[Elecraft] SWR

[Eric Swartz - WA6HHQ, Elecraft]

While the K3 will reduce power around a 2:1 SWR to protect the PAs, since we control power with a long hold time via the uC and DSP and not with an analog ALC loop, that will not make TX IMD worse.

73,
Eric
elecraft.com
_..._



> On Feb 11, 2015, at 7:08 PM, Matt VK2RQ <matt.vk2rq at gmail.com> wrote:
> 
> The issue with running with an SWR of 2:1 is that many modern radios have fold back protection circuitry that will introduce non-linearity under such conditions and produce IMD products. For this reason it is usually better to avoid running into such mismatched loads.
> 
> 73,
> Matt VK2RQ
> 
>> On 12 Feb 2015, at 5:00 am, Ken G Kopp <kengkopp at gmail.com> wrote:
>> 
>> IMHO ....
>> 
>> There is far too much emphasis put on chasing  "perfect" SWR readings.
>> 
>> Except in rare instances SWR's of 2:1 or less are OK in the real world, and
>> most would be hard-pressed to tell any difference.
>> 
>> I have a friend who recently spent several days fretting and climbing over
>> a reading of 1.7: 1.... (;-)
>> 
>> 73
>> 
>> Ken - K0PP
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