[TenTec] HELP! Eagle Tuning Problem

Kim Elmore cw_de_n5op at sbcglobal.net
Wed Jan 1 15:54:14 EST 2020

Within all the useful advice has (mostly) been an assumption the problem must be in the tuner. I’m skeptical of that. I suspect it’s something to do with a connection to the antenna, a connector, or as others have said, a jumper. I think you said the antenna SWR is 2.6:1 so there may be a current loop somewhere that gets hot enough to cause connection problems. 

As a quick test: when the tuner wigs out, quickly switch to a dummy load. If you get a match with no odd behavior, it’s not the tuner. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Jan 1, 2020, at 11:13 AM, 1291jim at gmail.com wrote:
> Happy New Year All,
> I have had an issue with my Eagle happen twice now.
> Issue:
> -  Eagle loses tuning and SWR starts going crazy and jumping all over the
> place
> -  Will not tune with inboard or outboard tuner
> -  Returns to normal operation after I shut in down for a while
> Background:
> - Has only happened when I have been operating for several hours and during
> a 20 min+ QSO, (so lots of sending) and both times on 40M
> - Eagle felt warm but not hot
> - Antenna is an EndFed (Alpha Antenna J-Pole Sr)
> - Without tuning on 40M SWR is 2.6 : 1 
> - Normally tunes to 1.0 or 1.1 : 1 with outboard or internal tuner
> 1st occurrence:
> - I had been operating for 3-4 hrs
> - Eagle was running 100W through an MFJ Intellituner Model 993B that tuned
> SWR to 1.1 : 1
> - SWR started jumping all over the place
> - MFJ could not tune it
> - I assumed it was the MFJ Tuner, shut it all down. 
> 2nd occurrence: (last night)
> - Had been operating several hours at 100W
> - Eagle again through MFJ Tuner when SWR started jumping all over
> - This time I bypassed the MFJ tuner and tried to tune with the Eagles
> internal tuner
> - The internal tuner could not tune the antenna and SWR continued going nuts
> through the attempted tuning process
> This morning after a rest, rig tunes FB with outboard or inboard tuner.
> Pulling it from service now.
> Any advice would be appreciated.
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec

More information about the TenTec mailing list