Igor,
Thank you for letting me know that you have managed to make some 3rd Order
IMD measurements on your HLA 300 Plus amplifier, and for the data.
My apology for not replying sooner, I managed to fracture one of my leg
bones (femur) on 30th March and have been in hospital recovering from the
surgery.
Home now :-)
73,
Geoff
LX2AO
----- Original Message -----
From: "Igor Sokolov" <[email protected]>
To: "Geoffrey Mackenzie-Kennedy" <[email protected]>
Cc: "Elecraft Discussion List" <[email protected]>
Sent: Saturday, April 06, 2013 9:16 PM
Subject: Re: [Elecraft] KX3 Amp
Geoff,
Thank you for the idea on how one can measure relative IMD of the
amplifier,
I have finally managed to do that with my HLA 300 Plus that I use with
KX3.
K3 of my friend was used as the source. Measurements were done with QS1R
SDR receiver.
K3 itself, with 2 tone engaged and running 100 W showed 3dr order IMD
at - 28db.
HLA 300 Plus was driven by the same K3 (5W drive) and at the output of
around 180 W (20 m band) showed -25db of the 3rd order IMD. Anything above
200 W makes IMD unacceptable (- 10db at 300W). The situation is a bit
better on lower bands (160 and 80m ) where one can go up to almost 250 W.
Anyway it seems that with 5 W drive and output power of below 200W, HLA
300 Plus can be used on all the bands quite successfully.
I have also modified the amp to work from PTT signal only, and disabled RF
VOX in it.
RF band sensing remained intact.
73, Igor UA9CDC
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