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RG393 coax

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Wed Oct 15, 2014 3:48 pm Post subject: RG393 coax

All,



In my as-yet-non-airworthy Europa, I’m about to replace the RG58 coax originally installed for COM and XPNDR antennas. Both my newly purchased COM and (mode “S”) XPNDR are part of the Dynon SkyView suite. Dynon sez the RG58…though perhaps adequate for the COM...will be very unsatisfactory for the XPNDR, and the folks there refer me to “Antenna Cable”, p. 230, (chap 11-p.12) in the SkyView installation guide where various coax cables are considered.



(I cannot seem to include a link to the SkyView Installation Guide)



On p. 231, (chap.11-p.13) there is a chart which appears to state that RG400 (M17/128) is fine IF its length is less than 8’-4”. I find that this M17/128 is the spec. for the RG400 sold by suppliers like Aircraft Spruce, SteinAir, and B & C.

The chart also lists an RG304 for lengths up to 12’6”, and RG393 for lengths up to 17’-3”.

There is also a link below the chart to manufacturer’s data which is more specific…there is clearly a special realm reserved for coax cables. 

I’ve located a source for the RG393 where I can buy a minimum of 100 feet at $6.89/ft…and I’m having trouble swallowing. 

I’m skeptical of the notion that SkyView customers are using coax other than the widely available RG400 (M17-128), and I’m VERY reluctant to spring for this RG393. I do intend to replace ALL of my RG58.

Can someone who has some keen knowledge on this subject give me some guidance?

…with appreciation,

Fred

 [quote][b]

- The Matronics Europa-List Email Forum -

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Wed Oct 15, 2014 4:55 pm Post subject: Re: RG393 coax

Sounds like gilding the lily to me.  



It's just a question of attenuation at the

1 GHz range.  My SL-70 uses RG-400 just fine.  Is Dynon suggesting that 

their transponder output power is weak and they need every femtowatt to not 

be lost in cable?

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_________________
Ira N224XS

gregoryf.flyboy(at)comcas
Guest

Posted: Thu Oct 16, 2014 10:26 am Post subject: RG393 coax

Fred,

 FWIW, I am using RG58 for all com purposes. Should be  perfectly adequate as long as its kept in good shape. Its light and cheap, so it  can be easily replaced someday.

 The XPNDR will have a better quality cable, but haven't got it  yet. Maybe there is a avionics shop around that you can find to be able to buy  the better stuff by the foot without going the $689.00 route? Thats  ridiculus!  I've had food that's hard to swallow, that stuff makes one want  to choke. I would try to keep the RG400 to less than 8' 4" just to save the  expense.

  

 There is a avionics shop not too far from me, if you'd like  I  can check on the cable cost/availability of RG400 or RG393 if you'd  like. I am pretty sure they sell by the foot, as I've already  bought a bunch of RG58 bulk from them that way. I could ship it  to you, if the numbers come out.

 Regards,

 Greg



   From: owner-europa-list-server(at)matronics.com  [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Fred  Klein

Sent: Wednesday, October 15, 2014 4:47 PM

To:  europa-list(at)matronics.com; AeroElectric-List Digest Server

Subject:  RG393 coax

 

All, 



 In my as-yet-non-airworthy Europa, I’m about  to replace the RG58 coax originally installed for COM and XPNDR antennas. Both  my newly purchased COM and (mode “S”) XPNDR are part of the Dynon SkyView  suite. Dynon sez the RG58…though perhaps adequate for the COM...will be very  unsatisfactory for the XPNDR, and the folks there refer me to “Antenna  Cable”, p. 230, (chap 11-p.12) in the  SkyView installation guide where various coax cables are  considered.

 



 

(I cannot seem to include a link to the SkyView Installation  Guide)

 

 



 On p. 231, (chap.11-p.13) there is a chart  which appears to state that RG400 (M17/128) is fine IF its length is less than  8’-4”. I find that this M17/128 is the spec. for the RG400 sold by suppliers  like Aircraft Spruce, SteinAir, and B & C.

 



 The chart also lists an RG304 for lengths up  to 12’6”, and RG393 for lengths up to 17’-3”.

 



 There is also a link below the chart to  manufacturer’s data which is more specific…there is clearly a special realm  reserved for coax cables. 

 



 I’ve located a source for the RG393 where I  can buy a minimum of 100 feet at $6.89/ft…and I’m having trouble  swallowing. 

 



 I’m skeptical of the notion that SkyView  customers are using coax other than the widely available RG400 (M17-128), and  I’m VERY reluctant to spring for this RG393. I do intend to replace ALL of my  RG58.

 



 Can someone who has some keen knowledge on  this subject give me some guidance?

 



 …with appreciation,

 



 Fred

[quote]



[b]

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Thu Oct 16, 2014 1:38 pm Post subject: RG393 coax

On Oct 16, 2014, at 11:24 AM, Greg Fuchs <gregoryf.flyboy(at)comcast.net (gregoryf.flyboy(at)comcast.net)> wrote:

 	  Quote: 	
		       Fred,

 FWIW, I am using RG58 for all com purposes. Should be  perfectly adequate as long as its kept in good shape. Its light and cheap, so it  can be easily replaced someday.

 The XPNDR will have a better quality cable, but haven't got it  yet. Maybe there is a avionics shop around that you can find to be able to buy  the better stuff by the foot without going the $689.00 route? Thats  ridiculus!  I've had food that's hard to swallow, that stuff makes one want  to choke. I would try to keep the RG400 to less than 8' 4" just to save the  expense.



	




Thanks Greg…as for the RG393, Bob Nuckolls (at) AeroElectric had this to say:

 	  Quote: 	
		  Who ever called out RG-393 for a general aviation

antenna installation should be banished for 30 days

to eat lunch at McDonalds. This stuff has a 10AWG

center conductor and an outside diameter of 0.4"



If the coax was FREE, you'd still have to find connectors

and tools to install them . . . lots of $thrashing$ around

just to get 1db of loss in a 10' run at GPS frequencies.

	


	I’m going to order some RG400 (M17/128) for my XPNDR…and keep it in the raceway alongside the 4AWG feeders to keep the run as short as possible. In doing so, I am relying on my memory of an older post of Bob’s which stated, if I recall correctly, that there is NO EVIDENCE of coax performance being compromised by adjacency to 12v power feeders. (Nuckolls has confirmed that this is correct.)

	And since my set up allows for swapping out the RG58 for my COM antenna anytime, I think I may just leave it in for now and replace it w/ RG400 only if problems show up.

	I’m having one of those days where I say, “…screw it…I want to get this puppy airborne…”

	Fred



 [quote][b]

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Sat Oct 18, 2014 1:56 am Post subject: Re: RG393 coax

More Urban myths! The whole reason coax is concentrically shielded is to 

prevent noise pickup, in or out! Besides there is NO noise to speak of from a Battery cable!



FWIW, SkyCrafters, near Bud's place sometimes gets in RG400 surplus rolls

They sell for less than a dollar a foot.

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_________________
Ira N224XS

erichdtrombley(at)juno.co
Guest

Posted: Sat Oct 18, 2014 8:20 pm Post subject: RG393 coax

 	  Quote: 	
		  Hi Fred,I have the Dynon transponder installed with RG58 coax.  I wasn't too excited about having to replace the coax so I thought I would give it a try with the existing RG59 cable.  While I can't speak to losses of the coax I haven't had any issues with the transponder or ATC complaints and I fly out of a towered field.  I also have their ADSB box, and the traffic and weather are fantastic. Erich TrombleyN28ET Classic Mono 914 	
  



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jeff(at)rmmm.net
Guest

Posted: Sat Oct 18, 2014 8:36 pm Post subject: RG393 coax

Hi Eric,

I have been thinking about a new panel. What size of screen or system did you buy and how was your transition to tapes compared to round gushes?  



Jeff RobertsEagleville Marketing

Jeff(at)eaglevillemarketing.com (Jeff(at)eaglevillemarketing.com)

Jeff(at)rmmm.net (Jeff(at)rmmm.net)

615-355-7575 Office

615-406-8651 Cell

On Oct 19, 2014, at 12:16 AM, Erich Trombley <erichdtrombley(at)juno.com (erichdtrombley(at)juno.com)> wrote:

[quote] 	  Quote: 	
		  Hi Fred,I have the Dynon transponder installed with RG58 coax.  I wasn't too excited about having to replace the coax so I thought I would give it a try with the existing RG59 cable.  While I can't speak to losses of the coax I haven't had any issues with the transponder or ATC complaints and I fly out of a towered field.  I also have their ADSB box, and the traffic and weather are fantastic. Erich TrombleyN28ET Classic Mono 914 	
  



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[b]

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Sun Oct 19, 2014 8:21 am Post subject: RG393 coax

On Oct 18, 2014, at 9:16 PM, Erich Trombley <erichdtrombley(at)juno.com (erichdtrombley(at)juno.com)> wrote:

 	  Quote: 	
		   	  Quote: 	
		  I have the Dynon transponder installed with RG58 coax.  I wasn't too excitedabout having to replace the coax so I thought I would give it a try with theexisting RG59 cable. While I can't speak to losses of the coax I haven't hadany issues with the transponder or ATC complaints and I fly out of a toweredfield.  I also have their ADSB box, and the traffic and weather are fantastic. 	
	
Erich…thanks for this data…reassuring on one hand while raising questions about the quality of the technical advice I’ve received from Dynon. As I’ve posted, I’m awaiting 10 ft. of RG400 for my XPNDR and will keep my RG58 for my COM.

You sound very happy w/ your SkyView…you don’t by any chance have the new 10” touch screen do you?…the TS is an option unavailable to me w/ my 7” screen...tough to keep up w/ change and the latest bells and whistles.

Fred

 [quote][b]

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