[CQ-Contest] Dayton atendees - tell us about the new Yaesu

[K3BU at aol.com]

In a message dated 5/19/04 11:30:32 AM Eastern Daylight Time, ua9cdc at r66.ru 
writes:
>>Very interesting presentation there. What I did not understand is why
Orion with 500hz roofing filter is worse then Orion with 1 khz roofing
at 2 kHz spaced dynamic range test?  There is * on the second line of
the table but no explanation what it means. Can somebody clear it up
for me please.

73, Igor UA9CDC<<


Orion has last two filter positions of 500 and 250 Hz selectivity configured 
with additional amplifier stage, aimed at compensating the loss of the 
narrower filters. This is causing degradation of overload performance and adding more 
noise.
Better solution is to use original 1000Hz filter position and replace the 
1000 filter with 600 Hz filter or disable the amps. W4ZV came up and collected 
orders for special order of 600 Hz filter kits from INRAD. This provides further 
improvement in excellent Orion performance without degradation due to the 
amps in the 500 and 250 designated positions.
It would have been better to not use amplifiers in those last positions and 
if more gain needed, use the preamp. 

Yuri, K3BU.us