[K4RY] POSTPONED - New Repeater Installation

[John Klingelhoeffer]

Just a reminder, Chase;

It is pretty well established that the duplexer assembly for the two meter
repeater has something 'wrong' with it on the receive side.  When this
problem asserts itself, the repeater can be used on campus, but has
problems hearing any mobiles past the junction of AL147 and US280 (The
Bottle), and probably not far out Pepperell Parkway.  Students using just
handie-talkies inside of buildings appear to be adversely affected, too.
When the problem isn't there, the repeater can be used as far north as just
south of Dadeville, and easily from an HT out at Tigertown.

This duplexer system problem is an on or off thing, so it is likely either
corrosion or mechanical damage inside the cables or the duplexer cans
themselves.  Dr. Hung and I saw the on-off nature of this problem 4-5 years
ago when trying to troubleshoot the lack of sensitivity for the repeater.
The duplexer will need to be *removed* from Haley Center to be properly
examined and fixed.  A fix in-place is very unlikely, and should not be
tried.

AUARC has had a recent offer from local hams Dan, KK4ICE, and Lee, KE4COL,
to examine and potentially repair the duplexer assembly (if it is a *minor*
problem, corrosion, broken solder joint, etc!), and retune it for the
Club.  However, the duplexer and connecting cables will need to be
disconnected, brought down, and delivered to them.  This includes the
connecting cables, because they could be the source of the problem on the
receive side, too.  (Note:  the cables between the duplexer resonators
should not be removed, because they are critical lengths to make the unit
work properly).

This has been a recurring problem on the two meter repeater for at least
ten years, maybe more.  I confirmed that with members of the Club who had
been on campus circa 2004-2006.  Changing out the repeater itself may be a
good time to get the duplexer assembly in shape for another 20 years.

73

John...
WB4LNM

John H. Klingelhoeffer
AUARC since 1971





On Tue, Jan 24, 2017 at 2:59 PM, Remington Harrison <
rch0012 at tigermail.auburn.edu> wrote:

> All,
>
>
> The door to the repeater room on top of Haley Center is jammed shut. A
> work order has been placed to repair this. Hopefully it will be fixed
> promptly so that we can get and replace these repeaters soon. We will
> tentatively reschedule the repeater installation for next Tuesday (1/31).
> We will also not have a regular meeting tonight.
>
>
> Please let me know if you have any questions. Sorry for the delay.
> -R. Chase Harrison KO4LA
> chase at auburn.edu
> 256-527-2011
>
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>
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