[NLRS] 857D

[Mike - KM0T]

I had the same issue with a FT-100D...toasted a DB6NT 10 GHz
transverter....never again....FT-817s have been used ever since.

73 - Mike- KM0T

-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
Behalf Of w0zq at aol.com
Sent: Monday, August 31, 2009 3:44 PM
To: nlrs at mailman.qth.net
Subject: Re: [NLRS] 857D




Joe, what IF drive level do you have the transverter set up to accept, and
how do you control that level?from the 857D - with the 857D "Power" control
in the setup menu ??? Most of these radios use active RF feedback control to
reduce the power based on your "Power" control setting, so they can indeed
produce a full output power spike right when you key down - I am not
familiar with the 857D enough to know if its specifically true for it.? You
may be able to mitigate this to some degree if you set up the transverter to
take the maximum drive level (10 watts?), then set the Power control on the
857D to give you that 10 watts - then a fast spike at 40 watts may not
damage the mixer ..... may not.?? This would be better than setting up the
transverter for say 1 watt of drive and then hitting it with a 40 watt
spike.



This is one reason why lots of the guys are?using 817's.? Also, the older 2m
multimode rigs like the TR751 and TM255 have internal drive pots that seem
to control the drive level itself rather than in a feedback mode, and thus
don't seem to be as much of a problem.?? Its the new higher power,
multiband, HF through 432 rigs that seem to have this characteristic.



PS:? Also a good idea to keep spare mixers in your parts box.



73, Jon

W0ZQ



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