Tim,
My preference is a matched pair of coaxial cables, 1 meter long, made
with RG-400/U (not RG-142/U!) double-shielded cable. Each end to have
crimped, silver-plated (not nickel-plated) "N" male connectors with
gold-plated center pins and Teflon dielectric. The crimp ferrules shall
be reinforced with two nested layers of adhesive-coated shrink tubing
for strain and flex relief.
When carefully constructed and characterized with a network analyzer,
these cables ensure that duplexer, isolator, cavity, and filter tuning
can be accurate and repeatable. The double shielding ensures that any
duplexer or cavity tuning done at a repeater site is not going to suffer
interference from a high-RF environment. The use of premium-quality
crimped connectors ensures that impedances are constant. Of course,
EP-10 plastic dust plugs are inserted into the connectors during
storage, to maintain cleanliness.
73, Eric Lemmon WB6FLY
[EMAIL PROTECTED] wrote:
> I want to build the ultimate set of test cables for working with
> repeaters and tuning duplexers. What are your recommendations?
> --
> -Tim
>
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