[hpsdr] Pure Signal with Transverters

[Conrad Farlow]

That's great Clyde and is exactly what I wanted to hear. In fact I was 
about to ask that very question. Someone told me to make sure that pure 
signal is switched off during contests or you lose your frequency!!!! I 
think (hope) he was joking.

73

Conrad G0RUZ


On 30/01/2014 11:53, Clyde Washburn wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> 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 <mailto:k2ue at rochester.rr.com>
>
> 82 Lasalle Pkwy
>
> Victor, NY 14564-9610
>
> 585-317-7006
>
>
>
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