Hi Kip,
Your question involves perhaps the most frequently misunderstood
aspect of FT-1000MP receiver operation, a result of the poorly
written description of Menu 8-4 on page 91 of the operating
manual . A much better description and illustration of pre-amplifier
selection menu 8-4 and the IPO front panel push button appears
on page 30 of the operating manual.
Two controls must be properly set to optimize FT-1000MP receiver
front-end performance on 160, 80 and 40 meters: Attenuator and
IPO. When IPO is enabled, it bypasses the pre-amplifier selected
by Menu 8-4.
The FT-1000MP has three pre-amplifiers:
- a 1.8 - 7 MHz pre-amplifier ( IPO should be enabled when
operating on 160, 80 and 40 meters to bypass this pre-amplifier)
- a pre-amplifier with excellent sensitivity on 24 and 28 MHz
- a wideband ( FLAT ) pre-amplifier with very poor 28 MHz sensitivity
The front panel IPO pushbutton bypasses the pre-amplifiers entirely,
feeding the antenna directly into the first mixer. I always enable
IPO when operating on 160, 80 and 40 meters.
The Attenuator should be set to the highest setting while providing
acceptable receiver sensitivity. I almost always set the attenuator
to 18 dB when operating on 160 meters.
I always set Menu 8-4 to TUNED , allowing the FT-1000MP to
automatically select the proper pre-amplifier for 12 and 10 meters,
I never use the 1,8-7 MHz preamplifier because I always enable
IPO when operating on those bands and I never set Menu 8-4 to FLAT .
73
Frank
W3LPL
----- Original Message -----
From: "Kip Edwards" <kedwards@ltol.com>
To: "Top Band Contesting" <topband@contesting.com>
Sent: Wednesday, June 15, 2016 2:07:09 PM
Subject: Topband: FT-1000MP
All,
I have been corresponding via email with Andy, SP6AEG,
regarding the 5J0P DXpedition and other topics. This morning I received the
following question from Andy:
"I received from Janusz SP6IXF as gift transceiver FT1000MP with a set of
filters in optional (2 kHz / 250 Hz) ssb / cw + roofing filter. I have a
dilemma, do not know who Receiver Front-End RF Amplifier should be active
for optimal performance for 160 m. I have a choice of flat or Tuned for low
band. Do you have on this subject some knowledge?"
Is there anyone on this reflector who can offer any help? I
know nothing about the
FT 1000MP (among many other things) but I'd like to help Andy.
Many thanks.
73 Kip W6SZN
G. Kip Edwards
Telephone: (206) 999-9403
email: kedwards@ltol.com
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