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Re: Topband: AA-55Zoom Review

To: Jeff Blaine <>
Subject: Re: Topband: AA-55Zoom Review
From: Matthew King - AK4MK <>
Date: Wed, 13 Dec 2017 13:02:52 -0500
List-post: <>
Jeff - on my AA600, an OSL calibration is good until you change the
parameters of the calibration, i.e. moving away from the frequency/range
selected during the OSL calibration process.

I'm just assuming the others are the same.



On Wed, Dec 13, 2017 at 10:49 AM, Jeff Blaine <>

> Question regarding the OSL cal function on the unit.
> Let's say you do an OSL cal with a length of coax attached just as you
> would with a generic VNA.  For how long is that specific OSL CAL applied?
> I mean, does it persist until it's deleted, or until you change frequency
> away from the range covered by the original OSL CAL?  Or until it is
> powered off?  Or what?
> Thanks!
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> On 12/12/2017 5:41 PM, Dennis W0JX via Topband wrote:
>> All:
>> I have been working on installing a tower detuning circuit on my 80 foot
>> shunt fed tower. Of course I found had that the MFJ 259B to be totally
>> inadequate for adjusting the detuning circuit because of nearby BC RF on
>> 1520 Khz. Results did improve with the insertion of a 1510 Khz trap built
>> for me by KD9SV but results were still inconsistent.
>> I finally decided to buy a Rig Expert but had trouble deciding between
>> the AA-55 and the AA-230. The AA-230 covers 2 meters but that is not of
>> great interest to me. Another nice feature is the TDR graph function.
>> However, I discovered that the AA-55Zoom also has a TDR function but it
>> does require a connection to a laptop to use it effectively.
>> The deciding factor for me was the AA-55 performance on 160 meters. I
>> found a review by W9AC who said that the AA-55Zoom is basically
>> bullet-proof on 160 meters.
>> I ordered my AA-55 from DX Engineering and had it delivered in one day. I
>> am thrilled with the performance. I find that the most useful screen is the
>> one called "All Parameters" which shows all important factors. This is
>> extremely useful for putting the antenna or circuit right where you want
>> it. There is also a set of cable tools which make it very easy to cut
>> quarter-wave or half-wave stubs.
>> One thing - make sure that you use the "battery saver" function or the
>> batteries won't last more than 4 hours.
>> 73, Dennis W0JX
>> Milan, OH
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