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" <kedwa...@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: kedwa...@ltol.com NOTICE: This E-mail (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. 2510-2521, is confidential and may be legally privileged. Information contained in this e-mail message is intended only for the individual to whom it is addressed and is private and confidential. If you are not the intended recipient, or the employee or agent responsible for delivering this message to the intended recipient, any dissemination, distribution or copying of this communication is strictly prohibited. If you are not the intended recipient of this e-mail, please kindly destroy it and notify the sender immediately by reply e-mail. Please take standard precautions to mitigate virus issues. Thank you for your cooperation. _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband