[TowerTalk] SWR Readings

[Robert Chudek - K0RC]

Hello Ralph...

I concur with Don, VE6JY's observations.

I have the AEA HF Analyst meter. When I tried using it at field day it 
went "wild", sometimes plotting reasonable VSWR graphs and other times 
(same antenna, no change except to rescan a second time) it went "nuts" 
with odd readings. Soon I related the behavior to the other guys keying 
CW and testing the SSB stations in other tents. The meter worked fine as 
long as they were not transmitting.

There are BC Band filters that can be inserted inline. But I don't know 
whether this would affect the VSWR readings you are trying to make. 
Here's one of those (receive only) filters for $65: 
http://www.arraysolutions.com/Products/bcb_filters_top1.htm

Hopefully others will comment whether they have used these and if it 
solves the measurement consistency issue you are seeing. My qth is 
pretty isolated from any local BC energy so I have not tried one of 
these myself.

73 de Bob - KØRC in MN

------------------------------------------------------------------------
On 8/20/2012 10:09 PM, Don Moman VE6JY wrote:
> if you have significant energy from local broadcasting stations, it will
> overwhelm the broad band circuitry
> and elevate the readings.  I am over 80km from the nearest broadcast
> station but the MFJ type of analyser  is almost pinned on any of the 160
> meter dipoles here.  It's OK on 80m and up.
>
> 73 Don
> VE6JY
>
>
> On Tue, Aug 21, 2012 at 3:04 AM, Jim Brown <jim at audiosystemsgroup.com>wrote:
>
>> On 8/20/2012 7:42 PM, Ralph Fedor wrote:
>>> Why is that?  Which should I believe?
>> I would expect differences relating to the quality of the SWR circuit
>> and it's calibration.
>>
>> As a wise man once said  -- "a man who has two watches never knows what
>> time it is."  :)
>>
>> 73, Jim K9YC
>> _______________________________________________
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>>
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