Hey, Mike, long time no yak. How ya doin?
"N" connectors are great at 900 MHz. If you're really concerned, you
can buy the fancy stainless steel precision ones that cost a bunch
more than the chromed brass ones. Make sure you install them
strictly according to the manufacturer's instructions.
The crimp types are OK, but the special crimping tool price tag
might short circuit your pacemaker!!
Do you recall what was the frequency on the MSF5000 repeater
when you sent it to me? At long last I'm finally getting around to
putting it up and running with autopatch.
TNX & 73,
Dick W1NMZ
----- Original Message -----
From: "Mike Pugh" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: 30 January, 2006 14:51
Subject: Re: [Repeater-Builder] Loss through adaptors:
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
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
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