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Author Topic: ALS600 tuning question - doesn't like 17M?  (Read 683 times)
KD0ZGW
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Posts: 716




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« on: November 04, 2017, 07:54:34 AM »

TS0590s and ALS600.  Palstar AT1500DT tuner

Cushscraft XM240 "shorty forty" beam.

I've been using this set-up for a while without any problems.

40M beam has always tuned up nicely on 17M.  Today the amp will fault out immediately even at relatively low output and tuner showing 1:1 SWR.

TS-590 tuner tunes up the antenna on 17M at 1:1 no trouble and signal reports barefoot are good.

We just had our 1st snowfall of the year which maybe is related.  The antenna was serviced recently so maybe water in a coax coupling (although all were well sealed) but why only 17M?

Problem does not occur tuning up the beam on other bands.  what would make the amp fault out under these conditions?

Thx in advance for advice.

KD0ZGW
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AC2RY
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Posts: 282




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« Reply #1 on: November 04, 2017, 08:08:06 AM »

TS0590s and ALS600.  Palstar AT1500DT tuner

Cushscraft XM240 "shorty forty" beam.

I've been using this set-up for a while without any problems.

40M beam has always tuned up nicely on 17M.  Today the amp will fault out immediately even at relatively low output and tuner showing 1:1 SWR.

TS-590 tuner tunes up the antenna on 17M at 1:1 no trouble and signal reports barefoot are good.

We just had our 1st snowfall of the year which maybe is related.  The antenna was serviced recently so maybe water in a coax coupling (although all were well sealed) but why only 17M?

Problem does not occur tuning up the beam on other bands.  what would make the amp fault out under these conditions?

Thx in advance for advice.

KD0ZGW


Start with checking amplifier running on dummy load. That way you will exclude amplifier part, if it does not fault. Water/ice can indeed cause arc somewhere (and faults under high power usually results from arc). Considering that RF voltage in antenna elements differs from band to band, it is possible that it causes arc only on one or few bands.
 
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KD0ZGW
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Posts: 716




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« Reply #2 on: November 04, 2017, 09:05:34 AM »

Alex;
Your comment gives good reasons for problem characteristics.

thanks.

Mark in MN
KD0ZGW
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N4KZ
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Posts: 698




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« Reply #3 on: November 04, 2017, 03:12:44 PM »

My ALS-600 works fine on 17m. It's likely the snow isn't your friend.
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K6AER
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Posts: 4671




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« Reply #4 on: November 05, 2017, 06:02:17 AM »

VSWR s 1:1 at the tuner but what is it at the amplifier?
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N4ATS
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Posts: 1192




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« Reply #5 on: November 06, 2017, 05:45:37 AM »

What does the amplifier do with a dummy load installed at the output connector of the ALS600?

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