[1000mp] SWR Problems with Mk-V Field

[W4LDE-Ron]

Bob,

I am guessing that the total length between the rig and the tuner is 
about 10ft, 3 different lengths, one is 2ft to a LPF, 3FT from the LPF 
to the amp and 5ft from the amp to the tuner.   I used RG8 for all, RG58 
should be OK.  If your using one of those pre-made cables like you can 
buy at Radio shack throw them away.  Maybe good for CBer's but not 
hams.  I learned that those cables leave allot to be desired.

What the FT is seeing is the swr between the tuner and the rig, the 
tuner is seeing whats between the tuner and the antenna, you should 
expect some differences.

Best regards - Ron W4LDE



Bob Main wrote:
> Ron, just wondering what lengths of coax are you talking about?  I had
> always been told that it needed to be as short as possible and that it could
> be RG-58.
>
> Bob
> KB4CL
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
> On Behalf Of W4LDE-Ron
> Sent: Tuesday, January 22, 2008 7:15 PM
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] SWR Problems with Mk-V Field
>
> 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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