[TowerTalk] Rotor loop coax choices ?

[Mark Spencer]

Gerald:

In most cases double or single shielding is probably a non issue for me at HF so long as I use "high quality" single shielded cable.  

That being said, I have found that on occasion some single shielded cable I have acquired has been quite poor, where as the double shielded cable I've purchased over the years has been of consistently high quality (so far.)   

I also operate at VHF and up at fairly high power levels with low noise pre amps and have some concerns about overloading the preamps due to leakage to and from cables.   

The sticker shock of new RG 214 (and the associated connectors) is causing me to re think my default approach of running double shielded cables all the way from the radios to the antennas including the runs past the rotors/

I've had some other non ham radio experiences over the years that cause me to appreciate the virtues of the dual braided silver covered shields  of the RG 214 and RG 400 varieties of coax but again none of this is likely relevant for me at HF.

Sent from my iPhone

> On Jun 11, 2015, at 6:46 PM, TexasRF at aol.com wrote:
> 
> Hi Mark, what is the concern for double shielded rotor loops? I realize it will not hurt anything to use double shielded cable for that but why is that an issue?
>  
> 73,
> Gerald K5GW
>  
>  
> In a message dated 6/11/2015 7:02:23 P.M. Central Daylight Time, mspencer12345 at yahoo.ca writes:
> Thanks all for the comments and suggestions.  Re the length I typically run the "rotor loop" all the way to the antenna feed point (rather than just using it to by pass the rotor.)  
> 
> The suggestion to use short rotor loops does have a lot of merit if I am going to buy RG 214 style coax or something similar.   
> 
> I'll ponder the shielding issue some more.   Using high quality RG 213 style coax from before the rotor to the antenna feed point may well be the way to go if I don't want to pay for the double shielded cable with silver covered conductors.  
> 
> Best regards
> Mark S
> 
> VE7AFZ
> 
> Sent from my iPhone
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