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

[brian]

John,

Don't agree--unless there truly is something wrong with the antenna, 
connections or feedline.

Does your 80 or 160M antenna cover the entire band with <3:1 SWR?

If fact, on those bands the extra loss due to SWR is negligible with 
even 5:1 SWR's with usual coax. On 80M with a 5:1 SWR and 150' of RG8, 
TLW computes an additional loss of about 0.5 dB. The 4.5 db gain due to 
the extra power far outweighs the extra feedline loss.  Factoring in 
tuner loss doesn't change the conclusions.  Even on 20M, the extra loss 
for the above would be about 1.3 dB.

My experience with ice is much different.  Adding ice to a 4 el quad, 
the resonant frequency on 20M would shift 400 KHz (lower) giving 4:1 
SWR's in the phone band.  One could load it but run of the mill baluns 
at the feedpoint would pop at legal limit!

73 de Brian/K3KO


On 4/21/2017 11:34 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.
>
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