[1000mp] Re: SWR Problems with Mk-V Field

[carl at UDel.Edu]

Dear Ron,

Thanks for the input!  Originally, I had 2 ft of RG-8 going from the Mark-V Field to an antenna switch, and then 2 ft of RG-58 going from the switch to the external watt-meter/SWR meter, and then 2 ft of RG-58 attached to the dummy-load.  With your thoughts in mind, I went ahead and disconnected all of this and attached the dummy load directly to the Mark-V Field via 2 ft of RG-8, and everything stayed the same, except everywhere is was 1.4:1 came down to 1.3:1, and on 10-meters, the SWR went from 1.3:1 to 1.4:1.  It may be that the on-board SWR meter is just sensitive to the coax used (the coax is commercial, but obtained through a local CB supplier); on the other hand, it might be an indication of a problem developing.  Just wondering what others have experienced.

Thanks again, Ron, it is greatly appreciated!


Best Regards,
Carl - K3NTH

>
>Message: 4
>Date: Tue, 22 Jan 2008 19:15:11 -0500
>From: W4LDE-Ron <w4lde at cfl.rr.com>
>Subject: Re: [1000mp] SWR Problems with Mk-V Field
>To: All about Yaesu 1000mp <1000mp at mailman.qth.net>
>Message-ID: <4796870F.90402 at cfl.rr.com>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Carl,
>
>The change may be caused by the length of the coax between the rig and 
>the remote tuner.  I had a similar difference in readings using 
>manufactured coax w/ connectors between the amplifier and the rig and 
>the amplifier and the remote tuner.  See if you have some different 
>lengths of coax and see what readings you get.  I average about .2 
>differences after I changed the lengths.  Frankly I think that you will 
>never see the same readings and from your data below that meters are 
>within tolerances.
>
>73 de
>Ron W4LDE
>
>carl at UDel.Edu wrote:
>> I have a Mark-V Field hooked up to a G5RV and matched with a LDG AT200Pro autotuner.  I noticed the other day that my autotuner and my external watt-meter were claiming a 1:1 match, but the SWR meter on the Field was claiming 1.7:1.  While I don't expect everything to always read identical, I thought this rather strange.  I switched to a 50 ohm dummy-load, and did some investigating using the dummy-load:
>>
>> 160m - 1.1:1
>> 80m - 1.1:1
>> 40m - 1.0:1
>> 20m - 1.3:1
>> 17m - 1.4:1
>> 15m - 1.4:1
>> 12m - 1.4:1
>> 10m - 1.3:1
>>
>> All of these values were read from the SWR meter on the Mark-V Field; the autotuner and my external watt-meter/SWR meter are reading 1.0:1 on all bands  Might this be an indication of a problem, or have others noticed this discrepancy?  Any feedback would be most appreciated!
>>
>>
>> Thanks, and 73's!
>>
>> Carl - K3NTH
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>
>