[Collins] Collins Digest, Vol 128, Issue 2

Sat Jan 24 23:45:26 EST 2015

Hi all, 
I got some great answers to my connector question. After some research I located right angled N male to N female adapters which solved the problems. Thanks to all who helped.
73,
Mike

> 
> From: MICHAEL CROGNALE <mcrognale at mac.com>
> To: collins at mailman.qth.net
> Date: January 24, 2015 at 3:59:53 PM CST
> Subject: [Collins] connector questions
> 
> 
> Hi folks,
> 
> I have a few questions about the connectors on my gear. I have: Winged emblem KWM2A , power supply and 30L-1 The 312-4 happens to be round emblem. The 312-4 and 30L-1 have the N connectors of course. I had thought about changing them out to SO239s but decided that would be too much trouble. 
> 
> So the question then becomes; how much loss/resistance can I expect if I use male N/femaleSO239 adapters. I haven’t been using the power meter on the 312-4 for that reason. I am especially concerned about feeding the output of the 30L-1 into the meter assemble using the adapters. 
> 
> Any help or discussion would be appreciated.
> Tnx,
> Mike
> W3LNA/5
> 
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> 
> 
> Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free. 
> Ronald Reagan
> Fight back. 
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> From: "Dr. Gerald N. Johnson" <geraldj at netins.net>
> To: collins at mailman.qth.net
> Date: January 24, 2015 at 5:39:26 PM CST
> Reply-To: geraldj at netins.net
> Subject: Re: [Collins] connector questions
> 
> 
> 
> 
> On 1/24/2015 3:59 PM, MICHAEL CROGNALE wrote:
> 
> Changing the connector on the wattmeter coupler will probably destroy the coupler.
> 
> N connectors aren't as hard to put on coax as PL-259. Just different. There are alternate styles of N connectors that solder to the braid like PL-259. I'd rather do 20 UG21 family type N males than one soldered on PL-259. Lately I've converted to crimped with a ratchet crimper that works for N and UHF.
>> 
> 
> Last night I compared the 2m loss of a length of LMR-400UF with crimp on UHF connectors and a RS UHF female to N male adapter to a length of Belden 8214 with conventional N connectors. The 8214 I've had for decades and its 72 ohm. Compared to the rated output of my 2m rig, I didn't detect any loss with the adapter and UHF connectors (rig has UHF, Bird wattmeter has N). At a KW I'd wish for a silver plated Amphenol adapter rather than a RS adapter. But type N connectors on the coax would be better. RG-8 size rather than 8X or 58.
>> 
>> Any help or discussion would be appreciated. Tnx, Mike W3LNA/5
>> 
>> 
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.
> 
> 
> 
> 
> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> To: collins at mailman.qth.net
> Date: January 24, 2015 at 6:23:08 PM CST
> Subject: Re: [Collins] connector questions
> 
> 
> Why not use the much superior Type N connectors?
> They are not very hard to put on and are constant impedance.
> They do not come loose like SO-239.
> Just a much better connector all the way around.
> 
> 73
> Glenn
> WB4UIV
> ARRL Technical Specialist
> 
> At 04:59 PM 1/24/2015, MICHAEL CROGNALE wrote:
> 
> From: Whitebear1122 <whitebear1122 at comcast.net>
> Cc: collins at mailman.qth.net
> To: MICHAEL CROGNALE <mcrognale at mac.com>
> Date: January 24, 2015 at 7:13:16 PM CST
> Subject: Re: [Collins] connector questions
> 
> 
> Mike, In my personal opinion, you will not notice any loss when using the SO-239 female to male N adapters.  I've had one on my 30L-1 and two on the 312B-4  coupler for 16 years with no problems.   I had them on my 312B-5 when I owned it.   I also have them on the 302C3 wattmeter, again no problems.  While I'm sure there is an actual loss,  it's trivial, you and I will never see it or notice it, and it's only measurable with precision test equipment looking for some 0.1 or 0.2 dB change.    The 30L-1 with an adapter will work with the 312B-4 with adapters just fine.  The adapters are easy and quick.  Changing out connectors is a big hassle with no benefit in my opinion.  
> 
> Enjoy your KWM-2A! station.  I had that station lineup for about 12 years and then sold it a few years ago in a huge radio sell off.   What a fabulous transceiver that was and I sometimes think about buying another one.  I do have the S-Line with the 30L-1 and 302C3 and I love that station!
> 
> 73, Scott WA9WFA
> 
> On Jan 24, 2015, at 3:59 PM, MICHAEL CROGNALE <mcrognale at mac.com> wrote:
> 
>> Hi folks,
>> 
>> I have a few questions about the connectors on my gear. I have: Winged emblem KWM2A , power supply and 30L-1 The 312-4 happens to be round emblem. The 312-4 and 30L-1 have the N connectors of course. I had thought about changing them out to SO239s but decided that would be too much trouble. 
>> 
>> So the question then becomes; how much loss/resistance can I expect if I use male N/femaleSO239 adapters. I haven’t been using the power meter on the 312-4 for that reason. I am especially concerned about feeding the output of the 30L-1 into the meter assemble using the adapters. 
>> 
>> Any help or discussion would be appreciated.
>> Tnx,
>> Mike
>> W3LNA/5
> 
> 
> 
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MICHAEL A CROGNALE
mcrognale at mac.com