On Jan 9, 9:45*am, Andy wrote:
On Jan 9, 10:23*am, Darryl Ramm wrote:

I was not aware the Cambridge 302A (the 302 variant with no vario) has
an option for ENL, I believe all Cambridge 300 series computers/
loggers have ENL recording. The Cambridge 302-MG variant is intended
for motorgliders and has an external speaker for the vario/STF audio.
This allows you to hear the vario over the engine but is unrelated to
ENL per se (although it may reduce pickup of the audio vario, but the
basic 302 seems pretty good at that already). All versions of the
Cambridge 302 have ENL (engine noise level) recording AFAIK.

Early deliveries of the 302 did not include ENL as it had not been
fully developed or approved. *Some customers, including myself, had
ENL retrofitted when it became available. *The ENL mod required
elimination of the internal speaker and forced the use of an external
speaker. *At that time the ENL retrofit was no cost since Cambridge
had marketed the 302 as having ENL capability.

When ENL became available Cambridge then marketed 2 versions of the
302, one with ENL, and one without. *ENL was an additional cost
option.

Perhaps the design has changed since then and ENL is now available in
conjunction with an internal speaker.

Andy

Andy

Thanks for the background. My (non-MG version) 302 from ~3 years ago
had ENL recording. IGC files claim ENL in the I record (extended data)
and as data in the B records. Now wether it spent most of it's time
recording it's own internal vario speaker and was kind of usless for
any real ENL recording is another point. I'm basing my entire
experience that plain 302's, at least in the last few years, have ENL
on that one transponder. Is this right?

If all 302s now have ENL then I read the Cambridge 302 approval
document as kind of ambiguious since it talks about motorglider
approval for the 302 "with ENL option" but if all 302 now do record
ENL do we assume they would be usable in principle for all badges and
records in motorgliders as per the approval document. Or does it
really mean the approval is only for the MG version with an external
speaker? Seems the approval doc could do with a some clarification if
the later is the case. (or am I missing something? Marc?).

Darryl