Today's Message Index:
----------------------
1. 01:27 AM - Re: Antenna Yak52 (Hans Oortman)
2. 08:49 AM - Re: Antenna Yak52 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
3. 11:20 AM - Re: Antenna Yak52 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
4. 11:49 AM - Re: Antenna Yak52 (Warren Hill)
Message 1
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| Subject: | Re: Antenna Yak52 |
Thanks Mark....I can not reach the guts of the antenna myself but found a
small guy who can.... Jan probably has still an antenna, so I'll wait what
he can find.
Buy the way: I hate matching networks, the only thing it does is match the
impedance but pulls down the efficiency....
I'll keep you posted!
Hans
Op 05-07-12 00:42, Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mark.bitterlich@navy.mil> schreef:
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> The stock Russian antenna has a small matching network inside. If you want to
> go to the effort, the radiator can be replaced. It is actually a threaded
> tapered rod. The best bet would be to ask around and see if you can find an
> old one that someone removed that you can just thread in and be done.
>
> Personally, I took the antenna off, then drilled the original plate for a more
> modern antenna and mounted it on the same plate. Doing it this way you really
> should not notice any damage to your paint? In any case, you would have to
> slice around the mounting plate so you could remove it. I think I have one
> that I could take pictures of for you, but it would take a few days since I am
> currently not home. If anyone else has pictures, I am sure that would help
> you much better than this email.
>
> Mark
>
>
> ________________________________
>
> From: owner-yak-list-server@matronics.com on behalf of Hans Oortman
> Sent: Wed 7/4/2012 5:11 PM
> To: yak-list
> Subject: Yak-List: Antenna Yak52
>
>
> Guys,
>
> Has anybody removed or swapped the antenna on a Yak52??
> Mine is broken and completely corroded so needs to be replaced.
> If I want to remove it, it means damaging the paint and I was wondering if
> only the radiator could be removed rather than the whole assembly??
> Pictures or drawings would be appreciated!
>
> Thanks!
>
> Hans O.
> RA3326K
> Netherlands
>
>
>
>
>
>
>
>
>
Message 2
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Concur, which is why I mounted a new antenna on there and took the old
one OFF! :-)
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Friday, July 06, 2012 4:23 AM
Subject: Re: Yak-List: Antenna Yak52
Thanks Mark....I can not reach the guts of the antenna myself but found
a
small guy who can.... Jan probably has still an antenna, so I'll wait
what
he can find.
Buy the way: I hate matching networks, the only thing it does is match
the
impedance but pulls down the efficiency....
I'll keep you posted!
Hans
Op 05-07-12 00:42, Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mark.bitterlich@navy.mil> schreef:
Point,
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> The stock Russian antenna has a small matching network inside. If you
want to
> go to the effort, the radiator can be replaced. It is actually a
threaded
> tapered rod. The best bet would be to ask around and see if you can
find an
> old one that someone removed that you can just thread in and be done.
>
> Personally, I took the antenna off, then drilled the original plate
for a more
> modern antenna and mounted it on the same plate. Doing it this way
you really
> should not notice any damage to your paint? In any case, you would
have to
> slice around the mounting plate so you could remove it. I think I
have one
> that I could take pictures of for you, but it would take a few days
since I am
> currently not home. If anyone else has pictures, I am sure that would
help
> you much better than this email.
>
> Mark
>
>
> ________________________________
>
> From: owner-yak-list-server@matronics.com on behalf of Hans Oortman
> Sent: Wed 7/4/2012 5:11 PM
> To: yak-list
> Subject: Yak-List: Antenna Yak52
>
>
> Guys,
>
> Has anybody removed or swapped the antenna on a Yak52??
> Mine is broken and completely corroded so needs to be replaced.
> If I want to remove it, it means damaging the paint and I was
wondering if
> only the radiator could be removed rather than the whole assembly??
> Pictures or drawings would be appreciated!
>
> Thanks!
>
> Hans O.
> RA3326K
> Netherlands
>
>
>
>
>
>
>
>
>
Message 3
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I might point out that physics is a problem here as well.
One piece of metal as an antenna cannot be made to provide a
characteristic impedance of 50 ohms from 118 to 136 MHz. You pretty
much have to come up a way around that issue. :-)
Mark
p.s. Go ahead Brian.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Friday, July 06, 2012 4:23 AM
Subject: Re: Yak-List: Antenna Yak52
Thanks Mark....I can not reach the guts of the antenna myself but found
a
small guy who can.... Jan probably has still an antenna, so I'll wait
what
he can find.
Buy the way: I hate matching networks, the only thing it does is match
the
impedance but pulls down the efficiency....
I'll keep you posted!
Hans
Op 05-07-12 00:42, Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mark.bitterlich@navy.mil> schreef:
Point,
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> The stock Russian antenna has a small matching network inside. If you
want to
> go to the effort, the radiator can be replaced. It is actually a
threaded
> tapered rod. The best bet would be to ask around and see if you can
find an
> old one that someone removed that you can just thread in and be done.
>
> Personally, I took the antenna off, then drilled the original plate
for a more
> modern antenna and mounted it on the same plate. Doing it this way
you really
> should not notice any damage to your paint? In any case, you would
have to
> slice around the mounting plate so you could remove it. I think I
have one
> that I could take pictures of for you, but it would take a few days
since I am
> currently not home. If anyone else has pictures, I am sure that would
help
> you much better than this email.
>
> Mark
>
>
> ________________________________
>
> From: owner-yak-list-server@matronics.com on behalf of Hans Oortman
> Sent: Wed 7/4/2012 5:11 PM
> To: yak-list
> Subject: Yak-List: Antenna Yak52
>
>
> Guys,
>
> Has anybody removed or swapped the antenna on a Yak52??
> Mine is broken and completely corroded so needs to be replaced.
> If I want to remove it, it means damaging the paint and I was
wondering if
> only the radiator could be removed rather than the whole assembly??
> Pictures or drawings would be appreciated!
>
> Thanks!
>
> Hans O.
> RA3326K
> Netherlands
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Re: Antenna Yak52 |
Mark,
As you know, a straight 1/4 wavelength vertical radiator has a relatively narrow
bandwidth. The SWR will be good at 1/4 and possibly 5/8 wavelength, but rises
quickly after that. There is no way to make a single element vertical antenna
efficient from 118 to 136 MHz. It can be tuned at the center frequency and we
just have to accept the high SWR towards the ends of the band. Also, the anodized
aluminum panels on the CJ do not always conduct well between each one.
The other weak point in aviation communications is the coax and the BNC connectors.
RG-58 is pretty lossy at 120 MHz and a poorly fashioned BNC connector easily
has a 1 to 2 dB insertion loss. For every 3 dB of loss the signal strength
is cut by 50%, outgoing and incoming. So... a non-resonant antenna with a shaky
counterpoise, two low quality, crimped BNC connectors on RG-58 coax and even
the best radio may seem less than adequate from 20 miles out.
The good news is that just about everything we do is line of sight and at these
frequencies it doesn't take much radiated power to maintain a reasonable signal
strength.
Warren
On Jul 6, 2012, at 11:17 AM, Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
wrote:
>
> I might point out that physics is a problem here as well.
>
> One piece of metal as an antenna cannot be made to provide a
> characteristic impedance of 50 ohms from 118 to 136 MHz. You pretty
> much have to come up a way around that issue. :-)
>
> Mark
>
> p.s. Go ahead Brian.
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
> Sent: Friday, July 06, 2012 4:23 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Antenna Yak52
>
>
> Thanks Mark....I can not reach the guts of the antenna myself but found
> a
> small guy who can.... Jan probably has still an antenna, so I'll wait
> what
> he can find.
>
> Buy the way: I hate matching networks, the only thing it does is match
> the
> impedance but pulls down the efficiency....
>
> I'll keep you posted!
>
> Hans
>
>
> Op 05-07-12 00:42, Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
> <mark.bitterlich@navy.mil> schreef:
>
> Point,
>> MALS-14 64E" <mark.bitterlich@navy.mil>
>>
>> The stock Russian antenna has a small matching network inside. If you
> want to
>> go to the effort, the radiator can be replaced. It is actually a
> threaded
>> tapered rod. The best bet would be to ask around and see if you can
> find an
>> old one that someone removed that you can just thread in and be done.
>>
>> Personally, I took the antenna off, then drilled the original plate
> for a more
>> modern antenna and mounted it on the same plate. Doing it this way
> you really
>> should not notice any damage to your paint? In any case, you would
> have to
>> slice around the mounting plate so you could remove it. I think I
> have one
>> that I could take pictures of for you, but it would take a few days
> since I am
>> currently not home. If anyone else has pictures, I am sure that would
> help
>> you much better than this email.
>>
>> Mark
>>
>>
>> ________________________________
>>
>> From: owner-yak-list-server@matronics.com on behalf of Hans Oortman
>> Sent: Wed 7/4/2012 5:11 PM
>> To: yak-list
>> Subject: Yak-List: Antenna Yak52
>>
>>
>> Guys,
>>
>> Has anybody removed or swapped the antenna on a Yak52??
>> Mine is broken and completely corroded so needs to be replaced.
>> If I want to remove it, it means damaging the paint and I was
> wondering if
>> only the radiator could be removed rather than the whole assembly??
>> Pictures or drawings would be appreciated!
>>
>> Thanks!
>>
>> Hans O.
>> RA3326K
>> Netherlands
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
>
>
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