Today's Message Index:
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0. 09:26 AM - Make Sure You're Listed -- List of Contributors Published Dec 1! (Matt Dralle)
1. 07:00 AM - Re: Re: PTT Y adapter for RST intercom (Robert L. Nuckolls, III)
2. 07:48 AM - Re: PTT Y adapter for RST intercom (messydeer)
3. 08:35 AM - Re: Re: PTT Y adapter for RST intercom (Robert L. Nuckolls, III)
4. 04:35 PM - brand cialis (RailsMAN)
5. 09:32 PM - Re: PTT Y adapter for RST intercom (messydeer)
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| Subject: | Make Sure You're Listed -- List of Contributors Published |
Dec 1!
Dear Listers,
The List of Contributors (LOC) is just around the corner! On December 1st I post
a list of everyone that so generously made a Contribution to support the Lists.
Its my way of publicly thanking everyone that took a minute to show their
appreciation for the Lists.
As a number of people have pointed out in their Contribution comments, the Lists
are a whole lot more valuable than your typical magazine subscription!
Won't you take minute and assure that your name is on the upcoming LOC? Tell others
that you appreciate the Lists. Making a Contribution to support the Lists
is fast and easy using your Visa, MasterCard, or Paypal account:
http://www.matronics.com/contribution
Or, by dropping a personal check in the mail to:
Matronics / Matt Dralle
581 Jeannie Way
Livermore CA 94550
I would like to thank everyone that has so generously made a Contribution thus
far during this year's List Fund Raiser! Remember that its YOUR support that
keeps these Lists running and improving! Don't forget to include a little comment
about how the Lists have helped you!
Thank you!
Matt Dralle
Matronics Email List Administrator
Message 1
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| Subject: | Re: PTT Y adapter for RST intercom |
I erased the ring connections in my drawing, leaving just the shell
and tip connects for the plugs.
Understand. My comment was based on the fact that microphone
jacks were depicted with only two connections.
In the drawings I publish . . .
Emacs!
A microphone jack is drawn with all available connections
so that it is clear which connections are or are not
used. Note that the schematic emulates the position of
the connection along the barrel axis of the plug. The connection
closest to the jack's mounting is the sleeve (mic) and
furthest away is the tip (ptt). In the drawings where
PTT is not connected, PTT functions are addressed
elsewhere as in the snapshot above. If only PTT connections
are used, then mic audio functions have to be addressed
elsewhere.
My comment was only a reaction to seeing a "mic jack"
with two available connections. If you hand this
to a technician along with the mic jack and say, "Here,
wire this up," then there is a possibility of
error or further questions to address.
Schematics are a bit of a hot-button with me. I
think they should be jump-off-the-page self
explanatory. I was editing a service manual on
the Cessna Nav-O-Matic 400 Autopilot as a tech
writer about 1967. It was the first time I encountered
a progressive transfer switch in a product.
It took me some time to figure out how the thing
worked because the symbology did not describe the
function. I crafted this symbol and put it into
the autopilot control head schematic . . .
Emacs!
My supervisor jumped all over me for departing
from the ". . . accepted way of depicting the
switch. After all the guys who designed the autopilot
certainly had a lot more mo-jo than a 24 year
old tech writer . . ."
I had to take the argument up to the chief
electrical engineer to get it blessed. To my
knowledge, that is the first time a progressive
transfer function was accurately depicted
schematically in a publication.
I also noticed in the micjack.html article the mic jacks have ring
terminals that are connected to the pilot and copilot mic hi leads of
the 760 radio, while in another drawing of yours,
http://www.aeroelectric.com/PPS/Audio/hv1_760vhf.pdf you show these
mic jacks with nothing connected to them.
In the excerpt above, look at the position of the
connections along the axis of plug. Those mic jacks
are for audio only. I.e. no hand-held microphones
with PTT switches. PTT functions are managed elsewhere
and only the ring terminal is utilized in the jack.
When you 'erased the ring connections' your schematic
lost clarity.
Bob . . .
Message 2
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| Subject: | Re: PTT Y adapter for RST intercom |
Understand the importance of making drawings clear, thanks. I added the missing
ring terminal, which is left unconnected. In published drawings, the mic jacks
leave the tip unconnected, but I went according to your PTT adapter hand drawing.
I couldn't find it on your site so posted a renamed copy of it here.
Is my wiring drawing now correct, so that it'll work how I intend it?
I've also seen some diagrams labeled 'HI' and 'LO'. What's this all about?
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=358628#358628
Attachments:
http://forums.matronics.com//files/push_to_talk_adapter_ptt_467.pdf
http://forums.matronics.com//files/rst_intercom_ptt_y_adapter_rework2_146.jpg
Message 3
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| Subject: | Re: PTT Y adapter for RST intercom |
At 09:45 AM 11/21/2011, you wrote:
>
>Understand the importance of making drawings clear, thanks. I added
>the missing ring terminal, which is left unconnected. In published
>drawings, the mic jacks leave the tip unconnected, but I went
>according to your PTT adapter hand drawing. I couldn't find it on
>your site so posted a renamed copy of it here.
>
>Is my wiring drawing now correct, so that it'll work how I intend it?
That will work . . .
>I've also seen some diagrams labeled 'HI' and 'LO'. What's this all about?
That's an artifact from the world of balanced audio
signals where there was value in denoting polarity
or phase where neither signal lead was a ground.
+ and - seemed good for DC signals but didn't make
sense for AC . . . so HI and LO were adopted. This
carried over into some unbalanced signal circuits
where "LO" is really signal ground and "HI" is the
information path.
Bob . . .
Message 4
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any else info about that ?
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Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=358770#358770
Message 5
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| Subject: | Re: PTT Y adapter for RST intercom |
> "LO" is really signal ground
Wish I woulda asked earlier. Makes the diagrams less confusing.
I need to make sure I understand how a PTT circuit works. Lemme start with a panel
mount radio. The two I've seen have dedicated terminals labeled 'PTT'. This
circuit is normally open, but when the PTT button on the stick is pushed, a
ground path is completed. This causes the radio to transmit. In the Microair 760,
it looks like pushing either one of the parallel connected PTT buttons would
transmit both mics, since they're both connected to the same PTT terminal on
the radio. If this is correct, then I've understood it well enough to wire a
panel mounted radio.
But I am getting a Dynon DX15 handheld radio and already have an RST 442 intercom to install. I just noticed earlier today you have wiring diagrams for this, http://www.aeroelectric.com/Installation_Data/RST/RST-442.pdf I've disassembled the RST intercom chasis and plan to mount just the squelch and volume controls and the all/pilot toggle switch on the panel and run the mic and phone leads to the permanently mounted mic and phone jacks in the panel.
I plan to connect the mic out wires from the RST chassis behind my panel to the
handheld radio, with PTT switches in between them. So I tweaked the design a
little to allow for direct wiring instead of using the clunky plugs and jacks
supplied with the RST unit. With the system I have drawn, pushing either PTT button
would make both mics transmit, right?
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=358785#358785
Attachments:
http://forums.matronics.com//files/rst_intercom_mic_out_ptt_wiring_313.jpg
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