The fact that your substitute replacement SRD seems to mostly work
indicates it's in the right speed class for the application. Did you try
any of the the adjustments in the driver to it? SRDs typically need a
bias adjustment and RF matching network tweaked for the particular part,
not just the type. Even if you could find an original HP part, you'd
still have to adjust for it.
You can find info on this on page 8-23 of the manual I have
(05065-9041). If yours is different, look in the section regarding the
A3 multiplier "e. A3 MATCHING NETWORK ADJUSTMENTS." This refers to
Section 5-25 (page 5-13 in my manual) for the actual procedure.
The device package style and mounting environment is also a factor, so
your SMT versus the original (DO-35?) would be different, but chances
are you may have landed close enough already to be within tweaking
range. Good luck.
Ed
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