Today's Message Index:
----------------------
1. 05:55 AM - Transponder suppression (N4ZQ)
2. 08:44 AM - Re: Coaxial Cable (Robert L. Nuckolls, III)
3. 09:29 AM - Re: Coaxial Cable (Robert L. Nuckolls, III)
4. 06:07 PM - Re: Coaxial Cable (donjohnston)
5. 09:07 PM - Re: Coaxial Cable (Art Zemon)
6. 10:40 PM - Re: Coaxial Cable (don van santen)
7. 11:03 PM - Re: Coaxial Cable (Bernie Willis)
Message 1
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| Subject: | Transponder suppression |
Way back when, during my Lancair 360 build, I installed an Apollo SL70 transponder
as well as a Ryan 9900BX TCAD box.
The Ryan schematic called for a suppression connection line between the appropriate
pin on each unit. However, the 9900BX
occasionally paints me as a target in the center of my display at same alt and
zero distance. I consider this to be unacceptable and wonder if any of you can
suggest a solution.
Thanks,
Angier Ames
Message 2
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At 07:41 PM 2/22/2017, you wrote:
> > If you just gotta do it,
>
>Yep=85when ya gotta=85ya just gotta=85
>
>This is a new install of transponder and ADS-B.
>
>Thanks for the advice. I definitely need to
>measure out the EXACT length of cable that I
>need (plus a little bit more for mama and the
>kids) as the RG400 is kinda pricey. Hmmm, I
>guess the higher number of RG=92s means the more
>money it costs?!?!? I was hoping for more like an RG4.
>
>Anyhoo, thanks for the advice.
>
There's a new kid on the coax block with materials
similar to RG58 but with some modifications that
improve leakage (100% shield) and loss (2/3 that
of RG58).
I use in on my ham radio antennas both fixed
an mobile. There are companies that will supply
select lengths with connectors already installed
for very reasonable prices. Case in point:
http://tinyurl.com/zfxz7m7
If it were my airplane . . .
Bob . . .
Message 3
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At 10:40 AM 2/23/2017, you wrote:
>At 07:41 PM 2/22/2017, you wrote:
>> > If you just gotta do it,
>>
>>Yep=85when ya gotta=85ya just gotta=85
>>
>>This is a new install of transponder and ADS-B.
>>
>>Thanks for the advice. I definitely need to
>>measure out the EXACT length of cable that I
>>need (plus a little bit more for mama and the
>>kids) as the RG400 is kinda pricey. Hmmm, I
>>guess the higher number of RG=92s means the more
>>money it costs?!?!? I was hoping for more like an RG4.
>>
>>Anyhoo, thanks for the advice.
>>
>
> There's a new kid on the coax block with materials
> similar to RG58 but with some modifications that
> improve leakage (100% shield) and loss (2/3 that
> of RG58).
>
> I use in on my ham radio antennas both fixed
> an mobile. There are companies that will supply
> select lengths with connectors already installed
> for very reasonable prices. Case in point:
>
>http://tinyurl.com/zfxz7m7
>
> If it were my airplane . . .
P.S. Forgot to mention, LMR-195 is compatible
with the legacy line of connectors and tooling
for RG-58/400/141 coaxes. But the last time
I needed a couple of 195 coaxes, I ordered one
with connectors already installed and long enough
to cut in two. Only needed to install two connectors
myself.
Bob . . .
Message 4
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| Subject: | Re: Coaxial Cable |
billhuntersemail(at)gmail wrote:
> What kind of coaxial cable, set of crimp tools, and ends do you all recommend?
I pulled RG400 throughout. It costs a bit more, but unless you want to do it again...
As for the connectors, that's dependent on the equipment. I've got some BNC and
some TNC. Just get good quality connectors and use a good crimper.
And check every single connector you put on! [Embarassed]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466563#466563
Message 5
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| Subject: | Re: Coaxial Cable |
Folks,
I have been following this thread because I, too, am trying to decide which
coax to buy for my plane. I'm a computer engineer; I shied away from EE in
college and especially antenna design because... well... I heard that
antenna designers were a special kind of crazy.. :-)
Seriously, though, if I understand correctly, in the context of an
installation in a homebuilt airplane, the biggest difference between RG58
and RG400 seems to be that the RG400 is less loss-y. Yes? In other words,
if an antenna puts a weak signal in one end of the coax, the signal that
reaches the radio receiver will be stronger if the coax is RG400 than if it
is RG58.
I'm looking at 10 feet of coax from the GPS and comm antennas to the
receivers, including service loops. I am looking at 20 feet for the VOR/GS
antenna. The transponder antenna will be less than 10 feet.
At those distances, does RG400 vs RG58 matter? How do I evaluate it?
And then there is the LMR-195 that Bob just showed us. How does that fit in?
Thanks,
-- Art Z.
--
https://CheerfulCurmudgeon.com/
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 6
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| Subject: | Re: Coaxial Cable |
After Bob posted the info on the LMR-195 I looked for additional
information. One thing that seems a little strange is that it is solid
core. It is also said to be flexible. It was my understanding that solid
core cable is less flexible than multi strand cable. Any one know the
minimum bend radius for LMR-195?
Don.
On Feb 23, 2017 21:14, "Art Zemon" <art@zemon.name> wrote:
> Folks,
>
> I have been following this thread because I, too, am trying to decide
> which coax to buy for my plane. I'm a computer engineer; I shied away from
> EE in college and especially antenna design because... well... I heard that
> antenna designers were a special kind of crazy.. :-)
>
> Seriously, though, if I understand correctly, in the context of an
> installation in a homebuilt airplane, the biggest difference between RG58
> and RG400 seems to be that the RG400 is less loss-y. Yes? In other words,
> if an antenna puts a weak signal in one end of the coax, the signal that
> reaches the radio receiver will be stronger if the coax is RG400 than if it
> is RG58.
>
> I'm looking at 10 feet of coax from the GPS and comm antennas to the
> receivers, including service loops. I am looking at 20 feet for the VOR/GS
> antenna. The transponder antenna will be less than 10 feet.
>
> At those distances, does RG400 vs RG58 matter? How do I evaluate it?
>
> And then there is the LMR-195 that Bob just showed us. How does that fit
> in?
>
> Thanks,
> -- Art Z.
>
> --
> https://CheerfulCurmudgeon.com/
>
> *"If I am not for myself, who is for me? And if I am only for myself, what
> am I? And if not now, when?" Hillel*
>
Message 7
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| Subject: | Re: Coaxial Cable |
I=99ve got to submit my two cents worth on the conversation about
coax. As an A&P IA what I hate the most is having to do something over
because I did it wrong. Typically coax is under the floor boards or
above the head liner. Most times it goes places where its hard to get
at and left there. The extra money for the best is soon forgotten but
the frustration for replacement just goes on and on.
The radio shop in our area, which is very busy, urges RG400. The
installation money is all the same to me.
Bernie
> On Feb 23, 2017, at 9:36 PM, don van santen <donvansanten@gmail.com>
wrote:
>
> After Bob posted the info on the LMR-195 I looked for additional
information. One thing that seems a little strange is that it is solid
core. It is also said to be flexible. It was my understanding that solid
core cable is less flexible than multi strand cable. Any one know the
minimum bend radius for LMR-195?
> Don.
>
> On Feb 23, 2017 21:14, "Art Zemon" <art@zemon.name
<mailto:art@zemon.name>> wrote:
> Folks,
>
> I have been following this thread because I, too, am trying to decide
which coax to buy for my plane. I'm a computer engineer; I shied away
from EE in college and especially antenna design because... well... I
heard that antenna designers were a special kind of crazy.. :-)
>
> Seriously, though, if I understand correctly, in the context of an
installation in a homebuilt airplane, the biggest difference between
RG58 and RG400 seems to be that the RG400 is less loss-y. Yes? In other
words, if an antenna puts a weak signal in one end of the coax, the
signal that reaches the radio receiver will be stronger if the coax is
RG400 than if it is RG58.
>
> I'm looking at 10 feet of coax from the GPS and comm antennas to the
receivers, including service loops. I am looking at 20 feet for the
VOR/GS antenna. The transponder antenna will be less than 10 feet.
>
> At those distances, does RG400 vs RG58 matter? How do I evaluate it?
>
> And then there is the LMR-195 that Bob just showed us. How does that
fit in?
>
> Thanks,
> -- Art Z.
>
> --
> https://CheerfulCurmudgeon.com/ <https://cheerfulcurmudgeon.com/>
>
> "If I am not for myself, who is for me? And if I am only for myself,
what am I? And if not now, when?" Hillel
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