YES... or what my 30L1 books says... 5th Edition, 1962.
Got a later book or service bulletin that shows the change?
On Jan 2, 2012, at 3:10 PM, Glen Zook wrote:
No!
The 30S-1 recommends a length of 20.5 feet but the specification for the 30L-1
was changed to basically any length of cable with 48 inches being the generally
accepted length of RG58/U because that same 48 inch length is used between the
S-Line receivers and S-Line transmitters for the heterodyne oscillator
connections and PTO connections. The 48 inch length between the units
generally requires no realignment when the receiver and transmitter are
connected as opposed to using the 100 ohm "dummy load" which is otherwise
connected to the heterodyne oscillator jacks when the units are not connected
together.
The 20.5 foot length of cable with the 30S-1 was selected to improve IMD, etc.,
and not to "match" the transmitter to the amplifier.
Glen, K9STH
Website: http://k9sth.com
From: R. Morris <robrk@nidhog.net>
To: amps@contesting.com
Sent: Monday, January 2, 2012 12:43 PM
Subject: Re: [Amps] Length of coax from xcvr to amp affecting input swr.
On 12/31/2011 09:04 PM, Charles Harpole wrote:
> This is a common phenomena and many amp users see it with a variety of amp
> makes and models. Alpha recommends 3 feet, and that works great. There must
> be another magic length longer than 3 feet, but only cut and try will tell
> you, but I would much rather change coax length than dig into the amps. 73,
> HNY
>
> Charles Harpole
> k4vud@hotmail.com
> > From: jim.thom@telus.net
>
Collins wants 20.5 feet of RG58 to their 30L1.
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