Recently bought a set of the Bose Noise Reducing headphones for contesting
based upon positive comments in the list archives.
While they do zero out a huge amount of transceiver fan noise and computer
whine, I have encountered two serious problems and am desperate for your
suggestions.
Rig = FT 1000 MK 5 + coax feed (incl. a coax rf choke and a w2du type
current balun) + wire ocfd. Runs up to 200 w rf at swr < 1.5 to 1 using
rig's built in tuner.
Problem 1: Bose headphones pick up a cw transmit (rf?) thump - slight on
the Low NR setting of the phones, huge on the High NR setting on the
phones. Added 8 turns of the headphone cable thru a snap together MFJ
torroid - didn't help. Intensity of thump varies band to band.
Reducing the power setting on the rig helps, but is not a viable
solution :).
My goal would be to be able to use the phones on the high NR
setting - it seems to provide valuable audio gain. Operating with the low
setting seems like running the rig with the attenuator on.
Problem 2: SSB: Transmitting voice on ssb with the rig's "monitor"
feature, using the stock Yaesu hand mike, creates ungodly feedback.
Thanks for any ideas - hope I don't have to give these things back
Tim
N5IIT
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