Bob, what's your opinion on right angle silver plated "N" connectors at
900 Mhz? Mike
Bob Dengler wrote:
> At 1/30/2006 12:50 PM, you wrote:
>
>
>>This one is a bit funny..
>>
>>As part of the big project this weekend, I had this UHF amp with
>>output on a pigtail with a BNC male on the end. I needed to connect
>>with the UHF cans about 6 inches and 180 degrees of bend away, but
>>didn't have the bits to make that cable, so I used some adaptors...
>>
>>Working backwards from the can:
>>N male to PL female.
>>PL male PL Male.
>
>
>>PL right angle.
>
>
> Bzzzzt! Bad adapter #1.
>
>
>>PL female to N male.
>>N female to PL male.
>
>
>>PL Right angle.
>
>
> Bzzzzt! Bad adapter #2.
>
> Can you tell that I've never found a right-angle "UHF" adapter that didn't
> show significant mismatch all by itself?
>
>
>>PL Female to BNC male.
>>BNC female to BNC Female.
>>
>>What seems like pointless conversions in this chain were needed to
>>clear the body of the cans.
>>
>>When testing at full power, this conglomeration of nightmares
>>actually gets warm. The total loss through them is about 1dB though,
>
>
> Probably mostly in the right-angle UHFs.
>
>
>>which brings us back to the question asked last week or so about loss
>>in adaptors.. Looks like roughly 0.2dB
>>
>>So, a rule of thumb emerges: Better to have three feet of good cable,
>>than one good adaptor.
>>
>>
>>Now I've made up a short BNC male to N hardline jumper, and I'm ready
>>to go put that in place, but it will still require a BNC female-
>>female to make the link. I'm thinking of wrapping that BNC junction
>>in copper tape, because I don't think BNCs are all that "Tight".
>
>
> They seem to be good enough for TX-RX (best UHF duplexers IMO), so I
> wouldn't worry about them. Copper tape isn't likely to improve the
> connector shielding unless you get really good conductivity across the
> entire connection (meaning you have to tape the connector body down to the
> mating component - not easy). Try to find silver-plated BNC connectors.
>
> Bob NO6B
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> Yahoo! Groups Links
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