[Elecraft] K3 - why SWR change with an amplifier

[N5GE]

I believe the Drake L7 is basically the same as the L4B.  If so, the amp has
tuned input.  The rear panel should have holes for tuning the input to match the
rig.  Be sure you use an insulated screw driver when adjusting the inputs.

Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member

On Thu, 29 Mar 2012 18:29:30 -0600, W0MU Mike Fatchett <w0mu at w0mu.com> wrote:

>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
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