Posted: 6/2/2016 11:03:28 AM EDT
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Anyone have an easy method for a test setup to check the full range of a tuner? I have a Z11PROII that I think has some issues in particular bands but it's in a mobile environment so I'm not exactly sure if it's the tuner or the fluctuations in tuning due to the nature of being mobile.
I guess what I'm saying is there a sort of untuned dummy load, something that simulates an antenna out of tune but within reasonable range that I could test against across the bands? |
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I'm not aware of any. I just do the obvious to simulate antenna Z - solder R to an L or a C.
If you wanted to get tricky, you could put a 50 ohm dummy load on another (manual) tuner, and then you would have continuously variable impedance to present to your other tuner. Calculation or measurement with an antenna analyzer gives you the Z of the network. |
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Quoted:
Anyone have an easy method for a test setup to check the full range of a tuner? I have a Z11PROII that I think has some issues in particular bands but it's in a mobile environment so I'm not exactly sure if it's the tuner or the fluctuations in tuning due to the nature of being mobile. I guess what I'm saying is there a sort of untuned dummy load, something that simulates an antenna out of tune but within reasonable range that I could test against across the bands? The manual says 6-1000 ohms with coax and 6-4000 with a 4:1 balun attached. Manual |
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Only true method I can think of is to connect an antenna of known mis-match and see if it will tune it up.
Another way, not real scientific, would be to build dummy loads at the extremes of the tuners range (6-1000) per above. Just remember resistors won't behave like a real antenna. |
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Quoted:
Maybe it just needs reset somehow. I swear it used to spin up and lock almost instantly on just about anything but now it takes ages to find a match and once I unkey and rekey it cycles again. It has a memory tune, and full tune function, memory tune is quick, but not good for mobile antennas, full tune takes a while. Did you RTFM? 
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Quoted:
I'm not aware of any. I just do the obvious to simulate antenna Z - solder R to an L or a C. If you wanted to get tricky, you could put a 50 ohm dummy load on another (manual) tuner, and then you would have continuously variable impedance to present to your other tuner. Calculation or measurement with an antenna analyzer gives you the Z of the network. Concur, a manual tuner would let you present some pretty funny loads. I have access to big variable caps and a lovely roller inductor, so I would hook those up to a 50 ohm load and use the AIM4170 to tune to a particular load and then have the tuner under test attempt to match that. |
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Quoted:
Maybe it just needs reset somehow. I swear it used to spin up and lock almost instantly on just about anything but now it takes ages to find a match and once I unkey and rekey it cycles again. You might call the company. Years ago when it was a very small company, I called, the owner/ designer answered the phone and we had a short discussion. He then had me send it in. It was returned within 10 days no charge! He was very interested in the problem as he does the design work and wants a good product and wanted to know first hand the problems in the field. He may also have an answer for you over the phone. |