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nuckolls.bob(at)aeroelect
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 Posted: Fri Sep 02, 2011 10:07 am Post subject: Two Radios, One Antenna |
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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 . . .
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kesleyelectric(at)iowatel
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| Posted: Fri Sep 02, 2011 2:40 pm Post subject: Two Radios, One Antenna |
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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.
[img]cid:image001.jpg(at)01CC6996.C7E953F0[/img]
Tom Barter
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email(at)jaredyates.com
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| Posted: Fri Sep 02, 2011 5:23 pm Post subject: Two Radios, One Antenna |
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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.
On Sep 2, 2011, at 18:36, "Thomas Barter" <kesleyelectric(at)iowatelecom.net (kesleyelectric(at)iowatelecom.net)> wrote:
[quote]
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.
<image001.jpg>
Tom Barter
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nuckolls.bob(at)aeroelect
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| Posted: Fri Sep 02, 2011 7:51 pm Post subject: Two Radios, One Antenna |
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At 08:20 PM 9/2/2011, you wrote:
| Quote: | 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 . . .
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