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Auto-tuner issue
Topic Started: Wednesday, 29. November 2017, 21:04 (378 Views)
Nik Gnashers
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26 Charlie Tango 573

Just wanted to share my experience tonight, and hear any opinions or comments.

So, usually my set up is FT450D, running to and LDG AT100 proII auto-tuner, with an OCFD in ant1 socket, and an imax2000 in ant2 socket.

After putting a new top & middle section on the imax last week, and taking up the sag in the wire dipole, swr readings were better than ever.
The wire was 1:2 to 1:5 across the whole of 40m, and 1:4 to 1:7 across the whole of 20m.
On 17 it needed the tuner to get it in, and it 'just' about tuned on 80 but took ages and obviously struggled so I never used 80.
I used the imax on 10/12, where it would just about work on 24.990 but even 20k down it needed the tuner. On 10m it was fine up to about 28.600 then needed the tuner. It was 1:3 on 15m where it used to be flat.

So tonight, I put the radio on 40 and noticed the tuner clicking away, unusual as it shouldnt need to tune there. In fact, it would not tune in at all ?
Same on 20. so tried the other antenna, and it was ok on 10m 28.200 at 1:5 .... higher than it should be, as it used to be 1:2 there.
I unplugged the power to the tuner, as I was going to replug power to reset it see if it made any difference, and a bit spark shot from the 12v plug to the socket on the back of the tuner.
The PSU went very dim, and the radio was dead !!
I unplugged the power leads from the PSU and checked the fuse in the back, all ok.
I thought best not plug the tuner back in, just in case, and instead, I put an antenna switch and normal swr meter in line, in place of the tuner.
PSU powered up as normal (phew), radio powered up as normal (BIG PHEW), and I started checking the swr.
40m flat, almost the whole band, 1:1.1 at worst.
20m 1:1.1 rising to 1:1.3 at worst.
switched to imax, 10m flat to 28.400 then started to rise to 1:1.7 at 28.800 so better than usual.
15m flat almost the whole band, rising to 1:1.2 at worst.
So, I can't get on 12, or 17, but swr seems better without the autotuner in line on the bands I can get on.
So, what do you think ?
Autotuner swr readings were higher than reality ?
My 70 SWR meter reading low (although it reads the same on two other cheap meters I tried previously) ?
Bit confused but a few shouts and I seem to be working fine, so think I might ditch any tuner and just use the antenna switch to flick between the antenna's and stick to 40/20/15/12/10 !
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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vendee85
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26 Charlie Tango 2201

Hi. Nik.

I'm going to Nevada next week to buy a load of PMR/HF gear. On my list is MFJ tuner for 1.8/30mhz you
cant beat the old fashioned Manual 3knob TX/IND/ANT tuner. I hate modern auto/digi equipment. I suggest
you take the ATT to Knight's to check out before you use it again. 73s Mike


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Nik Gnashers
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26 Charlie Tango 573

Opened it up, can't see anything wrong ?

[imgw=600]https://i.imgur.com/n7jvCSu.jpg[/imgw]

[imgw=600]https://i.imgur.com/p7LCReV.jpg[/imgw]

[imgw=600]https://i.imgur.com/yDMGriS.jpg[/imgw]

[imgw=600]https://i.imgur.com/KehxLwu.jpg[/imgw]

[imgw=600]https://i.imgur.com/46Er9Ve.jpg[/imgw]

[imgw=600]https://i.imgur.com/CFd3WDB.jpg[/imgw]

[imgw=600]https://i.imgur.com/c6gk6T4.jpg[/imgw]

[imgw=600]https://i.imgur.com/BmDmp1l.jpg[/imgw]
Edited by Nik Gnashers, Thursday, 30. November 2017, 17:54.
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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razor36
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i bought a ldg 11pro this year i quite like it but i do miss my old manual tuner.
M0LSG
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vendee85
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26 Charlie Tango 2201

Hi. Nik.

Just seen the photo's. nothing seems to be amiss, How skilled are you with a sensitive V./Micro amp meter
or Oscilloscope & check V & As if you now the values or have a circuit diagram. You may need to check the
continuity of those Soldered joints, 1 may have o.c.. Don't mess with any voltage as there are some sensitive
Resistors & Caps in there. 73s Mike.


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ur5by9
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108 Charlie Tango 188

I have an SGC-230 which remembers tuned frequencies so doesn't have to re-tune unless it notices a difference in swr.
You can trick it to re-tune by quickly jumping between 20 + 40m with key down

I know that's not much help, Hope you get top the bottom of the issue.
If at first you don't succeed, skydiving is not for you
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vendee85
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26 Charlie Tango 2201

Hi Nik.

Just checking your pics. again. the 1st pic. The choke L3 isn't inline like the rest check this out. 73s Mike.


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Nik Gnashers
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26 Charlie Tango 573

Thanks chaps for the replies.

The tuner was only used on 12m & 17m this is why I am confused. It was operating in BYPASS mode on 20 and 40 because the swr on my wire is v good on both 20 & 40.
Tonight, before the spark happened, it would not run in bypass mode on 20 or 40, and in fact, would not even tune the wire on either of those bands. The relays just clicked forever.
That is why I thought I would unplug power and reset it.
Without the tuner in line, the normal swr meter shows a very good almost flat swr on 40m and nearly as good on 20m so the antenna is perfect.
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[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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Nik Gnashers
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26 Charlie Tango 573

vendee85
Wednesday, 29. November 2017, 22:26
Hi Nik.

Just checking your pics. again. the 1st pic. The choke L3 isn't inline like the rest check this out. 73s Mike.
The choke is fine m8, it's held in place with glue like the others, nothing amiss.
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All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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Nik Gnashers
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26 Charlie Tango 573

Today I have been operating with just the radio, plugged into the swr meter, plugged into the antenna switch.

On 20m the swr on 14.115 was the highest reading (ie it drops lower, the further I tune towards 14.350).
The swr meter (a cross needle MAAS) showed it to be 1:2.2, yet on my radio's display, swr displayed as 1:1.7.
I expect a little difference, but I suspected this was more than it should be, and to be honest, I truest the Yaesu built in display more than the MAAS swr meter.
So, I thought I would try removing the MAAS swr meter from the set up.
On the same frequency, 14.115, the Yaesu display now shows 1:1.6 ......
It seems less is more (forward power anyway lol).
I am beginning to think, that even if the insertion loss is minimal, I am still better off with nothing in line, apart from a switch to change antenna's (a Diawa CS-01 quality switch).
Less clutter too, and if I do have any antenna issues and the swr is higher than normal, the radio does have a built-in protection to cut the tx power should something be amiss, so I should be ok running things like this I think ?
So, would you trust the radio's built in swr reading, or the external meter ???

OK, I still use a Behringer Ultravoice mic, Behringer audio mixer, and PTT button, but that is simply because of the limited mic EQ options available on the radio menu. This way it allows me to tailor the bass/mid/treble/ to suit my voice.

[imgw=500]https://i.imgur.com/a86RB5U.jpg[/imgw]
Edited by Nik Gnashers, Thursday, 30. November 2017, 17:53.
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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vendee85
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26 Charlie Tango 2201

Hi. Nik.

Nice to see your using decent co-ax to your Ant. switch. I'm going to buy SSB 15 @ Nevada next week. only
6db loss over 10m. @ 440mhz. Can I suggest you try & take the Bellringer out of the equation, is it mains
powered? or move it to the other side of the 450. I'm in favour of the less you have inline the better, so long
as the Ant. is tuned. There might be some Mains RF getting into Mic' leads or Ant. co-ax were the Bellringer is.

Hope this help's 73s Mike.



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Nik Gnashers
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26 Charlie Tango 573

Hi Mike,
It is a coincidence you mentioned the audiio mixer, because today I had a qso with my friend who lives very close to me, and he heard some RF being picked up and transmitted.
I moved the mixer away from the radio but although slightly better it was still there.
So, I have now removed the mixer, and studio mic lol, and am using the stock mic, which almost completely cured any RF except for some very tiny amounts only coming through on 20. So, I have ordered some more ferrites, which will be clipped on everything, and hopefully cure the remaining small issue.
The stock mic works ok, sounds ok, so as long as I am being heard and getting contacts, that's all I wish for :)

Coax is Ecoflex10 for the wire, and Westflex for the vertical.
Edited by Nik Gnashers, Thursday, 30. November 2017, 17:56.
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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S4b0t3ur
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26 Charlie Tango 985

Hi,

I had a similar issue with an LDG AT1000 pro. It turned out to be a PSU over voltage issue. MadMark1 fixed the PSU and all is well.
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Nik Gnashers
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26 Charlie Tango 573

S4b0t3ur
Thursday, 30. November 2017, 16:01
Hi,

I had a similar issue with an LDG AT1000 pro. It turned out to be a PSU over voltage issue. MadMark1 fixed the PSU and all is well.
Oh, that is interesting, many thanks for the information !
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[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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