[Elecraft] K3 - why SWR change with an amplifier

[W0MU Mike Fatchett]

Does the L7 have a tuned input?  If so you might need to adjust the 
tuned input on each band for the best match to the rig.

Mike W0MU

W0MU-1 CC Cluster w0mu.net


On 3/29/2012 6:22 PM, Jorge Diez CX6VM wrote:
> Don
>
> The amplifier is a Drake L7
>
> I will test with a ALS1300 to see what happens
>
> So what do you think? My L7 is doing something bad?
>
> I really dont like to see more than 3 bars in my K3 SWR meter. I tune with the internal tuner and is better, but I dont know if I had something bad that I need to solve
>
> Thanks
> Jorge
>
>
> Enviado desde mi BlackBerry® device de Antel
>
> -----Original Message-----
> From: Don Wilhelm<w3fpr at embarqmail.com>
> Sender: elecraft-bounces at mailman.qth.net
> Date: Thu, 29 Mar 2012 19:39:03
> To: ab2tc<ab2tc at arrl.net>
> Reply-To: don at w3fpr.com
> Cc:<elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K3 - why SWR change with an amplifier
>
> He did not say it was a KPA500!  Maybe it was some other amplifier that
> we cannot comment on.
> If it were the KPA500, I would have asked "what bands".
>
> 73,
> Don W3FPR.
>
> On 3/29/2012 7:26 PM, ab2tc wrote:
>> Hi,
>>
>> But is it normal for the KPA500 input SWR to be 2:1?
>>
>> Knut - AB2TC
>>
>>
>> Don Wilhelm-4 wrote
>>> Jorge,
>>>
>>> With the amplifier in standby, the K3 wattmeter sees the antenna SWR -
>>> the same as when the antenna is connected to the K3.
>>> When the amp is switched to operate, the K3 will see the input SWR of
>>> the amplifier - and that has no relationship with the antenna.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> <snip>
>>>
>> --
>> View this message in context: http://elecraft.365791.n2.nabble.com/K3-why-SWR-change-with-an-amplifier-tp7419653p7419681.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
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