--- On Sat, 11/15/08, G Shaw <[EMAIL PROTECTED]> wrote:
> From: G Shaw <[EMAIL PROTECTED]>
> Subject: RE: [Repeater-Builder] OT: Stationmaster Pd-220
> To: Repeater-Builder@yahoogroups.com
> Date: Saturday, November 15, 2008, 9:51 AM
> Hi Ryan
> > One other point. You stated that you changed feedline from
> Heliax or other
> hardline to RG214. The difference between the two both on
> xmt and rcv is
> like NIGHT AND DAY. Assuming about 80 feet of run at VHF
> you have added
> well over 3 db of loss, which of course means your system
> is going to be
> deaf on rcv and way down on xmt E.R. power in real terms
> compared to on a
> good Heliax or other hardline. I would be betting on the
> feedline degrade
> but I would certainly run the antenna test to be sure.
>
> 73
> Glenn N1GBY
>
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Ryan
> Sent: Saturday, November 15, 2008 12:18 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] OT: Stationmaster Pd-220
>
> Hi Group,
>
> My club has a the never design Station master Pd-220 bought
> new in 1998.
> Antenna is top mounted ( Rohn 45G 50 ft.) The problem were
> having is the Rx
> went to crap since recent temperature season changes in PA.
>
> What has been noticed is the Rx is a bit deaf (MastrII with
> ARR Preamp at
> .050mv sens. and Wp-642 cans) Rpt was ruled out as the Rx
> levels are the
> same. and the TX is right on the money. There was a issue
> with the Hardline
> from a hungry critter and was replaced last week with
> RG-214 untill spring
> than run new hardline. thinking this was the problem
>
> Distance users that could get in with 5 watts or less with
> a 5-9 signal
> can't key up the Rpt with 50 watts in a 30 mile radius.
> We Have SWR of
> 1.8 across the 2meter band. Was 1.3 when checked in years
> past. Local users
> ( less than 5 miles line of sight) have noticed RX signal
> changes.
>
>
There is not going to be that much differance going from hardline to rg-214 as
far as loss. The hard line will loose 1 db and the 214 will loose 3 db. That
is a 2 db differance. That is for around 100 feet. It will be somewhat less
for the distance actually used.
Stations should not have to go from 5 watts to 50 watts for the same signal.
One thing to watch is that the 214 could be is single shielded and they are
getting desense from it being near the repeater.
I would think a swr going above 1.5:1 would indicate an antenna problem ,
especially if it is taken at the end of the coax and not at the antenna.
