Today's Message Index:
----------------------
1. 04:52 AM - Re: Finnish people (Raimo Toivio)
2. 05:24 AM - Re: Antenna tuning (Bill & Sue)
3. 09:54 AM - Re: Stage 1 Parts For offer (flying farmer)
4. 01:01 PM - Re: Antenna Tuning (Fergus Kyle)
5. 02:37 PM - Re: Fuel dripping from airbox 914 ? (Frans Veldman)
6. 02:45 PM - Re: Antenna tuning (Frans Veldman)
7. 03:02 PM - Re: Fuel dripping from airbox 914 ? (Bob Borger)
Message 1
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Subject: | Re: Finnish people |
Finnish peopleThanks Ferg,
all the Finnish people make a low bow to you.
Raimo
----- Original Message -----
From: Fergus Kyle
To: 5EUROPALIST
Sent: Saturday, March 27, 2010 4:33 PM
Subject: Europa-List: Finnish people
Quote,
"There are many Finnish people...
Raimo"
Not nearly enough in my opinion, remembering the Mannerheim Line.
Ferg
Message 2
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Subject: | Re: Antenna tuning |
Dave,
I'm afraid I can't help much with the length either as I haven't put the antenna
in our our Europa yet ( I should be filling right now!) and anyway I ignored
the Europa design (not that there is anything wrong with it) and made an aerial
of my own design for fun -it came out well, but won't help in sizing your antenna.
I agree with Jim, the length quoted sounds a bit short- I would have expected about
55cm per leg, less a bit for the dielectric effects of mounting it on fibreglass.
So maybe the final length in the book is about right, but I would be
inclined to start a bit longer and cut to size.
The suggestion of drawing a graph is a good one to allow you to visualise where
you are starting from.
One piece of reassurance- you can mess with the length all you like and it is very
hard indeed to damage anything (a bit like fibreglass you can stick another
bit on and have second crack at cutting it to size!) and, although it is nice
to get it just so, small errors in the end result are likely to be unnoticeable
in practice.
PS Hi Jim, we met in NZ but I didn't realise you were a Ham too- small world!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=292181#292181
Message 3
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Subject: | Re: Stage 1 Parts For offer |
All Interested
Some has asked for the size of the Torque Tube. The Tube measures 38mm OD, The
Sleeves (TP5, TP6) Measure 41.25mm OD the brass Bush (TP11) measures 40.75mm ID
Ebay also listed my Items incorrectly so I have had to re list them here http://shop.ebay.co.uk/g-irpw/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p4340
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=292234#292234
Message 4
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Subject: | re: Antenna Tuning |
Cheers,
I might mention something while tuning an antenna which might make
some difference. Normally an antenna up and clear will reflect the
qualities desired. But at our freqs, it=92s important to ensure that
nothing
resembling a nearby freq exists within about a =BD to 5/8 wavelength ( a
bit
less) ' say 300/127 m or something less than 1.5m. All this depends on
orientation etc, so if a UHF or higher ferq is off the end of your
tailplane
dipole, not much loss of a spherical power plot. BUT if you insert a
=BC-wave
vertical in the plane of the diploe within a meter or so, expect the
pattern
of the latter=92s power plot to be skewed and it won=92t radiate
spherically '
that is pieces of the pattern will be missing power (maybe straight
ahead
and you have to turn the a/c 30 degrees to get the tower ahead to pay
attention). High is assumed but clear is also needed.
Nuff sed.
ferg
Message 5
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Subject: | Re: Fuel dripping from airbox 914 ? |
On 03/26/2010 05:51 PM, Bob Borger wrote:
> Off the top of my head, I'd guess a sticky float or restriction in the fuel return
line.
It appeared to be a sticky float or valve. I took the carb out, cleaned
it although I couldn't find anything serious that could have clogged the
valve or float, just some residu left from evaporated fuel. Apparently
that did it, no more fuel overflow, and the engine, after rebalancing
the carbs, ran fine.
My previous problem after a long pause, oil seeping into the turbo
housing to be blown out at the first start, was this time almost non
existent. Just a little bit of oil was collected in 4 months, far less
than previous winter stop. I guess it was indeed a seal that needed to
"settle".
So, first flight can be performed any time now, as soon as weather and
testpilots cooperate. ;-)
Frans
Message 6
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Subject: | Re: Antenna tuning |
On 03/26/2010 10:43 PM, david park wrote:
> I have just borrowed an SWR meter and am trying to tune my Comm
> antenna. The manual says to tune by shortening until minimum reading at
> 127.50
Well, somewhat contrary to what others tell you, I wouldn't make a big
deal out of it. You just need to verify that the SWR is no higher than
2.5 anywhere in the frequency spectrum you intent to use. No need to
make a graph in my opinion, just dial through the band, transmit on
every 100kHz to verify that the SWR is acceptable.
HAM's usually strive to perfection, but you aren't going to moon-bounce,
DX, trying to reach the other end of the world with 1 milliwatt, or
working with satellites.
You have 10 Watts or so to spoil, have a very short cable in comparison
to HAM-stations, are transmitting from a height HAM's usually can only
dream upon, and without obstacles in your transmission path.
You won't notice any SWR improvement from 1:2.5 to 1:1, even with a
lossy cable. Just relax.
BTW, I'm a HAM myself.
The real challenge in airplanes is to keep the interference between
avionics and your signal as minimal as possible, so spend your time on
that, rather than chasing the perfect SWR.
Just my 2 cents.
Frans
Message 7
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Subject: | Re: Fuel dripping from airbox 914 ? |
Frans,
Great! Now lay in some aspirin to take care of the sore muscles in your face from
the grin you are about to develop.
Wishing you light breezes and severe clear. Have a great first flight.
Bob Borger
On Monday, March 29, 2010, at 04:28PM, "Frans Veldman" <frans@privatepilots.nl>
wrote:
>
>On 03/26/2010 05:51 PM, Bob Borger wrote:
>
>> Off the top of my head, I'd guess a sticky float or restriction in the fuel
return line.
>
>It appeared to be a sticky float or valve. I took the carb out, cleaned
>it although I couldn't find anything serious that could have clogged the
>valve or float, just some residu left from evaporated fuel. Apparently
>that did it, no more fuel overflow, and the engine, after rebalancing
>the carbs, ran fine.
>
>My previous problem after a long pause, oil seeping into the turbo
>housing to be blown out at the first start, was this time almost non
>existent. Just a little bit of oil was collected in 4 months, far less
>than previous winter stop. I guess it was indeed a seal that needed to
>"settle".
>
>So, first flight can be performed any time now, as soon as weather and
>testpilots cooperate. ;-)
>
>Frans
>
>
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