[Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

[Wes Stewart]

I'm not necessarily defining a personal situation.  But almost any 80 or 160 
antenna will suffice as an example.

I am currently constructing a vertical for those bands.  The model shows 2:1 on 
160 at resonance and >3:1 just 60 KHz away and this is with considerable ground 
loss.  Less loss would equal lower BW.  With quarter wave resonance on 80 at 3.6 
MHz it exceeds 3:1 at 3.8 MHz and is nearly 7:1 at 4.0.

Transmission line loss is a non-issue with 7/8" Heliax.

On 4/21/2017 6:28 AM, Jim Miller wrote:
> Wes
>
> Can you describe your affected antennas?
>
> 73
>
> Jim ab3cv
>
> On Apr 21, 2017, at 8:56 AM, Wes Stewart <wes_n7ws at triconet.org> wrote:
>
> A couple of points.
>
> If you believe that an SWR of >3 necessarily degrades the efficiency of an antenna, you are simply wrong.
>
> If the "tuner" components have to be derated to this extent then perhaps it should be called a line flattener rather than a tuner because a lot of guys are still going to need a tuner.
>
>
>
>> On 4/21/2017 4:34 AM, john at kk9a.com wrote:
>> The KPA1500 tuner range is fine. If your antennas have >3:1 SWR you need
>> to do some work outside. It will help your signal much more than the amp.
>> Even when I operated the RTTY Roundup in January after an ice storm my
>> antennas were within this amplifiers SWR range.
>>
>> John KK9A
>>
>> from: Wes Stewartn7ws
>> Fri Apr 21 01:18:59 EDT 2017
>> ]
>> Not enough full power tuner range.
>>