Re: {Collins} 30L-1 input coax

There was a very nice technical article on the 30L-1 written by Don Jackson
in the Q4 2013 Signal which explains the 20.5' cable.


David Harmon
CCA 97-535
Sperry, OK

-----Original Message-----
From: Collins [] On
Behalf Of Michael F. Sear
Sent: Wednesday, November 12, 2014 1:14 AM
To: 'W. Harris'; collins@xxxxxxxxxxxxx
Subject: Re: {Collins} 30L-1 input coax

To All,

The Collins instruction book/manual for my 30L1, 3rd edition,15 August 1961,
states in the various interconnection diagram notes " THIS CABLE IS

There must have been a reason for the Design Engineer to be so clear with a
specific note for all equipment Rf input interconnection options including
the KWM-1. All the other RCA interconnection cables are obviously shorter
and would seem to rule out a remote location option. Probably has to do with
what the input circuit wants to see from the exciter. 

If anyone has some specific insight on the "as designed" 20.5 Ft. OEM cable
it will be appreciate. For now I will continue to use the 20.5 ft. RG-58 C/U
cable per the instruction book. 


Mike N7TLL
CCA AC94-10293

-----Original Message-----
From: Collins []
On Behalf Of W. Harris
Sent: Tuesday, November 11, 2014 9:35 PM
To: collins@xxxxxxxxxxxxx
Subject: Re: {Collins} 30L-1 input coax

The proper length of coax from the 30L-1 and the transmitter/transceiver is
the shortest length that will reach.

Bill - K5MIL

--Forwarded Message Attachment--
From: domanico88@xxxxxxxxxx
To: collins@xxxxxxxxxxxxx
Date: Mon, 10 Nov 2014 13:51:33 -0500
Subject: {Collins} 30L-1  / 20.5 ' Cable

Hello again group.once again I get to draw on the vast knowledge of all the
Amateurs who participate in this listing. OK here is my question..this
pertains to the 20.5 Feet of RG-59U coax that Collins calls for between the
exciter and the amplifier ! Now on my first 30L-1 some 20 years ago i did
exactly just that and it worked out fine...on the one I now have i use about
5 feet of the same coax and it seems to work out fine..I would imagine one
advantage to the shorter coax is the fact that I get somewhat more RF to the
input of the amp.however, i am sure that is not necessary..there is enough
RF from the exciter to handle that even with some of the loss in the 20.5'
length.lets face it the amp only requires 70 watts at most to function
properly..So my question to all you electronic wizards out Do
you think the Distortion levels would be lower useing the 20.5' of RG-59U or
does it make any difference ?? Right now I have a 5' section of coax.but I
am wondering if i should replace it with the 20.5' of coax which I have here
Bill if your around..I would also appreciate some of your Professional
advice on this matter !
Thanks People
P.S. If I am not mistaken.i think Collins changed their views on the length
of coax between the exciter and amplifier.but that is a here say..I heard
that through the grapevines !

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