Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread David Cutter
Wrong use of 75/50 ohm cables is a cause of unreliability on scopes: they're made for 75ohm connectors and if you plug in a 50ohm plug is will eventually splay the centre contact and cause intermittency. David G3UNA Subject: Re: [Elecraft] [K3] [P3] IF Out / IF In Cable Yes, the cable

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Jack Smith
splay the centre contact and cause intermittency. David G3UNA Subject: Re: [Elecraft] [K3] [P3] IF Out / IF In Cable Yes, the cable impedance does not matter but the connectors do. The 75-ohm cable probably has 75-ohm BNC plugs, which as I recall have a smaller pin. They might not make

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Jack Smith
and cause intermittency. David G3UNA Subject: Re: [Elecraft] [K3] [P3] IF Out / IF In Cable Yes, the cable impedance does not matter but the connectors do. The 75-ohm cable probably has 75-ohm BNC plugs, which as I recall have a smaller pin. They might not make reliable connections

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Jack Smith
Sent a correction out 30 minutes ago but have not seen it yet. Too early in the morning to get all the numbers out of my fingers onto the keyboard. Paragraph should read: 50 and 75 ohm N connectors are not mechanically compatible as the center pins are different diameter--50 ohm has larger pin

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread David Moes
Yes there is a difference. But according to Amphenol spec sheet, Two distinct types of 75 Ω BNC's are available, and both mate with each other and with 50 Ω BNC's. the difference is in the dielectric This I doubt will be an issue at IF frequency. This is also backed up in the highly reliable

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Dave Hachadorian
I just bought this one, and it works fine. I wiggled it like crazy, and there's no sign of flakiness: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItemitem=180881244661ssPageName=ADME:L:OU:US:3160 Dave Hachadorian, K6LL Big Bear Lake, California .

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Joel Black
Well, to throw you all out of whack, I used the 93ohm cable. There is no dielectric between the pin and shield. My micrometer will not get in that space very well, but it appears that the diameter is ~1.20mm. I have not noticed any squirrely problems so I'll keep it there for now. Thanks

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Fred Townsend
-Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dave Hachadorian Sent: Monday, September 17, 2012 9:00 AM To: Elecraft Reflector Subject: Re: [Elecraft] [K3] [P3] IF Out / IF In Cable I just bought this one, and it works

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-17 Thread Jim Brown
On 9/17/2012 10:33 AM, Fred Townsend wrote: Personally I don't want a 75 ohm cable in the shack where I might use it on my Ant 3 (K3) connection where it will make a difference. Each to his own. There are times when 75 ohm cable is preferred, regardless of the rated load impedance of the rig

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-16 Thread Alan Bloom
Yes, the cable impedance does not matter but the connectors do. The 75-ohm cable probably has 75-ohm BNC plugs, which as I recall have a smaller pin. They might not make reliable connections with the 50-ohm sockets on the K3 and P3. Go ahead and try it, but if the connections seem flakey you

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-16 Thread Jim Brown
On 9/16/2012 8:11 PM, Alan Bloom wrote: Yes, the cable impedance does not matter but the connectors do. The 75-ohm cable probably has 75-ohm BNC plugs, which as I recall have a smaller pin. They might not make reliable connections with the 50-ohm sockets on the K3 and P3. Go ahead and try

[Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-15 Thread Joel Black
I purchased my P3 second-hand. I have always wondered why the IF Out to IF In cable was so blasted short. I mean, it's only about 12.5 long. With that length, my P3 sits on the left of my K3. That would be the handle side of the K3. I never could understand why that was. Well, I think I

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-15 Thread Don Wilhelm
Joel, You asking for nothing more than the standard cable. I recall (don't have a P3 myself) that the stock Elecraft cable allows the P3 to be positioned on either side of the K3. I would suggest that you either make up your own custom length cable or purchase the replacement part from

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-15 Thread Ron D'Eau Claire
The seller either substituted a different cable or cut the original. The original cable is 36 (92 cm) long. If you want to buy an original cable, order E980170 from parts at elecraft.com. 73, Ron AC7AC -Original Message- Joel, You asking for nothing more than the standard cable. I

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-15 Thread Vic K2VCO
Just try one of the non-50-ohm cables and see if it works. My guess is that it will, but nothing will explode if it doesn't! On 9/15/2012 3:18 PM, Joel Black wrote: I purchased my P3 second-hand. I have always wondered why the IF Out to IF In cable was so blasted short. I mean, it's only

Re: [Elecraft] [K3] [P3] IF Out / IF In Cable

2012-09-15 Thread Jim Brown
On 9/15/2012 5:01 PM, Vic K2VCO wrote: Just try one of the non-50-ohm cables and see if it works Cable impedance absolutely does not matter for such a short run at the IF frequency. 73, Jim K9YC __ Elecraft mailing list Home: