[TowerTalk] Rotor loop coax choices ?

[Roger (K8RI) on TT]

On 6/11/2015 9:41 PM, TexasRF--- via TowerTalk wrote:

I've used BuryFlex for probably almost as long as its been around. At 
least since I became aware of it and Steve is a good guy to work with.

  Since becoming acquainted with its low loss ans very rugged jacket 
that's tough and slippery.   I now purchase 500' at a time, although 
that's the way I purchase most coax although I have purchased LMR-400 
and 600 in 1000' rolls

I no longer have the big array on the 100' 45G with a need for 5 runs of 
LMR-600, but with the addition of the LM470 I still have a use for 
plenty of runs and coax fittings.  I'd like to replace the 45G with a 
big crank up, but I think my wife would be upset if I tore up the yard 
with heavy machinery...again<:-))

For direct burial, I'd like a gel filled version of BuryFlex, but the 
jacket is so tough that its never been a problem.  I've had many a coax 
fail, but never any BuryFlex.

73

Roger (K8RI)

> Hi Jim, granted the loss is lower at HF but additional loss is still
> additional loss that could be avoided. I would not suggest replacing an  existing
> run of 8214 used on 80 meters. The time for that decision is when  the
> cable is purchased if one wants to get full value from the product.
>   
> I saw that Belden 8267 (RG213) has a non contaminating PVC jacket and that
> would represent good value especially for the lower bands where the loss is
>   already low.
>   
> I personally would choose Davis RF Buryflex over any of the Belden cables.
> The quality and low loss has been proven and without the need to fund an
> international marketing organization, the cost is substantially lower. I do
> sell  some Belden cable for those who insist on the brand.
>   
> 73,
> Gerald K5GW
>   
>   
>   
>   
>   
>   
> In a message dated 6/11/2015 7:18:41 P.M. Central Daylight Time,
> jim at audiosystemsgroup.com writes:
>
> Right.  I'm looking at the thick Belden catalog.  9251 is the only one
> that  is listed as non-contaminating.
>
> That said, how much of a problem is  that at HF? I wouldn't think much.
> At UHF, yes.
>
> 73, Jim  K9YC
>
> On Thu,6/11/2015 1:54 PM, TexasRF--- via TowerTalk wrote:
>>   Hi Jim, it is not widely known but Belden 8214 does not have a
>>   non-contaminating jacket.  I just confirmed it on the 8214 data sheet
> on  their website
>> to make sure I remembered it  correctly.
>>    
>> Too bad as it is a very nice coax  otherwise.
>>    
>> 73,
>> Gerald  K5GW
>>    
>>    
>>    
>> In  a message dated 6/11/2015 3:37:18 P.M. Central Daylight Time,
>>   jim at audiosystemsgroup.com writes:
>>
>> On  Thu,6/11/2015 1:16  PM, Mark Spencer wrote:
>>> I have nagging doubts about  using  cables with a solid foil shield for a
>> rotor loop.
>>
>> I  would share  your concern.
>>
>>> I do like the idea of  double shielded cables so  RG213, RG 8 etc are off
>> the table for  now.
>>
>> I wouldn't worry about  "double-shielding," but  rather the quality of the
>> shield. Look through the  Belden  catalog for an RG8 or RG213 with a
>> robust copper braid shield  and  stranded center. Look at 8237, 8268,
>> 8214. or 9251. All are  97% shield  coverage. Check out vendors like
>> Markertek. 9251 has  non-contaminating  jacket.  8214 is #11 center; the
>> others  are #13.
>>
>> You don't  need a lot of coax for the rotor  loop, so cost is hardly a
>> factor -- I'd  be more concerned about  finding someone to sell you short
>> lengths.  :)
>>
>>   73, Jim  K9YC
>>   _______________________________________________
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-- 

73

Roger (K8RI)


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