Hi Steve,
I've reset the ts590 and tried changing the antenna from a to b and no go.
After I sent a posting to the 590 list, I got an email from a guy who had
the 901 fuse go on his rig and he said that the symptom of everything
working on the receiver except it sounded like there was no antenna
connected was the same as his. In searching for symptoms of the 901 fuse
blowing, all I found is that you would lose receive audio, and that is not
what happens. The audio is fine, there are just no signals coming from the
antenna, not even any birdies. Good thing that I have backup rigs.
Bob, K8LR, [log in to unmask]
-----Original Message-----
From: Steve Forst
Sent: Wednesday, July 02, 2014 8:33 PM
To: [log in to unmask]
Subject: Re: Kenwood TS-590 ALC mod
Bob,
I saw your post on the 590 list. Are you sure the fuse has failed?
Have you tried a full reset? Maybe set to the wrong antenna, or drive
function enabled, or rx only antenna activated. Maybe none of the
above, but it's worth poking around a bit and doing a reset if need be.
Nothing else to lose.
73, Steve KW3A
On 7/2/2014 6:27 PM, Bob, K8LR wrote:
> Hi,
>
> I have to send my TS590 back to Kenwood as a power failure here finally
> blew that f-901 fuse.
>
> I wasn't going to have the ALC mod done as I have never had trouble with
> either my ALS600 or my ALS1300 amps while using the TS590. After reading
> Steve's great explanation of the ALC mod, I'm going to have it done while
> Kenwood East is replacing the fuse. I wonder how powerful the magnifying
> glass has to be to work on that little surface mount fuse?
>
> Bob, K8LR, [log in to unmask]
>
> -----Original Message-----
> From: Dr. Ronald E. Milliman
> Sent: Wednesday, July 02, 2014 6:10 PM
> To: [log in to unmask]
> Subject: Re: Kenwood TS-590 ALC mod
>
> Steve, thanks for the heads-up re the TS-590 mod. I purchased mine new
> last
> November; so, evidently, if I operate my ALS-600 with it, I really should
> have the mod installed.
>
> Ron, K8HSY
>
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Steve Forst
> Sent: Wednesday, July 02, 2014 1:10 PM
> To: [log in to unmask]
> Subject: Kenwood TS-590 ALC mod
>
> Not sure if anyone else on the list has had this done, but figured I
> would share my experience.
>
> First, don't take anything I say as Gospel, confirm with another source.
>
> The 590 has had a known issue of ALC/power spike and Kenwood is now
> offering a free mod to fix. You need to send the radio to a Kenwood
> service center at your expense, and Kenwood covers the mod and return
> shipping.
>
> If this spike exists on a particular radio, it could cause a solid state
> amp
> (or some high end tube amps) to trip their protection circuit.
> Many solid state amp owners have reported no problems and all works
> well. others, like me, found the amp tripped with only modest drive.
>
> in my case my THP 1.2kfx which should put out 750 watts pep, with a
> drive between 75-90 watts, would trip off with much less. On 10
> meters I was limited to about 35 watts drive, 40 watts on 15, and 50 or
> so on 20 meters. Lower bands could handle 60 watts. More drive and
> the amp would trip.
>
> Sent mine out in June to the Virginia Beach service center and had it
> back in 12 days. Have had it back for a week and have run it with the
> ss amp and no problems. Played some in the Canada Day contest on both
> 15 and 20 meters running 70 watts drive and no problems. THP is out of
> business now and this amp would be expensive to repair, so I will probably
> limit drive to 65-70 watts and hopefully the extra headroom will give it
> a
> longer life. I'll treat it like a 550 - 600 watt amp instead of 750.
>
> So I was happy with the result. Your mileage may vary. The mod
> consists of some hardware changes and some changes in the alignment
> procedure. If your 590 was built starting in January 2014, the changes
> were implemented at the factory. Anything built from 2010 - 2013 can
> get the mod if you desire. Obviously most of these radios are long
> out of warranty, but kenwood is treating this as a warranty repair.
> Mine was built in April 2011 and purchased in June 2011.
>
> Anyway, that's my long winded story.
>
> 73, Steve KW3A
>
>
>
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