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davidjoyce(at)doctors.org Guest
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Posted: Wed Oct 23, 2013 8:31 am Post subject: Intercom Do you need one |
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I would be grateful for some expert thoughts on the need
for an intercom with a modern radio. I started off 13 yrs
ago with an Icom radio and was persuaded that it was worth
having an additional Flightcom intercom. I subsequently
upgraded to a Garmin SL30 ( which has been fantastic) but
kept the intercom. Now of course we need to be 8.33KHz
compliant so I am planning on getting the Garmin
equivalent of the SL30 which infuriatingly they have made
about a 1/4" fatter vertically. This means I am going to
have to totally redesign that side of my panel, and it
occurs to me that something costing as much as the Garmin
GNC255 should be able to give good quality intercom
without the help of Flightcom and I could ditch the
latter. Any advice gratefully received.
Regards, David Joyce, G-XSDJ
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paul.the.aviator(at)gmail Guest
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Posted: Wed Oct 23, 2013 9:19 am Post subject: Intercom Do you need one |
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Hello David,
I have used the internal intercom on the SL30 for several years and it works quite nicely.
Is there any reason why you would not use the internal intercom in the Garmin GNC255 ?
Paul
[quote][b]
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graeme bird
Joined: 15 Jul 2010 Posts: 434
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Posted: Wed Oct 23, 2013 11:11 am Post subject: Re: Intercom Do you need one |
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I use the atr833 and it has full intercom features selectable with a switch, set the volumes and mic levels etc and feed in external audio, can't see why you would need another box.
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_________________ Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk |
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pjeffers(at)talktalk.net Guest
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Posted: Wed Oct 23, 2013 11:36 am Post subject: Intercom Do you need one |
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One big advantage of using a separate intercom was the VOX arrangement which gives absolute silence in your ears except when transmitting or receiving. Only in my experience have I noted that built in intercoms tend to give a background hiss all the time which I find annoying.
Who knows? the new radios may be better but I would need to be convinced before throwing my old Sigtronics away.
Pete
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davidjoyce(at)doctors.org Guest
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Posted: Thu Oct 24, 2013 7:21 am Post subject: Intercom Do you need one |
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My thanks to Paul, Graeme & Pete. You seem to have
answered my concerns (echoed by Pete) related to a
suspicion that built into the radio intercoms give poor
results. I will go for the GNC 250 and bin my separate
intercom.
Regards, David Joyce, G-XSDJ
On Wed, 23 Oct 2013 12:19:12 -0500
Paul McAllister <paul.the.aviator(at)gmail.com> wrote:
Quote: | Hello David,
I have used the internal intercom on the SL30 for
several years and it
works quite nicely.
Is there any reason why you would not use the internal
intercom in the Garmin
GNC255 ?
Paul
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Remi Guerner
Joined: 14 Dec 2010 Posts: 284
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Posted: Wed Nov 06, 2013 5:24 am Post subject: Re: Intercom Do you need one |
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Hi David,
I am late on that one but I would like to add some comments. I am using a separate intercom (Flightcom 403) as my radio does not have a built in one . Now I am thinking at the possible architecture of my future 8.33 installation. It is very tempting to withdraw the intercom, therefore saving panel space and making the wiring simpler, but I see one big drawback: controlling the intercom function would be a lot more complicated. I have reviewed the Pilot Guide and the Install Manual of the Garmin GTR 225 and GNC 255 radios. There is no dedicated controls for the intercom function on those units.
With a separate intercom, when you need to adjust the volume or the squelch of the intercom, you just rotate a dedicated knob, which is intuitive and very quick. With the GTR225/GNC255 you have to scroll through several pages of menu , using several multifunction buttons and knobs with a risk of making a mistake. In fact this is a configuration task, better not do be done in flight.
BTW switching from the 25 to the 8.33 kHz modes with those new Garmin radios is also a configuration task, so I am afraid it will not be easy to handle the transition period, which may last for several years, where both modes will be used by ATC. May be keeping our old radio for use in the 25kHz mode and use the new one for the 8.33 mode only?
Remi Guerner
F-PGKL
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pete(at)lawless.info Guest
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Posted: Wed Nov 06, 2013 6:01 am Post subject: Intercom Do you need one |
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Hi Remy
Am I missing something here? Why do you need to switch modes to work in the
25 spacing? Does not the 8.33 spacing simply provide 2 extra frequencies in
the gap between the exiting 25 spaced ones?
Regards
Pete
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davidjoyce(at)doctors.org Guest
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Posted: Wed Nov 06, 2013 6:05 am Post subject: Intercom Do you need one |
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Remi, Yes it is a complex issue and a pretty expensive one
too. I have been persuaded though that the intercom
facility on the Garmin GNC 255 or GTR 225 is good and I do
plan to scrap my Flightcom intercom. With a 255 costing
the wrong side of ÂŁ3000 I have on the other hand been
seriously tempted to buy the simplest small 8.33Khz radio
at around ÂŁ1000 and fit that in addition to my SL30. There
is also the question for us oldies of pilot 'Sell by
Dates'. I ask myself whether I shall still be flying in
2017! My heart says Yes, Of course, but the head might
come up with a different answer!
Regards, David Joyce, G-XSDJ (just received my first free
TV licence)
On Wed, 6 Nov 2013 05:24:50 -0800
"Remi Guerner" <air.guerner(at)orange.fr> wrote:
Quote: |
<air.guerner(at)orange.fr>
Hi David,
I am late on that one but I would like to add some
comments. I am using a separate intercom (Flightcom 403)
as my radio does not have a built in one . Now I am
thinking at the possible architecture of my future 8.33
installation. It is very tempting to withdraw the
intercom, therefore saving panel space and making the
wiring simpler, but I see one big drawback: controlling
the intercom function would be a lot more complicated. I
have reviewed the Pilot Guide and the Install Manual of
the Garmin GTR 225 and GNC 255 radios. There is no
dedicated controls for the intercom function on those
units.
With a separate intercom, when you need to adjust the
volume or the squelch of the intercom, you just rotate a
dedicated knob, which is intuitive and very quick. With
the GTR225/GNC255 you have to scroll through several
pages of menu , using several multifunction buttons and
knobs with a risk of making a mistake. In fact this is a
configuration task, better not do be done in flight.
BTW switching from the 25 to the 8.33 kHz modes with
those new Garmin radios is also a configuration task, so
I am afraid it will not be easy to handle the transition
period, which may last for several years, where both
modes will be used by ATC. May be keeping our old radio
for use in the 25kHz mode and use the new one for the
8.33 mode only?
Remi Guerner
F-PGKL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=412252#412252
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rowlandcarson(at)gmail.co Guest
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Posted: Wed Nov 06, 2013 6:20 am Post subject: Intercom Do you need one |
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On 6 Nov 2013, at 13:24, Remi Guerner wrote:
Quote: | Now I am thinking at the possible architecture of my future 8.33 installation. It is very tempting to withdraw the intercom, therefore saving panel space and making the wiring simpler, but I see one big drawback: controlling the intercom function would be a lot more complicated
|
Quote: | BTW switching from the 25 to the 8.33 kHz modes with those new Garmin radios is also a configuration task
|
Remi - my comments, for what they are worth!
I have just decided, based on recent comments in this forum, to delete the intercom from my panel (which is not yet built, but exists as many drawing and wiring diagrams, plus loose parts). I was originally planning to install a 25kHz mode radio as I'd picked up one at a good price. However, the length of time it's taken me to build the aircraft means that I'll probably need a 8.3kHz radio shortly after it's finished, so I decided to get one anyway and sell the other one.
So, I've got a Funkwerk ATR833 now.
I made comparisons of the intercom capabilities between the PS Engineering PM 1000 II (also a second-hand bargain) and the internal one in the ATR833 and found there was little to choose. The radio squelch is not directly accessible but is quite easy - pressing one button changes the volume knob to act as squelch, and it flips back to volume control after 10s inactivity. Intercom VOX setting is reached by pressing the same button 3 times, but my experience with many hired aircraft is that I very seldom need to adjust either the radio squelch or the intercom VOX, once set up. There is a single VOX control for both P1 & P2, but separate mic gain settings are available which could be useful if headsets do not match.
I looked at the ergonomics of several 8.33kHz radios and found that the ATR833 was the only one in my price bracket that automatically chooses between 25kHz & 8.33kHz, depending on the numbers entered. You can also force it to 25kHz only for slightly faster frequency entry (saves 1 digit), but the automatic mode seems most user-friendly and avoids in-flight reconfig.
Of course, I have not yet flown with my proposed setup so its success remains to be seen, but you may be interested in what led to my decisions.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
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| Skype, Twitter: rowland_carson Facebook: Rowland Carson
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danny shepherd
Joined: 27 Jan 2006 Posts: 117 Location: north Wales, United Kingdom
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Posted: Wed Nov 06, 2013 6:46 am Post subject: Intercom Do you need one |
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Hi Roland,
I have been flying now five years with the funkwerk
ATR833, and have no problems what so ever. I find it very easy to use
and very intuative.
When I bought mine it was a "Filser" .
Cheers Danny. G-c.e.r.i
On 06/11/2013 06:19, Rowland Carson wrote:
Quote: |
On 6 Nov 2013, at 13:24, Remi Guerner wrote:
> Now I am thinking at the possible architecture of my future 8.33 installation. It is very tempting to withdraw the intercom, therefore saving panel space and making the wiring simpler, but I see one big drawback: controlling the intercom function would be a lot more complicated
> BTW switching from the 25 to the 8.33 kHz modes with those new Garmin radios is also a configuration task
Remi - my comments, for what they are worth!
I have just decided, based on recent comments in this forum, to delete the intercom from my panel (which is not yet built, but exists as many drawing and wiring diagrams, plus loose parts). I was originally planning to install a 25kHz mode radio as I'd picked up one at a good price. However, the length of time it's taken me to build the aircraft means that I'll probably need a 8.3kHz radio shortly after it's finished, so I decided to get one anyway and sell the other one.
So, I've got a Funkwerk ATR833 now.
I made comparisons of the intercom capabilities between the PS Engineering PM 1000 II (also a second-hand bargain) and the internal one in the ATR833 and found there was little to choose. The radio squelch is not directly accessible but is quite easy - pressing one button changes the volume knob to act as squelch, and it flips back to volume control after 10s inactivity. Intercom VOX setting is reached by pressing the same button 3 times, but my experience with many hired aircraft is that I very seldom need to adjust either the radio squelch or the intercom VOX, once set up. There is a single VOX control for both P1 & P2, but separate mic gain settings are available which could be useful if headsets do not match.
I looked at the ergonomics of several 8.33kHz radios and found that the ATR833 was the only one in my price bracket that automatically chooses between 25kHz & 8.33kHz, depending on the numbers entered. You can also force it to 25kHz only for slightly faster frequency entry (saves 1 digit), but the automatic mode seems most user-friendly and avoids in-flight reconfig.
Of course, I have not yet flown with my proposed setup so its success remains to be seen, but you may be interested in what led to my decisions.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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davidjoyce(at)doctors.org Guest
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Posted: Wed Nov 06, 2013 7:00 am Post subject: Intercom Do you need one |
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Roland, I have no doubt you are aware of it, but for the
sake of others still doing their thinking it will not be
possible in the EU from 17/11/13 to get a new plane
accepted without an 8.33 radio. Regards, David Joyce,
G-XSDJ
On Wed, 6 Nov 2013 14:19:39 +0000
Rowland Carson <rowlandcarson(at)gmail.com> wrote:
Quote: |
<rowlandcarson(at)gmail.com>
On 6 Nov 2013, at 13:24, Remi Guerner wrote:
> Now I am thinking at the possible architecture of my
>future 8.33 installation. It is very tempting to withdraw
>the intercom, therefore saving panel space and making the
>wiring simpler, but I see one big drawback: controlling
>the intercom function would be a lot more complicated
> BTW switching from the 25 to the 8.33 kHz modes with
>those new Garmin radios is also a configuration task
Remi - my comments, for what they are worth!
I have just decided, based on recent comments in this
forum, to delete the intercom from my panel (which is not
yet built, but exists as many drawing and wiring
diagrams, plus loose parts). I was originally planning to
install a 25kHz mode radio as I'd picked up one at a good
price. However, the length of time it's taken me to build
the aircraft means that I'll probably need a 8.3kHz radio
shortly after it's finished, so I decided to get one
anyway and sell the other one.
So, I've got a Funkwerk ATR833 now.
I made comparisons of the intercom capabilities between
the PS Engineering PM 1000 II (also a second-hand
bargain) and the internal one in the ATR833 and found
there was little to choose. The radio squelch is not
directly accessible but is quite easy - pressing one
button changes the volume knob to act as squelch, and it
flips back to volume control after 10s inactivity.
Intercom VOX setting is reached by pressing the same
button 3 times, but my experience with many hired
aircraft is that I very seldom need to adjust either the
radio squelch or the intercom VOX, once set up. There is
a single VOX control for both P1 & P2, but separate mic
gain settings are available which could be useful if
headsets do not match.
I looked at the ergonomics of several 8.33kHz radios and
found that the ATR833 was the only one in my price
bracket that automatically chooses between 25kHz &
8.33kHz, depending on the numbers entered. You can also
force it to 25kHz only for slightly faster frequency
entry (saves 1 digit), but the automatic mode seems most
user-friendly and avoids in-flight reconfig.
Of course, I have not yet flown with my proposed setup
so its success remains to be seen, but you may be
interested in what led to my decisions.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w'
...
| <rowlandcarson(at)gmail.com>
http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland
Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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pete(at)lawless.info Guest
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Posted: Wed Nov 06, 2013 7:11 am Post subject: Intercom Do you need one |
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Hi All
For the LAA it's only the radio that needs to be accepted prior to the 17
November.
So if you are flight testing a new build in the UK get the radio test done
and submit the paperwork for the radio to the LAA prior to the 17th.
Regards
Pete
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john.heykoop(at)gmail.com Guest
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Posted: Wed Nov 06, 2013 8:56 am Post subject: Intercom Do you need one |
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David
I do envy you youngsters. I did not finish building my plane until I was 79 and have now had three great years flying it. The odds of passing my class 2 medical must be worsening all the time, but on the other hand I don't feel any different and might stay fit and well until my nineties. So to hell with the expense, next year I will definitely invest in a 8.25Khz radio.
There are quite a number of Europa pilots who are getting on a bit, and my advice to them would be not to give up prematurely. I reckon the physical and mental effort of flying and maintaining a Europa and the sheer enjoyment it provides are things that help to keep one young. Of course, if you start to develop a medical problem, or if you notice your flying starts to deteriorate, then it would be foolish to continue. But until then, enjoy!
Regards
John
XS Mono G-JHKP
On 6 Nov 2013, at 14:03, "David Joyce" <davidjoyce(at)doctors.org.uk> wrote:
Quote: | There is also the question for us oldies of pilot 'Sell by Dates'. I ask myself whether I shall still be flying in 2017! My heart says Yes, Of course, but the head might come up with a different answer!
Regards, David Joyce, G-XSDJ (just received my first free TV licence)
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alanb(at)dpy01.co.uk Guest
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Posted: Wed Nov 06, 2013 9:55 am Post subject: Intercom Do you need one |
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For those in the UK beware. Icom currently have this statement on their specification for the IC-A6
NOTICE FOR USE for IC-A6E and IC-A24E VHF
AIRBAND TRANSCEIVERS
These versions of the IC-A6E and IC-A24E comply with
requirements of the European Radio and Telecommunication
Terminal Directive 1999/5/EC and are RTTE and CE approved.
At present, full approval for air use is not attainable for these
products or any other product at this level in the market place.
Therefore, the IC-A6E and IC-A24E are both intended for use in
Europe for ground use only*. Under the Wireless and Telegraphy
Act of 2006 these radios can be used for emergency
communication and navigation (VOR) should your life be at risk.
*Unless an aviation body in an EU member state gives
dispensation for it to be used in the air.
My understanding from sources is there is currently no handheld 8.33kHz capable radio in the UK with an approval for use in an aircraft and boo dispensation has been given.
Sad state of affair but there we have it if some one can prove it wrong then please do!
I have the ATR833 in use and can confirm it is a nice radio and the controls for the Intercom easy to get at with simple three pushes of the select button and then twiddle the knob to change the i/c volume. I find once set on the ground it does not need changing in the air but have found it easy to do anyway.
Alan
#0303
On 6 Nov 2013, at 16:54, John Heykoop <john.heykoop(at)gmail.com (john.heykoop(at)gmail.com)> wrote:
[quote]--> Europa-List message posted by: John Heykoop <john.heykoop(at)gmail.com (john.heykoop(at)gmail.com)>
David
I do envy you youngsters. I did not finish building my plane until I was 79 and have now had three great years flying it. The odds of passing my class 2 medical must be worsening all the time, but on the other hand I don't feel any different and might stay fit and well until my nineties. So to hell with the expense, next year I will definitely invest in a 8.25Khz radio.
There are quite a number of Europa pilots who are getting on a bit, and my advice to them would be not to give up prematurely. I reckon the physical and mental effort of flying and maintaining a Europa and the sheer enjoyment it provides are things that help to keep one young. Of course, if you start to develop a medical problem, or if you notice your flying starts to deteriorate, then it would be foolish to continue. But until then, enjoy!
Regards
John
XS Mono G-JHKP
On 6 Nov 2013, at 14:03, "David Joyce" <davidjoyce(at)doctors.org.uk (davidjoyce(at)doctors.org.uk)> wrote:
[quote]There is also the question for us oldies of pilot 'Sell by Dates'. I ask myself whether I shall still be flying in 2017! My heart says Yes, Of course, but the head might come up with a different answer!
Regards, David Joyce, G-XSDJ (just received my first free TV (And Get AeroElectric http://www.matronics.com/co -Matt Dralle, List - The Europa-List --> http://www.matroni &n=============
[b]
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Remi Guerner
Joined: 14 Dec 2010 Posts: 284
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Posted: Wed Nov 06, 2013 12:48 pm Post subject: Re: Intercom Do you need one |
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Pete,
I thought it was as simple as that before I read an article in the May 2013 issue of the Light Aviation magazine. You must transmit/receive on a given frequency in 25kHz mode or in 8.33 mode depending on the mode used by the ATC unit for that frequency. Let's say the required frequency is 130.025, the radio will transmit/receive on 130.025 on 25kHz mode. Now dial 130.030, the radio will transmit/receive on the same 130.025 but on 8.33kHz mode. Crazy, isn’it ? Now dial 130.035 and you will transmit/receive on 130.0333 (130.025+8.33) on 8.33 mode. Dial 130.040 and you will get 130.0416 (130.0333+8.33). Next frequency will be 130.050, and so on....
Remi
[quote] Am I missing something here? Why do you need to switch modes to work in the 25 spacing? Does not the 8.33 spacing simply provide 2 extra frequencies in
the gap between the exiting 25 spaced ones?
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richard.holder(at)outlook Guest
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Posted: Wed Nov 06, 2013 1:28 pm Post subject: Intercom Do you need one |
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On 06/11/2013 20:48, Remi Guerner wrote:
Quote: |
<air.guerner(at)orange.fr>
|
Quote: | I thought it was as simple as that before I read an
article in the May 2013 issue of the Light Aviation
magazine. You must transmit/receive on a given
frequency in 25kHz mode or in 8.33 mode depending on
the mode used by the ATC unit for that frequency. Let's
say the required frequency is 130.025, the radio will
transmit/receive on 130.025 on 25kHz mode. Now dial
130.030, the radio will transmit/receive on the same
130.025 but on 8.33kHz mode. Crazy, isn’it ? Now
dial 130.035 and you will transmit/receive on 130.0333
(130.025+8.33) on 8.33 mode. Dial 130.040 and you will
get 130.0416 (130.0333+8.33). Next frequency will be
130.050, and so on.... Remi
|
Exactly right.
[quote] Quote: | Am I missing something here? Why do you need
to switch modes to work in the 25 spacing? Does not the
8.33 spacing simply provide 2 extra frequencies in the
gap between the exiting 25 spaced ones?
|
It is to do with the accuracy of the transmissions. a
25kHz transmitter will span more of the spectrum than a
8.33kkHz transmitter. Thus all the 833 frequencies are
distinct and don't step on and over each other.
If a base station retains the (using the above example)
130.025 frequency, staying in 25kHz mode, then the two
(833) frequencies either side will not be usable within
transmission distance.
Now that I am on, I will give you my take on intercoms.
A proper stand alone intercom will have two microphone
circuits (sometimes four or six) - each independent. Thus
each microphone will have its own circuit.
The problem with using the intercom provided in a radio is
that they usually only have one microphone circuit and
therefore microphones have to be connected in parallel.
This leads to the oft quoted problem that David Clark
headsets are incompatible with other makes.
David Clark have low impedance microphones which if a DC
and a non-DC are connected in parallel, will swamp the
non-DC microphone. Thus leading to the "incompatibility" tag.
In an aircraft with a "proper" (separate) intercom, there
will be no incompatibility issues with DC headsets as each
microphone has a separate circuit.
I know the KX125 I have has only one microphone circuit
available so I have a separate intercom. Other radios may
have more than one mike circuit (and therefore probably
more than one PTT circuit) but I am not aware of them.
I suggest therefore that throwing away your intercom may
not be a good idea with certain radios. Obviously if you
only connect one headset up then the radio intercom is
fine, but with one one headset you don't have anyone to
communicate with through the intercom !!!!!!!
Richard Holder
G-OWWW
aka ANRMAN
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pete(at)lawless.info Guest
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Posted: Wed Nov 06, 2013 2:17 pm Post subject: Intercom Do you need one |
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Hi Remi
I was indeed missing something! And missed that article thanks for the
pointer. What a crazy set up only the EU bureaucrats could dream that one
up. Still I have no plans to change till I have to in 4 years time and by
then it may be sorted out.
Regards
Pete
--
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rowlandcarson(at)gmail.co Guest
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Posted: Thu Nov 07, 2013 9:37 am Post subject: Intercom Do you need one |
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On 6 Nov 2013, at 22:46, danny shepherd wrote:
Quote: | I have been flying now five years with the funkwerk ATR833, and have no problems what so ever. I find it very easy to use and very intuative.
When I bought mine it was a "Filser" .
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Danny - thanks for your encouraging message.
By the way, as perhaps a final postscript to this thread, my intercom (PS Engineering PM 1000 II model 11902 serial VJ-09895) is now forsale on the Sales section of the LAA bulletin board.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
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