John another approach might be to UN-plug as much stuff as you can from the radio, and see if the problem goes away....my experience with ferrites has been 'get the big ones'.. so you can put more than one turn through them. remember ' N squared ' ??...and, like others, have found 31 mix really is magic...
another 'reference' article: http://www.ifwtech.co.uk/g3sek/in-prac/index.htm#1005 in addition to K9YC's excellent articles...and others... then again, if the problem is just on 20m, have you tried making the antenna feedline another quarter wavelength longer, on say 14.150 ? 73, good luck, w5xz, dan --- On Mon, 9/12/11, William H. Fite <[email protected]> wrote: From: William H. Fite <[email protected]> Subject: Re: [Flexradio] Flex 3K and 5K software shut down QRO. To: "Neal Campbell" <[email protected]> Cc: [email protected] Date: Monday, September 12, 2011, 2:56 PM I, like the others who've checked in here, have put ferrites on every single cable in the shack. It seems like overkill but I've had absolutely no issues with RF since doing so. Also, of course, be sure that your station ground is really good, ground wires or straps are as short as possible, and all that stuff that you doubtless have done already. Good luck. You'll find the entry point sooner or late. Hopefully sooner. Bill On Mon, Sep 12, 2011 at 9:41 AM, Neal Campbell <[email protected]>wrote: > You might try an isolator from RFWorks between the antenna and your shack. > That or an UNUN/BALUN depending on your antenna situation. > > BTW, what are your antennas? > > 73 > Neal > > On Mon, Sep 12, 2011 at 8:54 AM, W1JCW <[email protected]> wrote: > > > No luck adding the ground or the two chokes on each end of the fire ware > > cable. > > > > It seems just 20m even when I don't use my Acom 2k. If I turn the drive > up > > to 75w > > the audio cuts in and out and I can hear the relays in the 5K. > > > > All other bands qro are fine, no issue. > > > > Must be some harmonic on 20m getting into the box or feeding back into > it. > > > > Suggestions ?? > > > > 73- > > W1JCW > > John > > > > > > From: W1JCW > > Sent: Friday, September 09, 2011 8:44 AM > > To: Ray, K9DUR > > Subject: Flex 3K and 5K software shut down QRO. > > > > > > I don't have a ground on the PC so I'll add that tonight and see how it > > works. > > > > I did have a choke on each end of the fw cable but that didn't work but I > > had no ground then. > > I'll put a choke on each end of the fw if adding the ground on the PC > > doesn't work. > > > > Stay tuned. > > > > Thanks for the replies. > > > > 73- > > W1JCW > > John > > > > > > From: Ray, K9DUR > > Sent: Thursday, September 08, 2011 8:11 PM > > To: [email protected] ; [email protected] > > Subject: Re: [Flexradio] Current Flex 3000 software shuts down when > > runninghigh power. > > > > > > Frank, > > > > That definitely sounds like RF feedback. The most likely culprit is the > > firewire cable. I had the same issue running my amp with my FLEX-5000A. > > > > First, make certain that your PC is connected to the shack ground. After > > all, it is better than half of the radio. > > > > If you are using the stock firewire cable that came with the rig, replace > > it > > with the one by Granite Digital. Is costs about $40 & is availabel from > > Flex. > > > > Finally, if you still are having problems, add ferrite chokes at each end > > of > > the firewire cable. > > > > The above steps eliminated my RF feedback problems entirely. Now I can > run > > 1kW on all bands with no issues. > > > > 73, Ray, K9DUR > > http://k9dur.info > > _______________________________________________ > > FlexRadio Systems Mailing List > > [email protected] > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > Knowledge Base: http://kc.flexradio.com/ Homepage: > > http://www.flexradio.com/ > > > > > > -- > Abroham Neal Software > www.abrohamnealsoftware.com > Work:(540) 645 5394 > Mobile:(540) 645 8171 > _______________________________________________ > FlexRadio Systems Mailing List > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
