Today's Message Index:
----------------------
1. 04:43 AM - Re: Re: OV protection circuit design (Robert L. Nuckolls, III)
2. 10:42 AM - Two Radios to One Intercom (Sebastien)
3. 11:48 AM - Re: Two Radios to One Intercom (Charlie England)
4. 12:22 PM - Re: Two Radios to One Intercom (user9253)
Message 1
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| Subject: | Re: OV protection circuit design |
At 11:10 AM 3/9/2020, you wrote:
>Bob,
>
>At what fuse rating does the breaker pop before the fuse? 30A, 40A,
>50A... ???
>
>Just curious...
No hard and fast rule . . . both breakers and
fuses can be had in a range of trip profiles.
I've tested the ATO/ATC30 plastic fuses
against the miniature breakers popular in
aircraft with a goal of at least 3x head-room
with a 100A crowbar event.
I couldn't find my favorite 300A HE sensor
but did find a 400A that will let me repeat
the bench tests but I'll take a look at the
ATO40 fuse also.
Bob . . .
Message 2
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| Subject: | Two Radios to One Intercom |
Hello All,
I have been searching through the list archives as I'm sure we
have discussed this before but cannot find the exact answer. We currently
have a single VHF radio going to an intercom and would like to add a second
radio. Input to the intercom would be controlled by the volume knobs on the
radios and output will be controlled by a transmit select switch which will
only allow the ptt line to be triggered on one radio at a time.
What is required to combine the audio output of the two radios to a single
audio input on the intercom?
Thank you,
Sebastien
Message 3
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| Subject: | Re: Two Radios to One Intercom |
Simplest way is a ~500 ohm resister in series with each radio's output, and
tying the downstream ends together to feed the intercom radio input=2E
Ch
arlie
=81=A3Sent from BlueMail =8B
On Mar 10, 2020, 12:48 PM, at
12:48 PM, Sebastien <cluros@gmail=2Ecom> wrote:
>Hello All,
>
>I have been
searching through the list archives as I'm sure we
>have discussed this be
fore but cannot find the exact answer=2E We
>currently
>have a single VHF r
adio going to an intercom and would like to add a
>second
>radio=2E Input t
o the intercom would be controlled by the volume knobs on
>the
>radios and
output will be controlled by a transmit select switch which
>will
>only all
ow the ptt line to be triggered on one radio at a time=2E
>
>What is requir
ed to combine the audio output of the two radios to a
>single
>audio input
on the intercom?
>
>Thank you,
>
>Sebastien
Message 4
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| Subject: | Re: Two Radios to One Intercom |
Found this drawing someplace.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=495222#495222
Attachments:
http://forums.matronics.com//files/audio_combine_160.jpg
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