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
--
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HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
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