[hpsdr] Pure Signal with Transverters

[Phil Harman]

Hi Clyde,

That’s a very satisfactory result – thanks for letting the group know of your success.

73 Phil...VK6PH

From: Clyde Washburn 
Sent: Thursday, January 30, 2014 7:53 PM
To: hpsdr at lists.openhpsdr.org 
Subject: [hpsdr] Pure Signal with Transverters

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I am pleased to report that Pure Signal can work very nicely on transverter bands as well, if you provide a suitable Tx mixer path back to the IF frequency.

 

I my case I started with a custom 2m & 432 transverter, which used a +23dBm-class mixer for receive, driven at +25dBm.  Since the LO amplifier is capable of +28dBm , I was able to increase the drive to it by 3dB, and then drive two +23dBm-class mixers at +25dBm each.  The added Tx channel is driven from a Bird VHF/UHF sampler in the common feedline to my log-periodic 2m/432 antennas, and applied to the mixer thru an attenuator adjusted for ~-17dBm output from the mixer, thru a 30MHz LPF (10m IF) to the Tx receiver input.  There are 1KW FET amps following the tranvserter on both bands ahead of the sampler.

 

Operation is exactly as expected on the lower bands, and suppression of IM to the -55 to -60dB below PEP level was readily obtained.  Clearly future transverter designs need to be full duplex and handle large enough signals to be useful for predistortion!

 

__________________

Clyde Washburn, K2UE

k2ue at rochester.rr.com

82 Lasalle Pkwy

Victor, NY 14564-9610

585-317-7006

 

 



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