[Kenwood] Re: [Yaesu] Why are we so SWR-phobic

[Rob Atkinson]

Every solid state medium wave AM broadcast rig I know of is designed to 
trip off if the line vswr goes above 1.2:1.  These are rigs that cost 
anywhere from $15K to $250K.  they are expensive and worth protecting.  
However, I understand my Yaesu mk V PA costs $700 to replace, which to 
me is a lot of money.  I'd prefer too much vswr protection rather than 
not enough.  For me it's a nonissue anyway since I hardly ever use the 
built in tuner since I run my exciters into various manual matching 
networks all the time.   the only difference between this, and running 
a "boat anchor" is that my tank circuit is outboard; the boat anchor's 
is between the high Z tube plate and the UHF jack on the back if the 
rig.  Either way you're adjusting caps and coil taps to make a tx work 
with a mismatch.

I use a rig's tuner occasionally when I want it to be happy driving my 
amp which has a tuned input that isn't always as close to 50 j0 as it 
should be.

73,

rob / k5uj


On Sunday, June 18, 2006, at 08:57 PM, Mike Brown wrote:

> Yes Glen, I'm with you on this one. I had a 746, nice rig, but at 1.5 
> swr it cut the power to 50 watts. When they do that, it makes me 
> wonder if the finals are inferior and they know that is the only way 
> to protect them. Especially on the low bands, the folks that will 
> spend a day getting the swr down to 1:1 crack me up. Oh well, to each 
> their own.
>
> 73, Mike K9MI
>
>
> ----- Original Message ----- From: "Glen Zook" <gzook at yahoo.com>
> To: "John Geiger" <w5td at lcisp.com>; "ICOM Reflector" 
> <icom at mailman.qth.net>; <kenwood at mailman.qth.net>; 
> <yaesu at mailman.qth.net>; <dx-list at yahoogroups.com>; 
> <cq-contest at contesting.com>
> Sent: Sunday, June 18, 2006 19 01
> Subject: Re: [Yaesu] Why are we so SWR-phobic
>
>
>> Now you understand why there are still a lot of "boat
>> anchors" (tube rigs) still on the air.
>>
>> Glen, K9STH
>>
>>
>> --- John Geiger <w5td at lcisp.com> wrote:
>>
>> Am I the only one who things that the SWR protection
>> circuits in currents are ridiculous?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Glen, K9STH
>>
>> Web sites
>>
>> http://home.comcast.net/~k9sth
>> http://home.comcast.net/~zcomco
>>
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