Upon power up switch goes into tx.. saying the tx light comes on.. not sure if it really goes into tx did not hear any relays clicking.. Help?? Skip

Ken,
After I replaced the coax connector ( which did make a difference) I added several Ferrite Mix 31 snap-ons from Palomar Eng. I think all issues were resolved after a few were added but I know all issues are resolved now.
I suspect the reason it was more noticeable after I started using the MFJ-998 is because I get a better tune with the MFJ-998 and can TX at a higher power than before.

73 Mick VA3EPM

Don't know when you posted you problem, But I have a MFJ-986 whish has a similar problem.
I normally work 80 mtrs so have not noticed it on other bands. I run it with a Heathkit Warrior HA10 usually about 500watts.
I noticed it causes my computer to freeze when using a websdr KFS in Half Moon Bay CA. Also my HP Office Jet printer comes alive and starts selecting different menus. With the amplifer not keyed but still passing RF thru the tuner it messes with the printer occationally. With everything staying the same except removing the MFJ-986 tuner and putting my Heathki SA-2040 tuner in place there is no interference. grounding does not change anything with either tuner. Recap... MFJ-986 500 watts interference, Heathkit SA-2040 no interference. I am using ladder line to feed the antenna. Both tuners give same SWR. ?Any suggestions besides connectors?
Thanks, Ken N6BSS

While I have time on my hands, I decided to get around to installing bits I've purchased over the last couple of years. I've hit a snag on the MFJ 1263 radio/microphone switch. I've managed to get it partly working. It works with (Radio A) the Yaesu FTDX101D, Heil Pro 7 head set (Mic 1), and Yaesu M-100 Desk mic (Mic 2).
I can't for the life of me figure out how to get it to work with (Radio B) a Yaesu FT847.
It should be the stock pin set, but it's not?.
I've tried every pin set in the book and found a few others online.
One came close where it keyed up, but the Mic wouldn't work. Another would toggle through memory channels when ptt is pushed.?
I even got through to Jimmy in MFJ, and he's at a loss, too.?
If you have any ideas on the 847 Pin set, please share.?

Do you mean MFJ Enterprises is defunct as for equipment sales, but service on units is still available...

--
Sent from my Android phone with Mail. Please excuse my brevity.

开云体育

Anybody been able to get thru to service?? All I get is a busy signal.

Hi Donald,
Yes, I expect that if I hadn't retighten it the RF would have re-appered. At the time I had hand tightened it and knew it was loose. I figured with pliers and a really good tighten the problem is permanently gone... not the case and I'm glad it failed this way. I've since cut off the connector and replaced it, There now seems to be no RF issues, and the old connector ground was corroded and didn't seem to have a proper ground connection. The Airporne 10 cable is still in the plan but it's waiting for a new beam antenna. I'm thinking of replacing my Alpha delta DXCC dipole with an MA6B mini yagi. not 100% sure that's what I'm going to do yet. I am limited to a roof top antenna and the MA6B is about as big as I can go. I even think a hex beam is more that what would be acceptable.
73 Mick VA3EPM

Mick . . .

On Thu, 04 Apr 2024 11:02:52 -0700, "Mick" <Va3epm@...> wrote:

. . . so I checked that, it was a little loose. After tightening it the problem was gone, So I tightened some more (with pliers) and the problem is back.

Sounds like you found the intermittent fault. I wonder if you hadn't tightened
it some more if you might have thought the problem was a simple tightening
problem and later on had the same problem reappear?

So you'll get to use some of your M&P Airborne 10 now. :-)


Donald KX8K



----------------------------------------------------
Some ham radio groups you may be interested in:
/g/ICOM /g/Ham-Antennas
/g/HamRadioHelp /g/Baofeng
/g/CHIRP

Garry, Jeff,
Again thanks for the feedback.
I decided to start eliminating all possible sources, so I removed the tuner, still an issue (thankfully because I like my 998) then bypassed all accessories (one by one including cables) and directly routed the output of my FT-991a to my antenna (still a problem) but there is a coax coupling in the line (to the antenna) so I checked that, it was a little loose. After tightening it the problem was gone, So I tightened some more (with pliers) and the problem is back.
I do think it is the source, I doesn't look "clean" , I'm going to cut the connector off and replace it until I have time to replace the cable with one that is long enough to not need a coupling. I have a new roll of M&P Airborne 10 calling out "Use Me"?
So I think Jeff you were correct in your assessment. When I finally replace it I'll post again hopefully with my success.
73
Mick VA3EPM

Hi Mick,
Given Gary's experience with the same combo as you and your comment that you didn't experience it with the 962 after you installed "some RF chokes on the lights and oven", it would be my guess that you have one coax cable in your chain that has a poor ground connection.
I experienced a similar problem until I found the offending coax, every connection in the transmission chain is a potential offender. Interestingly enough it physically appeared OK, but obviously was not making a good connection. So you might try swapping out some coax's for better coax's and see.
?Since the Chinese so239/pl259's are so sloppy, I have removed any that I once had from my system, and in fact and switching as much of the connectors over to "N" connectors as I can, this over course means even getting Into some equipment like the tuners and switching the SO239 for a an "N", they are just a better connector.
--
Jeff - NZ2S

I have FTDX101D, MFJ998 combination.
All independently grounded to external earth via a copper busbar.?
I experience no RF in the shack so I doubt it is a design fault in the 998.
GL sorting it
Garry