Hi Carl
Believe Fred he is completely correct on this issue.
I recall doing a training course on the then new transistorised IFF coder
whilst in the RAF a considerable number of years ago. From memory the
individual pulses for mode A and Ident ( and I assume for mode C ) are each
less than a microsecond long and a transmission of a peak power of about 700
Watts ( as in my transponder ) will give a mean power of just a couple of
watts.
I will let you do the sums about all this in your own time but your comment
that that it adds up to a significant sum is in my view wrong and misleading
.
Like you I am not an expert on these issues so I tend to leave it to others
to offer advice.
Tim H
No 10
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Carl
Pattinson
Sent: 15 July 2007 20:03
Subject: Re: Europa-List:Transponders
<carl@flyers.freeserve.co.uk>
I was always given to believe that RF from transponders was fairly potent
stuff but im no expert and I dont know how it compares to mobile phones or
comms radios.
Its not continuous but must add up to quite a bit. Comms
transmission on the other hand would amount to a couple of minutes per hour
for most of us.
But if you say transponder antennas are relatively safe then I guess you
know what you are talking about. Fortunately no amount of RF is going to
affect me in the parenting department - I had the snip 30 years ago ! - and
the grand children are someone elses responsibility.
Carl Pattinson
G-LABS
----- Original Message -----
From: "europa flugzeug fabrik" <n3eu@oh.rr.com>
Sent: Sunday, July 15, 2007 2:58 PM
Subject: Re: Europa-List:Transponders
> <n3eu@oh.rr.com>
>
>
> carl@flyers.freeserve. wrote:
>> ...(ie: move it closer to the cockpit) - unless you are planning to have
>> kids !!!!!
>>
>> Remember that unlike a comms radio a transponder transmits continuously
>> so the exposure to radiation is greater.
>
> No, it does not transmit continuously, but only bursts of a few
> milliseconds (at partial duty cycle) only when our reply lamp blinks in
> response to an ATC radar sweep. If we do the math on RF exposure, we
> absorb more RF energy from a cell phone than a transponder antenna a few
> feet away.
>
> Fred F.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=123903#123903
>
>
15:36
15:36
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