RE: Real product interference source at 121 MHz
Gary,
I don't remember, but the other post stating that the band is only a few KHz
sounds about right.
Josh
From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com]
Sent: Wednesday, February 12, 2003 1:56 PM
To: Joshua Wiseman; drcuthbert; Kurt Fischer;
emc-p...@majordomo.ieee.org
Subject: RE: Real product interference source at 121 MHz
What are the 3 and 6 db points of the 121.5 Mhz skirts? The original
note was 121 Mhz. How wide is the satellite link? Shouldn't the be exclusive?
Gary
N,j^ AȞ#ۜ&zܓygƥ
^y霦\v+ "ybb+h nȭya 0{by種ޙ?\: jw *.˛بǧvf&j:+v瞢0m"
^){.n+lhǧvf-b֝)ڶFωצr-r z(&
u֯z֭ah%̪-ݙbrtۭzxy+!zi^'z! p{{^+bwWr-r,)౪j!jwly܅z ma 0rx(ޙl
RE: Real product interference source at 121 MHz
Kurt:
I am a pilot and fly in the SF Bay often. In fact, I fly out of Palo Alto.
I finally got a chance to pull out my charts. Although you are located a
couple of miles
>from the west end of the Livermore (LVK) airport runway 25 L / R, there does
>not
appear to be any close tower or CTAF frequency in the area.
However, BAY Approach does use 120.9 MHz for aircraft approaching from the NW
(over Marin). The modulation would be AM with plenty of power. That is the
closest
frequency in use in the area. It would appear to be intermittant since the
communication
is not continious, but on an as needed basis.
I suggest that you get a scanner or (good) spectrum analyzer and see if you
can determine
the "exact" frequency and modulation, if any.
John Shinn, P.E.
Manager, Lab Operations
Sanmina-SCI
john.sh...@sanmina-sci.com
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Kurt Fischer
Sent: Tuesday, February 11, 2003 7:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz that
is intermittent in nature and physically located in Northern USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps some
after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was not
present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
?+&z?~?&A0$r' v -I?$r qBi?zg \v+ "?yb ? y" m { l
??qr ? *m ?j:+v?'{ +^?) b ? ms lhn [hZvh?kj +h -sr ??o?`? jWu w rh'2 *'
[h 6^ y `Zr ?i ^y
Re: Real product interference source at 121 MHz
Seems if the interference really is 121.0 MHz, I doubt that one would see
the narrow band signals from 121.5. Aircraft comms are AM and on the order
of 5 or 6kHz wide, so it's much more likely the interference is from a Tower
or Approach frequency used somewhere in the northeast. (As I said earlier,
Austin TX uses 121.0 as a tower frequency and it's likely there are other
towers on the same frequency somewhere in the country or in Canada.)
Mike Hopkins
michael.hopk...@thermo.com
From: "Gary McInturff"
To: "Joshua Wiseman" ; "drcuthbert"
; "Kurt Fischer" ;
Sent: Wednesday, February 12, 2003 4:55 PM
Subject: RE: Real product interference source at 121 MHz
> What are the 3 and 6 db points of the 121.5 Mhz skirts? The original note
was 121 Mhz. How wide is the satellite link? Shouldn't the be exclusive?
> Gary
>
> -Original Message-
> From: Joshua Wiseman [mailto:jwise...@printronix.com]
> Sent: Tuesday, February 11, 2003 10:22 AM
> To: drcuthbert; Kurt Fischer; emc-p...@majordomo.ieee.org
> Subject: RE: Real product interference source at 121 MHz
>
>
> Kurt,
>
> In my Air Traffic radio repair days I became intimately familiar with
121.5 and 243 MHz. These are the emergency frequencies used N. America.
They are used for locating both the plane and pilot in the event of an
emergency. They are also used by pilots when they have lost their bearings
and need help getting to their destination among other things.
>
> This frequency has added power when transmitter from the ground so that it
can be heard at a greater distance.
>
> Good Luck,
> Josh
>
> -Original Message-
> From: drcuthbert [mailto:drcuthb...@micron.com]
> Sent: Tuesday, February 11, 2003 8:32 AM
> To: 'Kurt Fischer'; emc-p...@majordomo.ieee.org
> Subject: RE: Real product interference source at 121 MHz
>
>
>
> Kurt,
> this could be aviation communications. AM voice is centered at about 121
> MHz.
>
>Dave
>
> -Original Message-
> From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
> Sent: Tuesday, February 11, 2003 8:03 AM
> To: emc-p...@majordomo.ieee.org
> Subject: Real product interference source at 121 MHz
>
>
> Hello all,
>
> A strange request but this has become an interference issue with a
sattelite
> communications link There seems to be a very strong interferer at 121 MHz
> that is intermittent in nature and physically located in Northern
> USA/Canada.
>
> It could be the marketing of a non-compliant consumer products or perhaps
> some after market sattelite rec. retro-fit kit??
>
> Has anyone else had this experience in the last year --- (the problem was
> not present 2 years ago)?
> It does appear to getting worse and is spreading geographically as well.
>
> Regards,
> Kurt Fischer
> Hyper Corp
> N,jࢱ^ AȞ#ˡ&zܓyg ƥ
> ^y\v+ :""ybb2+h nȭya 0{by種̡ޙ?&\: jw *.˛
> بǧvf&j:+v 瞢0m" ^){.n+ l5h.ǧvf-b2)²ڶF -צr-r z(&
> + u֯z֭ah%̪-ʉ̱ݙbrtۭzxy+!zi^'z!
> ⱷ p{ॕǢ{^ +bwWr-r,)౪j7!jwly*z ma6 0r x(l
>
> ---
> This message is from the IEEE EMC Society Product Safety
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> Nj zy
> yvny{yᙦjvjvnvFω᭭צr-r z(&
> ૫ 猀u֯z֭ah%̪-銉̱ݙbrtۭzxy+耘!zi退^'z!ʊ��
p{奕Ǣ{^ޞ+bwWr-r,)౪j!jwlyzɉ maබ䵌 0rɉx(Øl
> N,jࢱ^ AȞ#ˡ&zܓyg ƥ
> ^y\v+ :""ybb2+h nȭya 0{by種̡ޙ?&\: jw *.˛
> بǧvf&j:+v 瞢0m" ^){.n+ l5h.ǧvf-b2)²ڶF -צr-r z(&
> + u֯z֭ah%̪-ʉ̱ݙbrtۭzxy+!zi^'z!
> ⱷ p{ॕǢ{^ +bwWr-r,)౪j7!jwly*z ma6 0r x(l
>
This message is from the IEEE EMC Society Product Safety
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RE: Real product interference source at 121 MHz
What are the 3 and 6 db points of the 121.5 Mhz skirts? The original
note was 121 Mhz. How wide is the satellite link? Shouldn't the be exclusive?
Gary
From: Joshua Wiseman [mailto:jwise...@printronix.com]
Sent: Tuesday, February 11, 2003 10:22 AM
To: drcuthbert; Kurt Fischer; emc-p...@majordomo.ieee.org
Subject: RE: Real product interference source at 121 MHz
Kurt,
In my Air Traffic radio repair days I became intimately familiar with 121.5 and
243 MHz. These are the emergency frequencies used N. America. They are used
for locating both the plane and pilot in the event of an emergency. They are
also used by pilots when they have lost their bearings and need help getting to
their destination among other things.
This frequency has added power when transmitter from the ground so that it can
be heard at a greater distance.
Good Luck,
Josh
From: drcuthbert [mailto:drcuthb...@micron.com]
Sent: Tuesday, February 11, 2003 8:32 AM
To: 'Kurt Fischer'; emc-p...@majordomo.ieee.org
Subject: RE: Real product interference source at 121 MHz
Kurt,
this could be aviation communications. AM voice is centered at about 121
MHz.
Dave
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 8:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,jࢱ^ AȞ#ˡ&zܓygƥ
^y\v+ :""ybb2+h nȭya 0{by種̡ޙ?&\: jw *.˛
بǧvf&j:+v 瞢0m" ^){.n+l5h.ǧvf-b2)²ڶF-צr-r z(&
+ u֯z֭ah%̪-ʉ̱ݙbrtۭzxy+!zi^'z!
ⱷ p{ॕǢ{^ +bwWr-r,)౪j7!jwly*z ma6 0rx(l
This message is from the IEEE EMC Society Product Safety
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Nj zy
yvny{yᙦjvjvnvFω᭭צr-r z(&
૫ 猀u֯z֭ah%̪-銉̱ݙbrtۭzxy+耘!zi退^'z!ʊ�� p{奕Ǣ{^ޞ+bwWr-r,)౪j!jwlyzɉ maබ䵌
0rɉx(Øl
N,j^ AȞ#ۜ&zܓygƥ
^y霦\v+ "ybb+h nȭya 0{by種ޙ?\: jw *.˛بǧvf&j:+v瞢0m"
^){.n+lhǧvf-b֝)ڶFωצr-r z(&
u֯z֭ah%̪-ݙbrtۭzxy+!zi^'z! p{{^+bwWr-r,)౪j!jwly܅z ma 0rx(ޙl
RE: Real product interference source at 121 MHz
Kurt,
In my Air Traffic radio repair days I became intimately familiar with 121.5 and
243 MHz. These are the emergency frequencies used N. America. They are used
for locating both the plane and pilot in the event of an emergency. They are
also used by pilots when they have lost their bearings and need help getting to
their destination among other things.
This frequency has added power when transmitter from the ground so that it can
be heard at a greater distance.
Good Luck,
Josh
From: drcuthbert [mailto:drcuthb...@micron.com]
Sent: Tuesday, February 11, 2003 8:32 AM
To: 'Kurt Fischer'; emc-p...@majordomo.ieee.org
Subject: RE: Real product interference source at 121 MHz
Kurt,
this could be aviation communications. AM voice is centered at about 121
MHz.
Dave
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 8:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,jࢱ^ AȞ#ˡ&zܓygƥ
^y\v+ :""ybb2+h nȭya 0{by種̡ޙ?&\: jw *.˛
بǧvf&j:+v 瞢0m" ^){.n+l5h.ǧvf-b2)²ڶF-צr-r z(&
+ u֯z֭ah%̪-ʉ̱ݙbrtۭzxy+!zi^'z!
ⱷ p{ॕǢ{^ +bwWr-r,)౪j7!jwly*z ma6 0rx(l
This message is from the IEEE EMC Society Product Safety
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Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
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N,j^ AȞ#ۜ&zܓygƥ
^y霦\v+ "ybb+h nȭya 0{by種ޙ?\: jw *.˛بǧvf&j:+v瞢0m"
^){.n+lhǧvf-b֝)ڶFωצr-r z(&
u֯z֭ah%̪-ݙbrtۭzxy+!zi^'z! p{{^+bwWr-r,)౪j!jwly܅z ma 0rx(ޙl
RE: Real product interference source at 121 MHz
I saw a tv clip on "grey-market" modifications to satellite receivers in southern Ontario and Quebec allegedly causing interference, they used a 4.5MHz clock. Best regards, David. David Gelfand Approvals/Design Engineer Memotec Inc. Tel: 514 738 4781 x4151 Fax: 514 738 4436 david.gelf...@memotec.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Real product interference source at 121 MHz
This is a multi-part message in MIME format. 121.5 MHz is the emergency com channel and the ELT alert channel for aviation. Might be bleed over? Michael Sundstrom NOKIA TCC Dallas / EMC of: (972) 374-1462 cell: (817) 917-5021 amateur call: KB5UKT --- Begin Message --- This attachment, originally named Message Text, was removed because it is zero length. --- End Message ---
Re: Real product interference source at 121 MHz
121.0 is used by Aircraft and ATC -- I do know it's a tower frequency in
Austin Texas and probably in other locations as well...
Best Regards,
Mike Hopkins
From: "Kurt Fischer"
To:
Sent: Tuesday, February 11, 2003 10:02 AM
Subject: Real product interference source at 121 MHz
> Hello all,
>
> A strange request but this has become an interference issue with a
sattelite communications link There seems to be a very strong interferer at
121 MHz that is intermittent in nature and physically located in Northern
USA/Canada.
>
> It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
>
> Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
> It does appear to getting worse and is spreading geographically as well.
>
> Regards,
> Kurt Fischer
> Hyper Corp
> N,j袱^ AȞ#ˡ&zܓyg뤉ƥ
> ^y\v+ 㱺"ﬢybb竲+h nȭya 0{by種̡ޙ?㗦\훪: jw *.˛
> بǧvf&j:+v楉瞢0m㠅" ^綖){.n+缉lꊵh㷮ǧvf-㫅b붲)²ڶF㮉렭צr-r z(&
> 㱫 u֯z֭ah%̪-銉̱ݙbrtۭzxy+!ziﳠ^'z!笊ⱷ
p{Ǣ{^㉞+bwWr-r,)౪j鹷!jwlyꎪz椉 maꊶﳠ 0r綉x(l
>
This message is from the IEEE EMC Society Product Safety
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Re: Real product interference source at 121 MHz
Kurt, Can you be more precise? Is it really 121.000 MHz? There are a number of low-power, possibly even individually compliant, digital sources which could be heard around 121 MHz; knowing the exact frequency would allow pinning it down to one of several clock frequencies, if it is such a source. Please reply in ASCII format. Thanks, Cortland Kurt Fischer [SMTP:kurt.fisc...@hyperinterop.com] wrote > -Original Message- > A strange request but this has become an interference issue with a > sattelite communications link There seems to be a very strong interferer > at 121 MHz that is intermittent in nature and physically located in > Northern USA/Canada. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Real product interference source at 121 MHz
I recall that the FCC found a problem in this frequency range in the
Northwest a few years ago that was related to powerlines.
Of course, a directional antenna, spectrum analyzer, and a van would be
useful...
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 9:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,j^ AȞ#ۜ&zܓygƥ
^y霦\v+ "ybb+h nȭya 0{by種ޙ?\: jw *.˛بǧvf&j:+v瞢0m"
^){.n+lhǧvf-b֝)ڶFωצr-r z(&
u֯z֭ah%̪-ݙbrtۭzxy+!zi^'z! p{{^+bwWr-r,)౪j!jwly܅z ma 0rx(ޙl
This message is from the IEEE EMC Society Product Safety
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RE: Real product interference source at 121 MHz
Hi,
You might want to poll some of the FCC Open Air Test Sites (OATS) in the
area and see if they have noticed it as a new ambient. Using multiple site
data, you might be able locate where the emitter is and when it started to
become a problem.
Your results might be very surprising.
Philip Ross Wellington
Mgr. Signal Integrity & EMI
L-3 Communications CSW
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 8:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,j^ A⁐Ȟ#ˡ&zܓygࠉƥ
^y瑴\v+ 鲺"쮢ybb荲+h nȭya⁴ 0{by種̡ޙ?鲦\挮: jw *.˛
بǧvf&j:+vࠉ瞢0mᴅ" ^崖){.n+奉l荵hᲮǧvf-ࠅb鰲)²ڶF饭צr-r z(&
龫 繾u֯z֭ah%̪-̱ݙbrtۭzxy+!zi繾^'z!驊ⱷ
p{⥕Ǣ{^쯞+bw驀Wr-r,)౪j龷!jwly龪z龉 ma龶繾 0r龉x(繾l
This message is from the IEEE EMC Society Product Safety
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RE: Real product interference source at 121 MHz
121 MHz is an aviation voice communication band, in fact, 121.5 MHz is the
international emergency frequency. Doesn't sound like something that would
go unnoticed for very long.
Good Luck,
Ed
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 10:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,jࢱ^ A㘸Ȟ#ˡ&zܓyg༉ƥ
^y汬\v+ 鮺"ybb鄲+h nȭya睷 0{by種̡ޙ?᪦\扺: jw *.˛
بǧvf&j:+v岉瞢0m䱅" ^䱖){.n+༉lᎵh鄮ǧvf-咅b䬲)²ڶF䱉퓭צr-r z(&
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p{쥕Ǣ{^鰞+bw鰀Wr-r,)౪j!jwly遪zᔉ ma塶汥 0r騉x(⼼l
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RE: Real product interference source at 121 MHz
121MHz is in the VHF aeronautical communications band, maybe a new airport
or airway?
Chris Colgan
Compliance Engineer
TAG McLaren Audio Ltd
The Summit, Latham Road
Huntingdon, Cambs, PE29 6ZU
*Tel: +44 (0)1480 415 627
*Fax: +44 (0)1480 52159
* Mailto:chris.col...@tagmclaren.com
* http://www.tagmclaren.com
> -Original Message-
> From: Kurt Fischer [SMTP:kurt.fisc...@hyperinterop.com]
> Sent: Tuesday, February 11, 2003 3:03 PM
> To: emc-p...@majordomo.ieee.org
> Subject: Real product interference source at 121 MHz
>
> Hello all,
>
> A strange request but this has become an interference issue with a
> sattelite communications link There seems to be a very strong interferer
> at 121 MHz that is intermittent in nature and physically located in
> Northern USA/Canada.
>
> It could be the marketing of a non-compliant consumer products or perhaps
> some after market sattelite rec. retro-fit kit??
>
> Has anyone else had this experience in the last year --- (the problem was
> not present 2 years ago)?
> It does appear to getting worse and is spreading geographically as well.
>
> Regards,
> Kurt Fischer
> Hyper Corp
> N,j?^ A??#?&z?yg??
> ^y\v+ ?"?ybb?+h n?ya?0{by?\?: jw *.?
> ?gvf&j:+v??0m?" ^?)?{.n+?l?h?gvf-?b?)²?F???r-r z(&
> ? ?u?z?ah%?-?_?brt?zxy+?!zi?^'z!??p{??{^?+bw
> Wr-r,)?j?!jwly?z? ma??0r?x(?l
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exclusion of any other terms and conditions.
TAG McLaren Audio Ltd
The Summit, 11 Latham Road
Huntingdon, Cambs, PE29 6ZU
Telephone : 01480 415600 (+44 1480 415600)
Facsimile : 01480 52159 (+44 1480 52159)
**
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RE: Real product interference source at 121 MHz
>-Original Message-
>From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
>Sent: Tuesday, February 11, 2003 7:03 AM
>To: emc-p...@majordomo.ieee.org
>Subject: Real product interference source at 121 MHz
>
>
>Hello all,
>
>A strange request but this has become an interference issue
>with a sattelite communications link There seems to be a very
>strong interferer at 121 MHz that is intermittent in nature
>and physically located in Northern USA/Canada.
>
>It could be the marketing of a non-compliant consumer products
>or perhaps some after market sattelite rec. retro-fit kit??
>
>Has anyone else had this experience in the last year --- (the
>problem was not present 2 years ago)?
>It does appear to getting worse and is spreading
>geographically as well.
>
>Regards,
>Kurt Fischer
>Hyper Corp
>N,j�^ A污Ȟ#ˡ&zܓyg峉ƥ
>^y汯\v+ "ྡྷybb�+h nȭya† >0{by種̡ޙ?�\慢: jw *.˛
>بǧvf&j:+v飉瞢0m䠅"^ࠖ){.n+娉l孵h�ǧvf-夅b�)²ڶF駉�צr-r z(&
>ྫ †u֯z֭ah%̪-銉̱ݙbrtۭzxy+!zi^'z!岊ⱷ p{ॕǢ{^Პ+bwᧀWr-r,)౪jᙷ
>!jwlyᥪz᥉ ma其⁅ >0r젉x(ഠl
>
Kurt:
Looks like you're also getting some interference to your sig!
Seriously, this is in the Aeronautical Mobile allocation, and I would think
that any unauthorized emissions at that frequency would be an extremely high
priority for FCC and FAA attention. IIRC, many airports have DF equipment to
quickly find local emissions. OTOH, if you are being harmed by an authorized
emitter, then you have a tough problem. Isn't 121.5 MHz allocated to EPIRB's
and ELT's? And I understand that these beacons are being slowly forced to a
400 MHz frequency?
I think you'll need to tell us more about your victim system and what you
know about the interfering source(s).
Regards,
Ed
Ed Price
ed.pr...@cubic.com
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
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RE: Real product interference source at 121 MHz
Kurt,
this could be aviation communications. AM voice is centered at about 121
MHz.
Dave
From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 8:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz
Hello all,
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada.
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
Regards,
Kurt Fischer
Hyper Corp
N,jࢱ^ AȞ#ˡ&zܓygƥ
^y\v+ :""ybb2+h nȭya 0{by種̡ޙ?&\: jw *.˛
بǧvf&j:+v 瞢0m" ^){.n+l5h.ǧvf-b2)²ڶF-צr-r z(&
+ u֯z֭ah%̪-ʉ̱ݙbrtۭzxy+!zi^'z!
ⱷ p{ॕǢ{^ +bwWr-r,)౪j7!jwly*z ma6 0rx(l
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