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<DIV>Hi Clyde,</DIV>
<DIV> </DIV>
<DIV>That’s a very satisfactory result – thanks for letting the group know of
your success.</DIV>
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<DIV>73 Phil...VK6PH</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=k2ue@rochester.rr.com
href="mailto:k2ue@rochester.rr.com">Clyde Washburn</A> </DIV>
<DIV><B>Sent:</B> Thursday, January 30, 2014 7:53 PM</DIV>
<DIV><B>To:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</A> </DIV>
<DIV><B>Subject:</B> [hpsdr] Pure Signal with Transverters</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>*****
High Performance Software Defined Radio Discussion List *****<BR><BR>
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<P class=MsoNormal>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.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>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.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>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!<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>__________________<o:p></o:p></P>
<P class=MsoNormal>Clyde Washburn, K2UE<o:p></o:p></P>
<P class=MsoNormal><A
href="mailto:k2ue@rochester.rr.com">k2ue@rochester.rr.com</A><o:p></o:p></P>
<P class=MsoNormal>82 Lasalle Pkwy<o:p></o:p></P>
<P class=MsoNormal>Victor, NY 14564-9610<o:p></o:p></P>
<P class=MsoNormal>585-317-7006<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal><o:p></o:p> </P></DIV>
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