Today's Message Index:
----------------------
1. 01:29 PM - Re: questions on antennas (ROBINFLY@aol.com)
2. 02:48 PM - Re: Avionics-List: Re: questions on antennas (Dennis O'Connor)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | re: questions on antennas |
--> Beech-List message posted by: ROBINFLY@aol.com
I always have one com that is stronger than the other. While I have the
floor board removed (these are bottom mounted antennas), I decided to check
the contact between the antennas and the skin. I found the weak com's
antenna cable was shorted in the connector (so much for the $2K installation
labor for one GPS/Com w/ new antenna & calbe I paid 2 years ago). I did not
remove the antennas, but "ohm" the antenna connectors' shield (ground?) and
A/C skin and both read .2 ohm.
I also found that when I "ohm" the coax connectors on both antenna (not on
cable), the weak com antenna has no connection between the center and shield
(ground?) but the good com antenna reads .4 ohm between the center and
shield. Does it sound right? If the good com antenna and the A/C ground are
connected (w/ .4 ohm), how can it be the "good" com antenna?
Robin Hou
E35 Bo,
N7303B
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Avionics-List: re: questions on antennas |
--> Beech-List message posted by: "Dennis O'Connor" <doconnor@chartermi.net>
this is a topic that could become a text book...
First, I suggest that you interchange the antennas to the radios... Move the
weak antenna/coax to the strong com, and the strong antenna/coax to the weak
com and see if anything changes...
Report back and we can discuss it..And yes, both antennas could be fine even
though one shows an open connection for DC and the other shows. 0.4 ohms due
to different internal construction...
Denny
----- Original Message -----
From: <ROBINFLY@aol.com>
Subject: Avionics-List: re: questions on antennas
> --> Avionics-List message posted by: ROBINFLY@aol.com
>
> I always have one com that is stronger than the other. While I have the
> floor board removed (these are bottom mounted antennas), I decided to
check
> the contact between the antennas and the skin. I found the weak com's
> antenna cable was shorted in the connector (so much for the $2K
installation
> labor for one GPS/Com w/ new antenna & calbe I paid 2 years ago). I did
not
> remove the antennas, but "ohm" the antenna connectors' shield (ground?)
and
> A/C skin and both read .2 ohm.
>
> I also found that when I "ohm" the coax connectors on both antenna (not on
> cable), the weak com antenna has no connection between the center and
shield
> (ground?) but the good com antenna reads .4 ohm between the center and
> shield. Does it sound right? If the good com antenna and the A/C ground
are
> connected (w/ .4 ohm), how can it be the "good" com antenna?
>
> Robin Hou
> E35 Bo,
> N7303B
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|