Today's Message Index:
----------------------
1. 11:07 AM - Two Radios, One Antenna (Robert L. Nuckolls, III)
2. 03:40 PM - Re: Two Radios, One Antenna (Thomas Barter)
3. 06:23 PM - Re: Two Radios, One Antenna (Jared Yates)
4. 08:51 PM - Re: Two Radios, One Antenna (Robert L. Nuckolls, III)
5. 09:06 PM - What's that beeping?? (Robert L. Nuckolls, III)
6. 09:41 PM - Whelen LED landing lights . . . (Robert L. Nuckolls, III)
Message 1
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Subject: | Two Radios, One Antenna |
Here's a refined concept of the device I was talking
about yesterday. The bill of materials for this gizmo
would be on the order of $50. It would have to sell
for $100 to $125 with mating connectors as a kit.
Seems like a lot of fuss to avoid putting a second
antenna on the airplane.
Bob . . .
Message 2
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Subject: | Two Radios, One Antenna |
My goal is to be able to connect the hand held to the antenna if the main
comm should be unusable. No duplexing needed. Would a device like the one
shown be suitable for the task? Feed the antenna lead into the common, and
connect the main radio to one output and the handheld jack to the other. I
realize that these devices are rated for certain frequency bands, and one
would need to be sure it was functional across the A/C comm range.
Tom Barter
-----Original Message-----
Here's a refined concept of the device I was talking
about yesterday. The bill of materials for this gizmo
would be on the order of $50. It would have to sell
for $100 to $125 with mating connectors as a kit.
Seems like a lot of fuss to avoid putting a second
antenna on the airplane.
Bob . . .
Message 3
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Subject: | Re: Two Radios, One Antenna |
If your feed line is routed in a way that makes a switch like that accessibl
e to you in the cockpit, can you just cut the feed line and crimp on two opp
osite sex BNC connectors? If your handheld has a BNC style connection for t
he antenna, just use the corresponding sex of connector on the antenna side o
f the splice. Normal operations would be with the connectors joined. If the
com goes TU, disconnect the joint and attach the antenna side directly to t
he handheld. This would be a very crude switch but you are not going to be c
ycling it frequently.
On Sep 2, 2011, at 18:36, "Thomas Barter" <kesleyelectric@iowatelecom.net> w
rote:
> My goal is to be able to connect the hand held to the antenna if the main c
omm should be unusable. No duplexing needed. Would a device like the one s
hown be suitable for the task? Feed the antenna lead into the common, and c
onnect the main radio to one output and the handheld jack to the other. I r
ealize that these devices are rated for certain frequency bands, and one wou
ld need to be sure it was functional across the A/C comm range.
>
>
>
> <image001.jpg>
>
>
>
>
>
> Tom Barter
>
>
>
> -----Original Message-----
>
>
>
> Here's a refined concept of the device I was talking
>
> about yesterday. The bill of materials for this gizmo
>
> would be on the order of $50. It would have to sell
>
> for $100 to $125 with mating connectors as a kit.
>
>
>
> Seems like a lot of fuss to avoid putting a second
>
> antenna on the airplane.
>
>
>
>
>
> Bob . . .
>
>
>
>
Message 4
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Subject: | Re: Two Radios, One Antenna |
At 08:20 PM 9/2/2011, you wrote:
>If your feed line is routed in a way that makes a switch like that
>accessible to you in the cockpit, can you just cut the feed line and
>crimp on two opposite sex BNC connectors? If your handheld has a
>BNC style connection for the antenna, just use the corresponding sex
>of connector on the antenna side of the splice. Normal operations
>would be with the connectors joined. If the com goes TU, disconnect
>the joint and attach the antenna side directly to the handheld. This
>would be a very crude switch but you are not going to be cycling it
>frequently.
I think this is the most elegant. We talked about this
on the List some years ago. The idea was to route the
comm antenna coax in such a way that a 'service loop'
was joined at some point in the middle by a male-female
cable pair of connectors. This loop might be just under
the pilot's knees in front of the seat. If the main radio
goes down, open this service loop and connect your HT into
the coax.
One builder made his service loop about 24" in circumference
on the cable-male end that fed the antenna. He didn't need
to carry an extension coax . . . he just opened the
connectors, un-coiled the loop and connected it to his
hand held.
We also discussed using a pair of right-angle adapters on
the hand-held antenna jack arranged so that the coax comes
up the back side of the hand held, makes two 90-degree
turns and drops onto the HT antenna jack.
This is a very low cost, very reliable means for sharing
duties on a single antenna.
Bob . . .
Message 5
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Subject: | What's that beeping?? |
See:
http://aeroelectric.com/Pictures/Misc/Whats_that_beeping1.wmv
Bob . . .
Message 6
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Subject: | Whelen LED landing lights . . . |
Bill Shank sent me his Whelen PLED1L landing lights
to get some performance data on them. The current draw
on these puppies looks like this:
Emacs!
They don't even start to draw current until 8.8 volts and
go into constant 1.2 amps constant current above 12.5 volts.
The flashers we used to use for wig-wagging the incandescent lamps
won't work with these devices. I'm developing a new recommendation.
At 1.2 amps per lamp, the current draw is quite nominal. This
product ought to open some new horizons for Rotax powered aircraft
that have not been able to support the legacy landing light
products.
2.4 amps for DUAL landing lights and 1.2 amps in wig-wag is
quite doable with the Rotax 18A alternator.
Watch this space . . .
Bob . . .
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