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Author Topic: Ant Tuner ??  (Read 1206 times)
N0TJO
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Posts: 23




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« on: March 22, 2013, 08:44:23 AM »

I am using the Hustler 4BT Vertical antenna. Its ground mounted and according to my SWR meter (w/o tuner in line) it is <1.5:1. As a test with a new rig (450D) I hit the antenna tuner button and it wouldn't tune...just kept rattling. I switched out the rig with my backup FT 890AT and it did the same. Why will neither rig find a tuned spot with the antenna tuner when without the tuner its almost 1:1 already?? is there an actual problem or is it normal?

Any feedback appreciated. Brian/W4ZGH
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WB6BYU
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Posts: 13479




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« Reply #1 on: March 22, 2013, 08:47:30 AM »

Do the rigs have built-in SWR meters?  If so, what to they read?

I would expect either rig to be able to match the antenna.  Since
neither does, I'd first suspect that, while your SWR meter shows
a low SWR, the rig is not.  That leads me to suspect the jumper
cable between the SWR meter and the rig - perhaps a poor
shield connection?

As a test, can you unplug the coax from the SWR meter and
connect it directly to the radio?
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N0TJO
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Posts: 23




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« Reply #2 on: March 22, 2013, 09:33:34 AM »

Im using an internal SWR meter on both rigs. Both meters show <1.5:1 swr w/o tuner. Niether rigs tuner will "tune" the antenna...switches rattle but wont tune.
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K2DC
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« Reply #3 on: March 22, 2013, 12:48:11 PM »

I have seen other inboard auto-tuners that are not happy trying to match a low VSWR to a better VSWR.  It shouldn't be a concern if the VSWR is already <1.5:1.  Just leave the tuner turned off and let the rig do it's thing.  You can't hurt anything, and the mismatch losses are minimal.

73,

Don, K2DC
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WB2WIK
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Posts: 20636




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« Reply #4 on: March 22, 2013, 03:11:13 PM »

I have seen other inboard auto-tuners that are not happy trying to match a low VSWR to a better VSWR.  It shouldn't be a concern if the VSWR is already <1.5:1.  Just leave the tuner turned off and let the rig do it's thing.  You can't hurt anything, and the mismatch losses are minimal.

73,

Don, K2DC


Ditto.  I've seen this effect also.  Seems the algorithms (code) in the controllers aren't always equipped to deal with an already-low SWR.  Just turn the tuner off and use the rig.
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N4NYY
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Posts: 4817




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« Reply #5 on: March 22, 2013, 03:28:14 PM »

I have seen other inboard auto-tuners that are not happy trying to match a low VSWR to a better VSWR.  It shouldn't be a concern if the VSWR is already <1.5:1.  Just leave the tuner turned off and let the rig do it's thing.  You can't hurt anything, and the mismatch losses are minimal.

73,

Don, K2DC


Ditto.  I've seen this effect also.  Seems the algorithms (code) in the controllers aren't always equipped to deal with an already-low SWR.  Just turn the tuner off and use the rig.

I have an FT-950 and it will tune even with an already low SWR. I can see some programming telling the rig not to tune if the SWR is already low. But definitely not in my FT-950.

Now, I cannot recall for sure, but my Icom 746 may have behaved in the manner you mentioned.
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W5LZ
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Posts: 477




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« Reply #6 on: March 23, 2013, 03:37:43 AM »

I've had several radios do the same thing.  Basically, it's telling you that you don't need to use the tuner, it's not required.  So don't use it.  There's no practical/significant difference between a 1.5:1 and a 1:1 SWR.
 - Paul
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