;"><a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon"
target="_blank" moz-do-not-send="true"><img
src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif"
alt="" style="width: 46px; height: 29px;"
moz-do-not-send="true" width="46" height="29"></a></td>
<td style="width: 470px; padding-top: 12px; color:
#41424e; font-size: 13px; font-family: Arial,
Helvetica, sans-serif; line-height: 18px;">Virus-free.
<a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link"
target="_blank" style="color: #4453ea;"
moz-do-not-send="true">www.avast.com</a> </td>
</tr>
</tbody>
</table>
<a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1"
height="1" moz-do-not-send="true"> </a></div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Heath mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Heath@puck.nether.net" moz-do-not-send="true">Heath@puck.nether.net</a>
<a class="moz-txt-link-freetext" href="https://puck.nether.net/mailman/listinfo/heath" moz-do-not-send="true">https://puck.nether.net/mailman/listinfo/heath</a>
</pre>
</blockquote>
<div class="moz-signature">-- <br>
<br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Heath mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a>
<a class="moz-txt-link-freetext" href="https://puck.nether.net/mailman/listinfo/heath">https://puck.nether.net/mailman/listinfo/heath</a>
</pre>
</blockquote>
</body>
</html>