Today's Message Index:
----------------------
1. 02:04 AM - Audio & intercom make your own. (Ian Scott)
2. 02:53 AM - VOR aerial (mike toft)
3. 03:48 AM - UK Wire Gauge (Frederic Livesey)
4. 06:31 AM - Re: UK Wire Gauge (Neil Clayton)
5. 07:10 AM - Re: UK Wire Gauge (Rob Housman)
6. 07:17 AM - Re: VOR aerial (Robert L. Nuckolls, III)
7. 07:28 AM - Splitter (Vincent Welch)
8. 08:31 AM - Re: Audio & intercom make your own. (Robert L. Nuckolls, III)
9. 08:51 AM - LVWM (Mark Phillips)
10. 09:48 AM - Re: LVWM (Robert L. Nuckolls, III)
11. 09:54 AM - Re: Splitter (Robert L. Nuckolls, III)
12. 10:06 AM - Re: Splitter (Vincent Welch)
13. 10:10 AM - Re: Splitter (BobsV35B@aol.com)
14. 10:25 AM - Re: Splitter (Robert L. Nuckolls, III)
15. 11:41 AM - RV List 59 msg. digest-5/1 (don522@webtv.net (Don McCallister))
16. 11:43 AM - UK wire guages (John Herminghaus)
17. 01:42 PM - Web Site builder documentation of RV projects - Chris Good's (David Carter)
18. 05:19 PM - Re: UK Wire Gauge (Dave O'Donnell)
19. 06:48 PM - SL30 & GX60 for Sale (Gary Coonan)
20. 07:05 PM - GX60 & SL30 for sale (Gary Coonan)
21. 07:17 PM - Re: UK Wire Gauge (Alex Peterson)
22. 07:46 PM - Re: Audio & intercom make your own. (Ian Scott)
Message 1
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| Subject: | Audio & intercom make your own. |
--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
HI Bob and all,
I saw a diagram somewhere on your site though I cant font it now, for a
roll your own intercom.
I intend to make my own form scratch.
Features are VOX
Music & Sat phone in
Compaq Ipaq sound in,
Transponder Alt alert in
And maybe pilot isolate,
Also what sort of signals (peak to peak) and impedance should I expect
form (and to) the following devices
Personal CD player.
Normal aircraft headsets
Headset micphone.
And what input (and output) voltage and impedance is the Microair 760
expecting, both for mic in and sound out.
Thanks in advance
Ian
Message 2
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--> AeroElectric-List message posted by: "mike toft" <watervet@mweb.co.za>
Bob - I hope this doesn't seem like a dumb question but I am new to the homebuilt
game - but I have received a "Cat's Whisker" VOR aerial with my Garmin GTX320
and as I am building a composite (Europa) want to mount the aerial behind the
rear baggage bulkhead - but 2 problems.
1. Can the aerial face backwards - i.e. the tip of the "V" face tie rudderpost
- the plane of the aerial remains horizontal with the aircraft.?
2. The Whelan power unit for the strobes is below (8-10 ins) the aerial between
the tips of the aerial - is this a problem?
Thanks
Mike Toft
Message 3
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--> AeroElectric-List message posted by: Frederic Livesey <fred.livesey@zetnet.co.uk>
Hi, Here in the UK we use a different method for selecting wire gauge
than the USA, does anyone know where I can get a conversion chart.
Fred
Chester
UK
Message 4
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| Subject: | Re: UK Wire Gauge |
--> AeroElectric-List message posted by: Neil Clayton <harvey4@earthlink.net>
Try Machineries Handbook. I have a copy if you want it looked up. Gimme the
specifics.
Neil
Ex Pat in the USA.
At 06:32 AM 5/1/03, you wrote:
>--> AeroElectric-List message posted by: Frederic Livesey
><fred.livesey@zetnet.co.uk>
>
>Hi, Here in the UK we use a different method for selecting wire gauge
>than the USA, does anyone know where I can get a conversion chart.
>Fred
>Chester
>UK
>
>
Message 5
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--> AeroElectric-List message posted by: "Rob Housman" <RobH@hyperion-ef.com>
Here's an on-line calculator to convert wire gage sizes:
http://www.efunda.com/designstandards/gages/wire_forward.cfm
However, if you prefer a chart of equivalents go to:
http://shopswarf.orcon.net.nz/wiregage.html
Best regards,
Rob Housman
Europa XS Tri-Gear A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Frederic
Livesey
Subject: AeroElectric-List: UK Wire Gauge
--> AeroElectric-List message posted by: Frederic Livesey
<fred.livesey@zetnet.co.uk>
Hi, Here in the UK we use a different method for selecting wire gauge
than the USA, does anyone know where I can get a conversion chart.
Fred
Chester
UK
Message 6
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 11:49 AM 5/2/2003 +0200, you wrote:
>--> AeroElectric-List message posted by: "mike toft" <watervet@mweb.co.za>
>
>Bob - I hope this doesn't seem like a dumb question but I am new to the
>homebuilt game - but I have received a "Cat's Whisker" VOR aerial with my
>Garmin GTX320 and as I am building a composite (Europa) want to mount the
>aerial behind the rear baggage bulkhead - but 2 problems.
>1. Can the aerial face backwards - i.e. the tip of the "V" face tie
>rudderpost - the plane of the aerial remains horizontal with the aircraft.?
Yes, the cat-whisker antennas have been mounted both ways
on many different aircraft.
>2. The Whelan power unit for the strobes is below (8-10 ins) the aerial
>between the tips of the aerial - is this a problem?
Perhaps but only when you are listening to a VOR station
and the only time you'll do this for long periods of time
is when the VOR is being used as a remote transmitter for
some ground based communications facility or the VOR is
a weather broadcast facility . . . pretty rare. I wouldn't
worry about it.
Bob . . .
Message 7
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--> AeroElectric-List message posted by: "Vincent Welch" <welchvincent@hotmail.com>
I read previously that a signal from the NAV antenna can be used for the FM
input to an AM/FM/CD. I am installing a wingtip antenna and would like to
use a splitter to feed the FM radio.
Now for the question. Is there anything special inside of a splitter, by
that I mean are all of the outputs the same? I am asking because I need to
split the signal going into the VAL INS422 also (need GS and NAV inputs).
The splitter that I see in the Spruce catalog is arranged as follows:
NAV NAV
GS ANT
The geometry of my panel indicates that the preferred layout would be:
NAV GS
NAV ANT (this lower NAV would connect to my FM radio)
Can I connect these anyway I like or must the output marked GS go to the GS?
I am trying to avoid sharp bends in the coax.
Does this make any sense to anyone or am I just babbling? :)
Vince Welch
RV-8A
Message 8
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| Subject: | Re: Audio & intercom make your own. |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 07:03 PM 5/2/2003 +1000, you wrote:
>--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
>
>HI Bob and all,
>
>I saw a diagram somewhere on your site though I cant font it now, for a
>roll your own intercom.
>
>I intend to make my own form scratch.
>
>Features are VOX
>Music & Sat phone in
>Compaq Ipaq sound in,
>Transponder Alt alert in
>
>And maybe pilot isolate,
>
>Also what sort of signals (peak to peak) and impedance should I expect
>form (and to) the following devices
>
>Personal CD player.
Contemporary entertainment headsets are lower impedance
than aircraft headsets . . . they can range from 8 to 50
ohms but the voltage to drive them will be in the same
ballpark as aviation headsets . . . I'd figure on 1v pk-pk
to give you a "loud" signal.
>Normal aircraft headsets
150 ohms, 2v pk-pk is pretty loud
>
>Headset micphone.
Bias up the microphone from a well filtered, 6v
source through 470 ohm resistor. Voice signal
levels will be on the order of 1v pk-pk.
Bob . . .
>And what input (and output) voltage and impedance is the Microair 760
>expecting, both for mic in and sound out.
I'd load the headset output with 150 ohms. Dummy load
the mic input to the radio with 1K resistor and impress
levels no more than 1v pk-pk audio level to the transmitter.
Bob . . .
--------------------------------------------
( Knowing about a thing is different than )
( understanding it. One can know a lot )
( and still understand nothing. )
( C.F. Kettering )
--------------------------------------------
Message 9
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--> AeroElectric-List message posted by: Mark Phillips <ripsteel@edge.net>
(re-posted- not sure if this got thru - do not archive )
Bob-
I purchased your LVWM (12 volt) with the incandescent bulb option prior
to converting to all LEDs for my annunciator, and would like to use it
with the following LED bar module from DigiKey:
http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=404&M=MU04-4101
This is an array of 3 superbright LEDs molded into a plastic block.
I've have one of the red arrays powered up and intentionally overdriven
at 50 mA, measured with a Fluke VOM (180 ohm res, LEDs in series) to
determine longevity at an acceptable brightness level.
Can I simply install this arrangement wired to the appropriate LVWM
terminals in place of the incandescent?
Also- sorry to nag ya about this, but curious as to progress on the
Audio Isolation Amplifier........
Thanks!
Mark Phillips - RV-6A
Message 10
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:48 AM 5/2/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: Mark Phillips <ripsteel@edge.net>
>
>(re-posted- not sure if this got thru - do not archive )
>
>Bob-
>
>I purchased your LVWM (12 volt) with the incandescent bulb option prior
>to converting to all LEDs for my annunciator, and would like to use it
>with the following LED bar module from DigiKey:
>
>http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=404&M=MU04-4101
>
>This is an array of 3 superbright LEDs molded into a plastic block.
>I've have one of the red arrays powered up and intentionally overdriven
>at 50 mA, measured with a Fluke VOM (180 ohm res, LEDs in series) to
>determine longevity at an acceptable brightness level.
>
>Can I simply install this arrangement wired to the appropriate LVWM
>terminals in place of the incandescent?
yes
>Also- sorry to nag ya about this, but curious as to progress on the
>Audio Isolation Amplifier........
Got some more work done on it last night. will probably
fire it up this evening.
Bob . . .
Message 11
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:27 AM 5/2/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "Vincent Welch"
><welchvincent@hotmail.com>
>
>
>I read previously that a signal from the NAV antenna can be used for the FM
>input to an AM/FM/CD. I am installing a wingtip antenna and would like to
>use a splitter to feed the FM radio.
>
>Now for the question. Is there anything special inside of a splitter, by
>that I mean are all of the outputs the same? I am asking because I need to
>split the signal going into the VAL INS422 also (need GS and NAV inputs).
>The splitter that I see in the Spruce catalog is arranged as follows:
>
>NAV NAV
>GS ANT
>
>The geometry of my panel indicates that the preferred layout would be:
>
>NAV GS
>NAV ANT (this lower NAV would connect to my FM radio)
>
>Can I connect these anyway I like or must the output marked GS go to the GS?
> I am trying to avoid sharp bends in the coax.
>Does this make any sense to anyone or am I just babbling? :)
Antenna inputs to automotive entertainment receivers are unique
to the application. Their tuners have splitters of a sort
to take AM and FM signals to different circuits and account
for the fact that AM antennas on cars are terrible antennas
and no so bad for FM frequencies. I've heard folks report
"satisfactory" performance from their automotive receiver
when hooked to various and sundry aviation antennas. The
quantified level of performance is problematical but then,
when you are 1 mile in the air, a wet string will have some
degree of performance that you might well find "satisfactory".
Give it a try. It can't do anything worse than be "unsatisfactory"
in which case you'll have to do something else.
Bob . . .
Message 12
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--> AeroElectric-List message posted by: "Vincent Welch" <welchvincent@hotmail.com>
Thanks Bob. In relation to the splitter question; I don't know what is
inside of a splitter, does the GS output have to go to the GS or is that
convient labeling and I can connect the outputs anyway I like?
Vince
>From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
>Reply-To: aeroelectric-list@matronics.com
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List: Splitter
>Date: Fri, 02 May 2003 11:53:18 -0500
>
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
><bob.nuckolls@cox.net>
>
>At 10:27 AM 5/2/2003 -0400, you wrote:
> >--> AeroElectric-List message posted by: "Vincent Welch"
> ><welchvincent@hotmail.com>
> >
> >
> >I read previously that a signal from the NAV antenna can be used for the
>FM
> >input to an AM/FM/CD. I am installing a wingtip antenna and would like
>to
> >use a splitter to feed the FM radio.
> >
> >Now for the question. Is there anything special inside of a splitter, by
> >that I mean are all of the outputs the same? I am asking because I need
>to
> >split the signal going into the VAL INS422 also (need GS and NAV inputs).
> >The splitter that I see in the Spruce catalog is arranged as follows:
> >
> >NAV NAV
> >GS ANT
> >
> >The geometry of my panel indicates that the preferred layout would be:
> >
> >NAV GS
> >NAV ANT (this lower NAV would connect to my FM radio)
> >
> >Can I connect these anyway I like or must the output marked GS go to the
>GS?
> > I am trying to avoid sharp bends in the coax.
>
>
> >Does this make any sense to anyone or am I just babbling? :)
>
> Antenna inputs to automotive entertainment receivers are unique
> to the application. Their tuners have splitters of a sort
> to take AM and FM signals to different circuits and account
> for the fact that AM antennas on cars are terrible antennas
> and no so bad for FM frequencies. I've heard folks report
> "satisfactory" performance from their automotive receiver
> when hooked to various and sundry aviation antennas. The
> quantified level of performance is problematical but then,
> when you are 1 mile in the air, a wet string will have some
> degree of performance that you might well find "satisfactory".
>
> Give it a try. It can't do anything worse than be "unsatisfactory"
> in which case you'll have to do something else.
>
> Bob . . .
>
>
Message 13
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--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 5/2/03 11:54:45 AM Central Daylight Time,
bob.nuckolls@cox.net writes:
> The
> quantified level of performance is problematical but then,
> when you are 1 mile in the air, a wet string will have some
> degree of performance that you might well find "satisfactory".
>
> Give it a try. It can't do anything worse than be "unsatisfactory"
> in which case you'll have to do something else.
Good Afternoon All,
For What It's Worth, the early Narco knob tuned receivers had the capability
of going on down below the 108 frequency range into the top of the FM band.
We often listened to those high end frequency FM stations via the VOR/ILS
receiver.
Happy Skies,
Old Bob
Message 14
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 01:06 PM 5/2/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "Vincent Welch"
><welchvincent@hotmail.com>
>
>Thanks Bob. In relation to the splitter question; I don't know what is
>inside of a splitter, does the GS output have to go to the GS or is that
>convient labeling and I can connect the outputs anyway I like?
yes . . . the various outputs are generally frequency band
specific . . . they need to drive a receiver unique to the
activity of that receiver.
Bob . . .
Message 15
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| Subject: | RV List 59 msg. digest-5/1 |
--> AeroElectric-List message posted by: don522@webtv.net (Don McCallister)
Hi Matt - Is there a problem with getting all 59 msg's - I can 32 and
then it jumps to 96 msg, the day before ---- or is it my problem???
Message 16
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--> AeroElectric-List message posted by: John Herminghaus <catignano@everyday.com>
If you are looking for a conversion of AWG to metric sizes try
http://mdmetric.com/tech/metricwiregage.htm
John Herminghaus
Message 17
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| Subject: | Web Site builder documentation of RV projects - Chris |
Good's
--> AeroElectric-List message posted by: "David Carter" <dcarter@datarecall.net>
Chris Good,
Thanks for calling attention to your excellent website. I've looked at
others (not all, by any means) and have seen others who have posted "some"
info on their RV - but your site is absolutely fabulous! Total
documentation of anything I could think of to look up.
- I highly recommend this web site to anyone building an RV!!
Just yesterday I got my courage up again and did the first update/practice
on my own primitive website since Nov 2000. I've changed computers since
then and had to find and learn how to use a different FTP uploader pgm, and
made a new checklist on how to add "daily" (periodic) update pages to the
site.
Now the wife & I need to learn how to download pictures from our digital
camera we bought last Fall and have never downloaded.
I am at the stage of creating schematics and wiring diagrams for my RV-6
electrical system, and plan to use IntelliCAD (open architecture clone of,
and compatible with, Autocad ), starting off with, and modifying, Bob
Nuckoll's drawings and symbols. I noticed your nice wiring info - color,
etc. What program did you use to create such elegantly simple and clear
graphic info?
About your website, did you copy source code from someone else - like I do -
and modify it? Or, did you have a professional web site person design it
for you? I have the 27 page "NCSA - A Beginner's Guide to HTML" document
that I printed off the internet - I use it for my main reference for HTML
stuff . I create & edit web documents with Notepad, the simplest text
editor. Any tips for us new guys to "web site documentation of our
projects"?
David Carter
http://www.datarecall.net/~dcarter
----- Original Message -----
From: "Chris Good" <chrisjgood@lycos.com>
Subject: Re: RV-List: Skymap IIIC
> --> RV-List message posted by: "Chris Good" <chrisjgood@lycos.com>
>
> Bill,
>
> I have been flying with a Skymap IIIC in my panel for nearly 3 yrs.
<snip>>
<snip>
The "Systems" section on my website includes a wiring drawing for the
Skymap & Navaid, but it's not complicated. Also, there's a photo at the end
of the "photo-log" "panel" page.
>
<snip>
> Regards,
>
> Chris Good,
> West Bend, WI
> RV-6A N86CG 530 hrs flying
> http://rv.supermatrix.com
Message 18
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--> AeroElectric-List message posted by: "Dave O'Donnell" <daveodonnell@direcway.com>
What is the US wire std? In sheet or tubing BWG (Birmingham Wire Gauge)
is the std. So I suspect it is the same in wire. In tubing 16 gauge is
0.065" average wall, normally with a +/- 10% tolerance (ASTM A249 A269,
A1016). This means that if you order 16 gauge (0.065" avg) you get
0.058" min. If you order min wall you get min + 18%. How does it work
in wire?
Regards,
Dave O
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Neil
Clayton
Subject: Re: AeroElectric-List: UK Wire Gauge
--> AeroElectric-List message posted by: Neil Clayton
<harvey4@earthlink.net>
Try Machineries Handbook. I have a copy if you want it looked up. Gimme
the
specifics.
Neil
Ex Pat in the USA.
At 06:32 AM 5/1/03, you wrote:
>--> AeroElectric-List message posted by: Frederic Livesey
><fred.livesey@zetnet.co.uk>
>
>Hi, Here in the UK we use a different method for selecting wire gauge
>than the USA, does anyone know where I can get a conversion chart.
>Fred
>Chester
>UK
>
>
Message 19
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| Subject: | SL30 & GX60 for Sale |
aeroelectric-list@matronics.com, lancair-list@matronics.com,
glasair-list@matronics.com, avionics-list@matronics.com
--> AeroElectric-List message posted by: Gary Coonan <gcoonan@comcast.net>
I had lots of inquires on the UPS SL30 & GX60 I posted for sale, but I
accidentally deleted the responses when I was trying to get rid of all
the nonsense threads of late. So here it is again.
Brand new never mounted or powered. Purchased in Sept 02 and 26 month
warranty is transferable (confirmed by UPS)
Sell
Price
Spruce
List
GPS
GX-60
$ 3,550
$ 3,795
$ 5,195
NAV/COM
SL-30
$ 2,850
$ 3,125
$ 4,155
Annunciator
ACU
$ -
$ 625
$ 695
$ 6,400
$ 7,545
$ 10,045
w/ GPSS - GPS steering for autopilots
I prefer to sell them together, so I will give priority to anyone who
wants both. My primary purpose is to sell the GX60, so I will not sell
the SL30 before the GX60.
Gary M. Coonan .
RV-7 Avionics
<mailto:gcoonan@comcast.net> gcoonan@comcast.net
Do Not Archive
Message 20
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| Subject: | GX60 & SL30 for sale |
--> AeroElectric-List message posted by: Gary Coonan <gcoonan@comcast.net>
I had lots of inquires on the UPS SL30 & GX60 I posted for sale, but I
accidentally deleted the responses when I was trying to get rid of all the
nonsense threads of late. So here it is again.
Brand new never mounted or powered. Purchased in Sept 02 and 26 month
warranty is transferable (confirmed by UPS)
Sell
GPS GX60 w/GPSS $3,550 $3,795
$ 5,195
NAV/COM SL30 $2,850 $3,125
$ 4,155
Annunciator ACU $ 0 $ 625
$ 695
$6,400 $7,545 $10,045
I prefer to sell them together, so I will give priority to anyone who wants
both. My primary purpose is to sell the GX60, so I will not sell the SL30
before the GX60.
Gary M. Coonan .
RV-7 Avionics
gcoonan@comcast.net
Do Not Archive
Message 21
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--> AeroElectric-List message posted by: "Alex Peterson" <alexpeterson@usjet.net>
In the US, anything with "Gauge" as a measurement is hopeless to figure
out. Tubing, wire, sheet metal, etc. There are pages of "standards",
but wire, among other examples, depends on the material. I.e., copper X
gauge is different from steel X gauge. Sheet metal same thing - depends
on the material and which set of "standards". As I said, utterly
hopeless.
Alex Peterson
Maple Grove, MN
RV6-A N66AP 295 hours
www.rvforum.org
www.usfamily.net/web/alexpeterson
> What is the US wire std? In sheet or tubing BWG (Birmingham
> Wire Gauge) is the std. So I suspect it is the same in wire.
> In tubing 16 gauge is 0.065" average wall, normally with a
> +/- 10% tolerance (ASTM A249 A269, A1016). This means that
> if you order 16 gauge (0.065" avg) you get 0.058" min. If
> you order min wall you get min + 18%. How does it work in wire?
>
> Regards,
>
> Dave O
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| Subject: | Audio & intercom make your own. |
--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
Thanks
Ian
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Subject: Re: AeroElectric-List: Audio & intercom make your own.
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
--> <bob.nuckolls@cox.net>
At 07:03 PM 5/2/2003 +1000, you wrote:
>--> AeroElectric-List message posted by: "Ian Scott"
>--> <jabiru22@yahoo.com.au>
>
>HI Bob and all,
>
>I saw a diagram somewhere on your site though I cant font it now, for a
>roll your own intercom.
>
>I intend to make my own form scratch.
>
>Features are VOX
>Music & Sat phone in
>Compaq Ipaq sound in,
>Transponder Alt alert in
>
>And maybe pilot isolate,
>
>Also what sort of signals (peak to peak) and impedance should I expect
>form (and to) the following devices
>
>Personal CD player.
Contemporary entertainment headsets are lower impedance
than aircraft headsets . . . they can range from 8 to 50
ohms but the voltage to drive them will be in the same
ballpark as aviation headsets . . . I'd figure on 1v pk-pk
to give you a "loud" signal.
>Normal aircraft headsets
150 ohms, 2v pk-pk is pretty loud
>
>Headset micphone.
Bias up the microphone from a well filtered, 6v
source through 470 ohm resistor. Voice signal
levels will be on the order of 1v pk-pk.
Bob . . .
>And what input (and output) voltage and impedance is the Microair 760
>expecting, both for mic in and sound out.
I'd load the headset output with 150 ohms. Dummy load
the mic input to the radio with 1K resistor and impress
levels no more than 1v pk-pk audio level to the transmitter.
Bob . . .
--------------------------------------------
( Knowing about a thing is different than )
( understanding it. One can know a lot )
( and still understand nothing. )
( C.F. Kettering )
--------------------------------------------
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