To: k3mm@erols.com, n6tv@VNET.IBM.COM, yaesu@contesting.com
cc: (bcc: Tyler G Stewart/BENN/CEC)
Subject: Re: [Yaesu] FT-1000MP First Impressions on 160
After thinking about what Yaesu is trying to achieve with the
Low-Band preamp, I concluded the following:
--the Low-Band preamp is primarily for cases where there are strong
local out-of-band (i.e. out of 1.8-7.5 MHz) signals which are causing
interference. Examples would be very close proximity to Broadcast
stations, multi-multis, etc.
--the Flat preamp is about 10 dB more sensitive than the Low-Band
preamp on 160.
--for very strong in-band IMD problems (i.e. a 160 contest), IPO is the
solution independent of whether Tuned or Flat is selected, since it
bypasses either preamp. I still have yet to hear my first IMD product
using Flat and I listened during a fairly good pileup on ZS8IR the
other evening, so the front end without IPO is fairly good.
**Theoretically, the Tuned position on the low bands (80 & 160) should
provide even better intermod
**response than the IPO setting, as that preamp has additional BP filtering
in it BEFORE the mild amplifier
**that it contains, although I've never noticed a situation where I really
needed it. The low band
**performance is already quite good, as it goes through a relay-switched
band-specific LP or HP filter,
**then a PIN diode selected bandpass filter section, and then through
whichever preamp (or lack thereof)
**you select!
My plans are to use Flat everywhere except 10 meters, where the Hi-Band
preamp has significantly more gain than the Flat preamp.
**Yeah, it's too bad they didnt make the low-noise preamp available on 20
and 15 for those quiet nights
**over-the-pole! However, it's still better than the older 1000.
73, Tyler K3MM
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