Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?
No, as long as the cable is well shielded and the connectors fit well. Larry N8LP On 1/16/2016 4:06 PM, elecraft-requ...@mailman.qth.net wrote: Date: Fri, 15 Jan 2016 20:15:32 -0500 From: Bert Rollen To: Subject: [Elecraft] 75 ohm cable on Buffered I.F. Output? Message-ID: Content-Type: text/plain; charset="us-ascii" All, I am setting up a LP-PAN with my K3. Will I cause much problem by using a 75 ohm jumper on the IF ? (I happen to have several fairly nice 24" Belden 8263 BNC jumpers on hand). Thanks, Bert __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?
On 01/16/2016 09:51 AM, Bert Rollen wrote: ... With renewed inspiration, I have dug several options out of my junk-box, including some 6" & some 24" heliax jumpers. They are N-type, but I can adapt. Male N connectors fit perfectly into female BNCs. (Try it!) The only downside is there is no positive retention, so you don't want to use this method if there is a chance the cable will get tugged on. Alan N1AL __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?
Thanks all for the replies. With renewed inspiration, I have dug several options out of my junk-box, including some 6" & some 24" heliax jumpers. They are N-type, but I can adapt. I also found a 8" LMR-400 jumper with BNCs on it, and a few other jumpers. (I have wy to much crap around here) 73, Bert BTW, the K3 is a 1500+ serial no. , but has been fully updated at the factory a few months back. Only thing I am missing is the KIO3B and the 4-layer main-board (and have no intent to upgrade those). -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Jensen Sent: Friday, January 15, 2016 8:35 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 75 ohm cable on Buffered I.F. Output? No. What will matter is the quality of the connectors. The 1st IF output from the K3 is low level, the P3 is basically a fairly sensitive HF receiver, and bad connectors can create all sorts of problems. You didn't give a S/N range for your K3, but there is a simple mod [destroy one surface mount resistor and replace it with a non-SMC resistor] that will raise the IF output. 73, Fred K6DGW - Northern California Contest Club - CU in the Cal QSO Party 1-2 Oct 2016 - www.cqp.org On 1/15/2016 5:15 PM, Bert Rollen wrote: > I am setting up a LP-PAN with my K3. > Will I cause much problem by using a 75 ohm jumper on the IF ? (I > happen to have several fairly nice 24" Belden 8263 BNC jumpers on hand). __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?
No. What will matter is the quality of the connectors. The 1st IF output from the K3 is low level, the P3 is basically a fairly sensitive HF receiver, and bad connectors can create all sorts of problems. You didn't give a S/N range for your K3, but there is a simple mod [destroy one surface mount resistor and replace it with a non-SMC resistor] that will raise the IF output. 73, Fred K6DGW - Northern California Contest Club - CU in the Cal QSO Party 1-2 Oct 2016 - www.cqp.org On 1/15/2016 5:15 PM, Bert Rollen wrote: I am setting up a LP-PAN with my K3. Will I cause much problem by using a 75 ohm jumper on the IF ? (I happen to have several fairly nice 24" Belden 8263 BNC jumpers on hand). __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] 75 ohm cable on Buffered I.F. Output?
For that short distance, it will not matter if you use 50 ohm of 75 ohm coax. 73, Don W3FPR On 1/15/2016 8:15 PM, Bert Rollen wrote: I am setting up a LP-PAN with my K3. Will I cause much problem by using a 75 ohm jumper on the IF ? (I happen to have several fairly nice 24" Belden 8263 BNC jumpers on hand). __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
