Re: [Elecraft] can rf interference get into a k2?
Wow. Perhaps we can get a bit more helpful. Pretty much every wire going into or coming out of the K2 presents a very good possibility for RFI intrusion. This is true for any rig. The low-level microphone signals are a very good place for this to occur - for me it seems that having a regular microphone attached things work OK, but connect it to a sound interface box and you are asking for problems. The serial port KIO2 or KPA100's port has quite a few of these opportunities. Even the power cord could be a conduit for RF. My own station suffers from RFI on 40 meters, where I have an antenna running just 20 feet over the K2/100. Through various methods of shielding, the use of ferrite cores and other methods, I have reduced this problem quite a bit. But I have yet to eliminate it (It's sort of become a crusade...). There is a lot of information available discussing the subject. Jim Brown, K9YC, has an excellent collection of RFI information that I currently believe to be the best available on the web. There is a lot of information at his site, some directly discussing ham rigs, most discussing RFI in audio systems. See: http://audiosystemsgroup.com/publish One of the things Jim advocates is the use of twisted pair to carry signals in and out of the K2. By doing this, the signals essentially become carried in a differential mode of operation, where the interference tends to cancel itself out. I can't say this is the ultimate solution, but it is the direction I am taking my own station. Good luck tracing down the problems. Some folks are really lucky, while others have a great learning opportunity for dealing with EMI and RFI. learning new things is what it's all about, right? On Feb 2, 2006, at 5:59 AM, [EMAIL PROTECTED] wrote: I'm having problems with rf interference when attempting to transmit. I have a list of possibilities which don't need exposure here, but I do want to know if the K2 with the rear cover it comes with with all of the unfilled openings can allow rf into a place where it could be a problem? Should I block the holes? I would be delighted to find out this isn't a possibility in any case, 73, John Ferguson KI4NGH ___ -Jack Brindle, W6FB === ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] can rf interference get into a k2?
Is this rf interference (rf feedback ?) on SSB, CW or both ? 73 Stewart G3RXQ On Thu, 02 Feb 2006 08:59:54 -0500, [EMAIL PROTECTED] wrote: > I'm having problems with rf interference when attempting to transmit. > > I have a list of possibilities which don't need exposure here, but I do > want to know if the K2 with the rear cover it comes with with all of > the unfilled openings can allow rf into a place where it could be a > problem? > > Should I block the holes? > > I would be delighted to find out this isn't a possibility in any case, > > 73, John Ferguson KI4NGH > ___ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] can rf interference get into a k2?
I doubt it's the cover holes. I've done some testing with the top and bottom covers off while interfacing my newly built K2 to a 1500W amplifier without any problems. (QRP is fun, but sometimes...) Is your problem band sensitive? Is your antenna resonant? I would suspect grounding problems. Good luck! 73, Bill N2BC [EMAIL PROTECTED] wrote: I'm having problems with rf interference when attempting to transmit. I have a list of possibilities which don't need exposure here, but I do want to know if the K2 with the rear cover it comes with with all of the unfilled openings can allow rf into a place where it could be a problem? Should I block the holes? I would be delighted to find out this isn't a possibility in any case, 73, John Ferguson KI4NGH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] can rf interference get into a k2?
A good starting point would be to operate into a dummy load. If there's no interference, then you're dealing with energy radiating from the antenna - not a K2 problem. If there is interference, that narrows the possibilities to the K2, the dummy load, the coax, and ... the power supply. Hope this helps. ed - k9ew On 2/2/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > I'm having problems with rf interference when attempting to transmit. > I have a list of possibilities which don't need exposure here, but I do > want to know if the K2 with the rear cover it comes with with all of > the unfilled openings can allow rf into a place where it could be a > problem? > > Should I block the holes? > > I would be delighted to find out this isn't a possibility in any case, > > 73, John Ferguson KI4NGH > ___ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] can rf interference get into a k2?
John: It is very highly unlikely that the holes are a problem. I think you can discount that one. It would help to know what sort of RFI you are experiencing and what your antenna arrangement is (everything between the K2 and the ether and a description of the nature of and proximity to surrounding objects). best wishes, dave belsley, w1euy On Feb 2, 2006, at 8:59 AM, [EMAIL PROTECTED] wrote: I'm having problems with rf interference when attempting to transmit. I have a list of possibilities which don't need exposure here, but I do want to know if the K2 with the rear cover it comes with with all of the unfilled openings can allow rf into a place where it could be a problem? Should I block the holes? I would be delighted to find out this isn't a possibility in any case, 73, John Ferguson KI4NGH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] can rf interference get into a k2?
John, I have never heard of a problem that required covering the holes, but then I have not run any tests of RF leakage either. I would suggest that you first examine the integtity of the contact with the case at the 2D connector locations - be cetain all the masking has been removed and there is no paint at those locations. 73, Don W3FPR > -Original Message- > > I'm having problems with rf interference when attempting to transmit. > I have a list of possibilities which don't need exposure here, but I do > want to know if the K2 with the rear cover it comes with with all of > the unfilled openings can allow rf into a place where it could be a > problem? > > Should I block the holes? > > I would be delighted to find out this isn't a possibility in any case, > > 73, John Ferguson KI4NGH > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] can rf interference get into a k2?
I'm having problems with rf interference when attempting to transmit. I have a list of possibilities which don't need exposure here, but I do want to know if the K2 with the rear cover it comes with with all of the unfilled openings can allow rf into a place where it could be a problem? Should I block the holes? I would be delighted to find out this isn't a possibility in any case, 73, John Ferguson KI4NGH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
