Great stuff, Joe! Thanks! The next question is, did you install the SRA-3H as MCL intended, or did you keep the Drake hookup where the RF and LO ports were swapped?
73 -Jim On Sat, 31 Jan 2009 12:33:49 -0500, Joe Pyles wrote: >I don't have any hard numbers but the receiver seems more sensitive >and quiet. In the datasheet for the SRA-3H the performance graphs >show it with +14 dbm, +17dbm, and +20 dbm and the performance >is almost identical. I called Mini-Circuits when I bought the SRA-3H >and talked to one of the engineers and he recommended this mixer as >it has 8 schottky diodes in it as opposed to 4 diodes in the level 13 >mixer. he said that this would make it less susceptible to overload >from strong signals. He said that if the mixer actually was operating >with +13 dbm instead of +17 dbm the only thing that I would even notice was >about a 0.5 db higher conversion loss. On 10 meters at 28.500 with a >known good up converter board the calibrator would give exactly an >s9, with this board with the SRA-3H the calibrator gives about 5 db over s9. > > >http://www.minicircuits.com/pdfs/SRA-3H+.pdf > >73, Joe, KC9LAD. > > > >At 09:30 PM 1/30/2009, you wrote: >>On Fri, 30 Jan 2009 00:25:59 -0500, Joe Pyles wrote: >> >> >In my TR7A I have a Mini-Circuits SRA-3H. It is a level 17 mixer. >> The TR7 brochure entitled "The Technology of Our Times" by Ron >> Wysong stated that the TR7 has +17 dbm LO. >> >so I choose this mixer. I believe the receiver is actually a >> little better than with the original Vari-L mixer. >> >> >>So which is it really, +13 or +17? Has anyone empirically measured the >>LO level? Joe, do you have any hard numbers on the performance of the >>SRA-3H? >> >>73 >> >>-Jim >> >> >>-- >>Ham Radio NU0C >>TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, >>GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! >> >>HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ >>http://radiojim.exofire.net >>http://incolor.inetnebr.com/jshorney >>http://www.nebraskaghosts.org >> >> >> >>_______________________________________________ >>Drakelist mailing list >>[email protected] >>http://mailman.zerobeat.net/mailman/listinfo/drakelist > > -- Ham Radio NU0C TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim.exofire.net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
