Jim (VE),
Where can I find this RFS corrugated cable (in red below)? The prices I
have found are triple what you mentioned.
I need to find some before the cold weather sets in.
Les W2LK
On 10/14/2010 4:23 PM, Jim Thomson wrote:
> Date: Thu, 14 Oct 2010 08:41:08 -0700
> From: Jim Brown<jim@audiosystemsgroup.com>
> Subject: Re: [TowerTalk] Crimped PL-259's
>
>> Almost no one except amateur radio and CB uses UHF (PL259) connectors
>> anymore.
>>
>> Therefore you will mostly find them in ham and CB shops (and ebay).
>>
> The inference here is that UHF connectors are somehow outmoded.
>
> ### They ARE outmoded. There is no standard for UHF connector's. If there
> was, they would all be useable, and they are not. The quality of UHF
> connector's
> varies from superb to pure junk. A lot of them are not 50 ohms. They can't
> be 70 ohms
> for RG-11 and 50 ohms for RG-213....at the same time.
>
>
>
> Nothing
> could be further from the truth. The FACT is that they are entirely
> satisfactory for systems operating below about 500 MHz, and
> mechanically, they have some significant advantages over most other coax
> connectors when installed on most coaxial cables .
>
> ### what mechanical advantages? They are not even waterproof !
>
>
>
>
> Those other newer connectors DO have advantages above 500 MHz, where
> their constant impedance characteristic matters, and where their small
> physical size takes up less space.
>
> Why is so much new equipment coming with N connectors, or with other
> smaller connectors? Mostly because that equipment operates at those
> higher frequencies, where their advantages DO matter.
>
> ### The only connector's offered for 7/8" and 1.25" heliax is
> type N... and 7-16 DIN. Andrew stopped making UHF males for
> 7/8" heliax back in the early 90's. The only connector you can get
> for LMR 1200 /1700 is type N and 7-16 DIN.
>
> ## 7/8" heliax and 1.25" heliax is the 2 x most common sizes you see
> in the cell industry. 7/8" RFS brand 7/8" heliax with a corrugated CU
> center conductor + outer conductor is aprx $2.35 per foot...cheap. Andrew
> doesn't even offer 7/8" heliax with a corrugated center conductor...only
> a copper tube. Ditto with 1.25" heliax.
>
> ##RFS also makes both 7/8" and 1.25" heliax with a corrugated Aluminum
> outer conductor..and corrugated copper inner conductor. Now this stuff is
> all
> the rage in EU/Asia/China/India..and now NA. The 7/8" version is aprx
> $1.48
> per foot ! it's only 22 lbs per 100' [ vs 45 lbs for LMR-1200DB] . The
> spec's are
> 99.8% as good as the stuff using CU for the outer conductor. Having a
> corrugated
> center conductor means it is a LOT more flexible than Andrew heliax [with
> it's rigid
> copper tube / kink prone]. From an install point of view, flexible,
> light,cheap heliax
> is the way to go.Braided cables will suck water up on their braids via
> capillary action.
>
> ## The cell industry has completely swapped over to 7-16 DIN. All the new
> gen 3+4
> eq is 7-16 Din. Type N is obsolete. 7-16 Dins are plentiful on the surplus
> market. You can't
> blow up a 7-16 Din on HF.
>
>
> Methinks that the poster of this comment needs to go back to study the
> fundamentals of transmission lines.
>
> ## I did. RG-213 won't work from the bottom of a tower to the top of a
> tower on 15M,
> and that assumes you have BIG stuff between house and base of tower] Hams
> have been
> brainwashed into thinking RG-213 + UHF connector's is some sorta 'standard'.
> Have folks
> ever put a wattmeter at the top of their tower's..and measured their
> power..... with
> exactly 1 kw CXR applied in the shack ?? They will get an eye opener, and
> then some.
>
>
>
> The ARRL Handbook and ARRL Antenna
> Book are a good place to start.
>
> ## The ARRL handbook and Ant book both need a serious re-write. Did
> they finally
> figure out how to build a balun ?
>
> Jim VE7RF
>
>
>
> 73, Jim K9YC
>
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>
>
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