Today's Message Index:
----------------------
1. 12:46 AM - Re: Radio reception problems (Geoff Leedham)
2. 01:47 AM - Re: Radio reception problems (R.C.Harrison)
3. 07:05 AM - Re: Radio reception problems (Fred Fillinger)
4. 07:20 AM - Re: Re: labels (Annalights@aol.com)
5. 12:45 PM - Re: Radio reception problems (Bryan Allsop)
6. 03:52 PM - Re: Radio reception problems (Bryan Allsop)
Message 1
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| Subject: | Re: Radio reception problems |
--> Europa-List message posted by: "Geoff Leedham" <sideslip@tiscali.co.uk>
Bryan, I also have the same problem with East Midlands. I have an Icom A200
radio and have noticed that even quite close to EMA that the reception is
poor (lots of static )although Birmingham is loud and clear. I had the
Europa antenna and now have the Bob Archer unit fitted but still the same
poor reception.
One thing I have noticed is that if I switch off the Skymap 11 , the
reception is almost perfect. I have tried using the Skymap on its batteries
to eliminate A/C power but the fault is still there. (have also tried
repositioning the skymap antenna but no improvement.
If you have a Skymap fitted I would try swithing it off to check this out.
If anyone knows how to improve this fault please let me know.
Geoff Leedham G-EOFS
----- Original Message -----
From: "Bryan Allsop" <bryan@blackballclub.com>
Subject: Europa-List: Radio reception problems
> --> Europa-List message posted by: "Bryan Allsop"
> <bryan@blackballclub.com>
>
> I have been interested in the recent correspondence regarding radio
> frequencies, and related performance characteristics. In particular, the
> extreme ranges.
Message 2
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| Subject: | Radio reception problems |
--> Europa-List message posted by: "R.C.Harrison" <ptag.dev@tiscali.co.uk>
Hi! Bryan /all
I have an ICOM A200 having no manual squelch control just an automatic
dump squelch test switch. The auto squelch facility has been works set
and proved to be exactly within their test ranges. It has been a source
of constant grief, although I have been recommended to make an
unauthorised adjustment through the back of it there is no improvement.
I haven't particularly noticed the problem in low or high frequency
contacts but if local Wickenby (122.45) based a/c hear me approaching
requesting join info. they manage to contact me and relay the info.
without the slightest problem. The Wickenby Base hear me "fives" on all
contacts but I don't hear them until almost over the field with the auto
squelch control dumped. The Wickenby base is more often than not a hand
held set probably with a lower wattage output.
I have recently done the revalidation test from 2000ft with Conningsby
on 120.80 at 30 miles over the North Sea without a problem but of course
with the auto squelch dumped! Yet to receive Humberside on 119.125 at 10
miles I must have the auto squelch dumped also.
I had for a long time put this down to the Jabiru alternator/reguator
and/or ignition systems and have tried a multitude of fixes including
grounding of various components such as throttle cables and carb, at
great expense painting out the whole of the engine compartment with
nickel based paint, Magnecore plug leads, resistor type plugs, an auto
type supressor in the radio power line, and my firewall has an aluminium
backing to it between the radio stack and the rest of the electronic
"aggravation"!
I have fitted an Air World belly mount antennae which probably
marginally improved the problems except to get the aircraft in the
trailer it has to be bent aftwards.
All this leads me to suggest, Bryan, that you ask any respondents to
your question that they include particulars of the type of Radio they
have installed?
Regards
Bob H G-PTAG Europa MKI/Jabiru 3300
Robt.C.Harrison
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Bryan
Allsop
Subject: Europa-List: Radio reception problems
--> Europa-List message posted by: "Bryan Allsop"
<bryan@blackballclub.com>
I have been interested in the recent correspondence regarding radio
frequencies, and related performance characteristics. In particular, the
extreme ranges.
East Midlands Airport has a frequency of 134.175. A few weeks ago some
of us flew to an airfield close by which involved us in contacting them.
In subsequent conversation we had all noticed how their transmissions
had been unclear. After making test calls between our aircraft we came
to the conclusion that the East Mids transmitter must be out of sorts.
Last Thursday I went to Le Touquet via the Stanstead low level corridor.
This meant that I had to contact Essex Radar on 120.625. They were
receiving me strength five, but for much of the transit I could not hear
them at all.
Similarly, when I go to France using the Lille Info. frequency (
120.275) to complete the channel crossing, I can never seem to be able
to make contact with them. I have always put it down to my English
accent and their lunch breaks.
In both cases I have been able to hear other aircraft speaking to them
strength five, so my radio was working perfectly.
I can now see that I have a common problem at the lower frequencies,
viz, poor ground station reception. Could it be that other Europas have
a simarly poor reception quality at the higher frequency range. My
aerial was built to the manual, and has always served my well in most
respects.
Are these common experiences? If so, what can, and should we do about
it?
Regards to all.
Bryan Allsop. G BYSA Mono XS
Message 3
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| Subject: | Re: Radio reception problems |
--> Europa-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
> --> Europa-List message posted by: "Bryan Allsop"
<bryan@blackballclub.com>
>
> They were receiving me strength five, but for much
> of the transit I could not hear them at all.
>
Antennas work by the rule of reciprocity, and above indicates antenna
is not the problem, at least in that azimuth of the 360-deg pattern.
> In both cases I have been able to hear other
> aircraft speaking to them strength five,
If you can't hear a ground station, but other A/C yes, and they're not
in the same general azimuth, the radiating pattern of the antenna is
suspect -- an installation location problem. A/C to A/C doesn't have
the line-of-sight problem like A/C to ground over terrain. But the
ground station can achieve a near perfect antenna, canceling out the
line-of-sight issue.
> I can now see that I have a common problem at the lower frequencies,
Receive problems on the extremes of the bands indicate alignment
problems, but radios just don't go out of alignment to any significant
degree, if at all. The degree of problem you report suggests a
component might be way off spec. Low odds, but people hit lotteries.
Also, radiating pattern problems can be frequency dependent to some
degree.
Hope this helps rather than chases wild geese!
BTW, we can't deduce strength five or strength anything from what is
heard, unless rather weak. Leveling circuitry in modern radios +
other factors. Our old control tower was even handing "strength
three" or "four" to people. Must have an S-meter I figure. But first
visit to the tower, I alarmingly saw they used a Genave Alpha 360, a
"doorstop" in alternative use. No S-meter, but that turkey of a radio
could actually hint at strength reasonably well.
Reg,
Fred F.
Message 4
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--> Europa-List message posted by: Annalights@aol.com
If you are looking for laser labels in the UK please contact me off forum at patspost@gmail.com
I have a laser that can do them. If you want a full panel cover
can also do that from almost any graphic file. Can also permanently mark stainless
steel but not cut it!
Patrick
G-PATZ
Message 5
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| Subject: | Re: Radio reception problems |
--> Europa-List message posted by: "Bryan Allsop" <bryan@blackballclub.com>
Hi Bob.
I will ask anyone responding to mention the type of radio they have
installed.
"Will anyone responding please include particulars of the type of radio they
have installed?"
How's that?
Cheers. Bryan
----- Original Message -----
From: "R.C.Harrison" <ptag.dev@tiscali.co.uk>
Subject: RE: Europa-List: Radio reception problems
> --> Europa-List message posted by: "R.C.Harrison" <ptag.dev@tiscali.co.uk>
>
> Hi! Bryan /all
> I have an ICOM A200 having no manual squelch control just an automatic
> dump squelch test switch. The auto squelch facility has been works set
> and proved to be exactly within their test ranges. It has been a source
> of constant grief, although I have been recommended to make an
> unauthorised adjustment through the back of it there is no improvement.
> I haven't particularly noticed the problem in low or high frequency
> contacts but if local Wickenby (122.45) based a/c hear me approaching
> requesting join info. they manage to contact me and relay the info.
> without the slightest problem. The Wickenby Base hear me "fives" on all
> contacts but I don't hear them until almost over the field with the auto
> squelch control dumped. The Wickenby base is more often than not a hand
> held set probably with a lower wattage output.
> I have recently done the revalidation test from 2000ft with Conningsby
> on 120.80 at 30 miles over the North Sea without a problem but of course
> with the auto squelch dumped! Yet to receive Humberside on 119.125 at 10
> miles I must have the auto squelch dumped also.
> I had for a long time put this down to the Jabiru alternator/reguator
> and/or ignition systems and have tried a multitude of fixes including
> grounding of various components such as throttle cables and carb, at
> great expense painting out the whole of the engine compartment with
> nickel based paint, Magnecore plug leads, resistor type plugs, an auto
> type supressor in the radio power line, and my firewall has an aluminium
> backing to it between the radio stack and the rest of the electronic
> "aggravation"!
> I have fitted an Air World belly mount antennae which probably
> marginally improved the problems except to get the aircraft in the
> trailer it has to be bent aftwards.
> All this leads me to suggest, Bryan, that you ask any respondents to
> your question that they include particulars of the type of Radio they
> have installed?
> Regards
> Bob H G-PTAG Europa MKI/Jabiru 3300
>
> Robt.C.Harrison
>
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of Bryan
> Allsop
> To: europa-list@matronics.com
> Subject: Europa-List: Radio reception problems
>
> --> Europa-List message posted by: "Bryan Allsop"
> <bryan@blackballclub.com>
>
> I have been interested in the recent correspondence regarding radio
> frequencies, and related performance characteristics. In particular, the
> extreme ranges.
>
> East Midlands Airport has a frequency of 134.175. A few weeks ago some
> of us flew to an airfield close by which involved us in contacting them.
> In subsequent conversation we had all noticed how their transmissions
> had been unclear. After making test calls between our aircraft we came
> to the conclusion that the East Mids transmitter must be out of sorts.
>
> Last Thursday I went to Le Touquet via the Stanstead low level corridor.
> This meant that I had to contact Essex Radar on 120.625. They were
> receiving me strength five, but for much of the transit I could not hear
> them at all.
>
> Similarly, when I go to France using the Lille Info. frequency (
> 120.275) to complete the channel crossing, I can never seem to be able
> to make contact with them. I have always put it down to my English
> accent and their lunch breaks.
>
> In both cases I have been able to hear other aircraft speaking to them
> strength five, so my radio was working perfectly.
>
> I can now see that I have a common problem at the lower frequencies,
> viz, poor ground station reception. Could it be that other Europas have
> a simarly poor reception quality at the higher frequency range. My
> aerial was built to the manual, and has always served my well in most
> respects.
>
> Are these common experiences? If so, what can, and should we do about
> it?
>
> Regards to all.
>
> Bryan Allsop. G BYSA Mono XS
>
>
>
Message 6
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| Subject: | Re: Radio reception problems |
--> Europa-List message posted by: "Bryan Allsop" <bryan@blackballclub.com>
Thanks for your response Fred.
I confess though that I am not sure that I understand all of it. Age is
beginning to effect the clarity of my thinking processes, perhaps in the
same way that my six year old Icom A 200 is not so clear in extreme
circumstances.
I began to lose the thread with the 'wild geese' and 'turkeys', and
something to do with 'doorstops'. I must also confess that I am not totally
up to speed with 'Genave Alpha 360's either, and I am even a little rusty on
'general azimuth'. Other than that, I think I am almost quite clear about
what you are saying.
So, what can I do Fred? Can I chop a bit off somewhere, or do I need a new
radio?
Incidentally, friends have noticed that the transmit performance drops off
when the European Safety Com frequency 135.475MHz is used.
Regards.. Bryan
----- Original Message -----
From: "Fred Fillinger" <n3eu@comcast.net>
Subject: Re: Europa-List: Radio reception problems
> --> Europa-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
>
>> --> Europa-List message posted by: "Bryan Allsop"
> <bryan@blackballclub.com>
>>
>> They were receiving me strength five, but for much
>> of the transit I could not hear them at all.
>>
> Antennas work by the rule of reciprocity, and above indicates antenna
> is not the problem, at least in that azimuth of the 360-deg pattern.
>
>> In both cases I have been able to hear other
>> aircraft speaking to them strength five,
>
> If you can't hear a ground station, but other A/C yes, and they're not
> in the same general azimuth, the radiating pattern of the antenna is
> suspect -- an installation location problem. A/C to A/C doesn't have
> the line-of-sight problem like A/C to ground over terrain. But the
> ground station can achieve a near perfect antenna, canceling out the
> line-of-sight issue.
>
>> I can now see that I have a common problem at the lower frequencies,
>
> Receive problems on the extremes of the bands indicate alignment
> problems, but radios just don't go out of alignment to any significant
> degree, if at all. The degree of problem you report suggests a
> component might be way off spec. Low odds, but people hit lotteries.
> Also, radiating pattern problems can be frequency dependent to some
> degree.
>
> Hope this helps rather than chases wild geese!
>
> BTW, we can't deduce strength five or strength anything from what is
> heard, unless rather weak. Leveling circuitry in modern radios +
> other factors. Our old control tower was even handing "strength
> three" or "four" to people. Must have an S-meter I figure. But first
> visit to the tower, I alarmingly saw they used a Genave Alpha 360, a
> "doorstop" in alternative use. No S-meter, but that turkey of a radio
> could actually hint at strength reasonably well.
>
> Reg,
> Fred F.
>
>
>
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