[Elecraft] KX3 Amp

[Igor Sokolov]

I do not have equipment to accurately measure IMD of my combo of KX3 and HLA 
300 Plus. Having said that I drive HLA 300 with 5 w from KX3. It gives me 
200 + watt on all the bands. Listening to the radiated signal using TS590 
and different antenna reveals that the occupied bandwidth is within the same 
boundaries which I  have determined by transmitting 100 W from my K3. 
Therefore I assumed that IMD of the above mentioned combo is no worth then 
30db.

73, Igor UA9CDC

----- Original Message ----- 
From: "Dyarnes" <w7aqk at cox.net>
To: <elecraft at mailman.qth.net>
Sent: Monday, March 25, 2013 10:40 PM
Subject: [Elecraft] KX3 Amp


> Hi All,
>
> To echo Jim Brown's cautionary statement about IMD with the RM Italy HLA 
> series amps, there is some good info on Tom Rausch's (W8JI) website 
> concerning the HLA-150.  That amp will run up to 150 watts or so, but 
> according to some testing that Rausch did, if you go much over 100 watts, 
> the IMD gets pretty marginal!  Presumably the HLA-300 have some similar 
> optimal point below it's maximum capability.  Apparently this is not at 
> all uncommon, particularly with 12 V. amps.  Even the K3 loses some of 
> it's IMD quality if you go over 100 watts, which you can do somewhat.
>
> Dave W7AQK
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