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RE: Source for F to N/SO239 Adapters




RG58 and 9913 are 50 ohm. Where as RG59 & RG6 are 75 ohm.



At 10:22 AM 02/26/2001 -0600, Diggs, Steve wrote:
>Good point, Mike. Didn't think about the impedance match aspect. Since both
>RG58 and RG6 are both 75 ohm also, whereas 9913 is 50 ohm, wonder what the
>net-net effect is in each case. 
> 
>As a test this morning, I stretched out 150 feet of 9913 and 150 feet of R6G
>I had surplus, and then respectively hooked a dummy load on one, then the
>other. Each was hooked to the 736 when the dummy load was attached. The RG6
>was WAY noiser than the 9913. 
> 
>Maybe what my experience is showing relates to a noisy urban environment and
>noise rejection as much as anything else.
> 
>SD
>
>-----Original Message-----
>From: Mike Murphree [mailto:n4cnw@knology.net]
>Sent: 2/26/2001 10:16 AM
>To: Jon Ogden; Douglas Cole; w4epi@mediaone.net
>Cc: k6ccc@AMSAT.Org; amsat-bb@AMSAT.Org
>Subject: Re: [amsat-bb] Source for F to N/SO239 Adapters
>
>
>
>I think you are missing the point that the Drake converter was
>*designed* for 75 ohms to start with.  A 50 ohm connector will
>*create* a mismatch, but of course you will have that when you
>connect to a 50 ohm receiver anyway.  The converter has more
>gain than you can possibly use.  The F connector should be
>waterproof if applied properly and RG-6 is cheap and available 
>in double shielded varieties if needed for isolation. There doesn't
>seem to be much advantage in changing the connector or the
>cable.
>
>73 Mike N4CNW
>
>On Monday 26 February 2001 06:43 am, Jon Ogden wrote:
>> on 2/25/01 11:30 PM, Douglas Cole at n7bfs@qwest.net wrote:
>> > So , what did I do for the IF output of the Drake ?  , well considering
>> > we are not all that worried about loss ( should be more than enough to
>> > drive a sensitive 2 meter rx input ) I removed the F connector and
>> > installed a bnc panel
>> > mount female that I had in my parts supply , worked out fine and is nice
>> > for quick disconnect .....
>>
>> To me, that's a much better solution than an F connector.  Considering the
>> F connector is 75 Ohms, you have an impedance mismatch right there.  And a
>> BNC connector is going to have far less loss than an F connector (a BNC
>and
>> an N have the same internal construction (center pin, dielectric width,
>> etc). It's just the outer connector that's different.
>>
>> You and I were thinking the same thing!
>>
>> 73,
>>
>> Jon
>> NA9D
>>
>> -------------------------------------
>> Jon Ogden
>> NA9D (ex: KE9NA)
>>
>> Member:  ARRL, AMSAT, DXCC, NRA
>>
>> http://www.qsl.net/ke9na
>>
>> "A life lived in fear is a life half lived."
>>
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>
Reid Bristor
Bristor Associates
URL:	www.bristor-assoc.com
Phone:	(321) 254-1265
FAX:	(321) 253-1162

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