Today's Message Index:
----------------------
1. 07:27 PM - Re: GNS 430W Antenna Requirements (reichec)
2. 07:52 PM - Re: GNS 430W Antenna Requirements (Bob C.)
3. 08:59 PM - Re: GNS 430W Antenna Requirements (Wayne Sweet)
Message 1
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| Subject: | Re: GNS 430W Antenna Requirements |
The input signal to the 430w must be at a maximum XdB (some number) the antenna
has a gain factor of like 25dB and therefore there must be some loss to get
it down to XdB thus 13 feet.. I beleive the magic number at the reciever is
20dB signal strength but not sure.
Got it?
Charles
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=108788#108788
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| Subject: | Re: GNS 430W Antenna Requirements |
I doubt that it's to attenuate the signal as suggested? More like
it's to avoid having the feedline (coax) be susceptible to picking
interference (acting like an antenna) at certain frequencies? I
wouldn't worry so much why but I'd follow there suggestions.
Regards,
Bob in SE Iowa
RV-8 Finishing - Slowly
On 3/9/07, bakerocb@cox.net <bakerocb@cox.net> wrote:
>
> 3/9/2007
>
> Hello List Experts, It is fairly well documented that Garmin wants high
> quality antenna cable (RGU 142 or 400) to be used for the GNS 430W and it
> must be between 13 and 35 feet long.
>
> I can understand a maximum limit. I cannot understand the physics or
> electronic principles behind the minimum length requirement.
>
> Can someone please educate me? Thanks.
>
> OC -- The best investment we can make is the effort to gather and understand
> knowledge.
>
>
Message 3
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| Subject: | Re: GNS 430W Antenna Requirements |
I have my GNS430W installed with the antenna mounted on the aft of the
canopy (BUSHBY MustangII); the RG400 coax is about 8 feet in length. No
noticeable difference from the same location prior to the WAAS update.
BTW, I'm having a ball flying GPS approached with ILS like display. In fact
the needles are much calmer than on a ILS approach, and no worry about false
lobes. :-))) Only problem (small), from the approach plate can't tell if
there will be an active GS till I get on the approach and get the LNAV+V
indication. The GS comes active on the waypoint just outside the FAF.
Wayne
----- Original Message -----
From: "Bob C. " <flyboy.bob@gmail.com>
Sent: Monday, April 23, 2007 7:51 PM
Subject: Re: Avionics-List: GNS 430W Antenna Requirements
>
> I doubt that it's to attenuate the signal as suggested? More like
> it's to avoid having the feedline (coax) be susceptible to picking
> interference (acting like an antenna) at certain frequencies? I
> wouldn't worry so much why but I'd follow there suggestions.
>
> Regards,
> Bob in SE Iowa
> RV-8 Finishing - Slowly
>
> On 3/9/07, bakerocb@cox.net <bakerocb@cox.net> wrote:
>>
>> 3/9/2007
>>
>> Hello List Experts, It is fairly well documented that Garmin wants high
>> quality antenna cable (RGU 142 or 400) to be used for the GNS 430W and it
>> must be between 13 and 35 feet long.
>>
>> I can understand a maximum limit. I cannot understand the physics or
>> electronic principles behind the minimum length requirement.
>>
>> Can someone please educate me? Thanks.
>>
>> OC -- The best investment we can make is the effort to gather and
>> understand
>> knowledge.
>>
>>
>>
>>
>>
>>
>
>
>
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