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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZAPQ5ODABKA4O75ONQQWAHEOXJ6JQNCR/?format=api",
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    "message_id": "[email protected]",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OVTQAPXETKGQ7WPW5JTPQLUVHLPBRWIT/?format=api",
    "sender": {
        "address": "mikflathead (a) aol.com",
        "mailman_id": "fcd20e5bda40477abef7b7264ca83f96",
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    "sender_name": "[email protected]",
    "subject": "[AMSAT-BB] Re: IC-9700 and PS 70 not playing well together",
    "date": "2022-03-02T15:28:15Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M5ZC3NVKDCLORMLFNZMIWKSU5IOYGKGQ/?format=api",
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    "content": "Dave, not referring to your problem, do you notice a big difference when changing polarity?   Wondered if it was worth the cost and effort to add polarity to my M2 antennas. Thanks for the info. Mike\n\n\n-----Original Message-----\nFrom: Ant Lefebvre <[email protected]>\nTo: Dave Julian <[email protected]>\nCc: AMSAT BB <[email protected]>\nSent: Tue, Feb 8, 2022 12:06 pm\nSubject: [AMSAT-BB] Re: IC-9700 and PS 70 not playing well together\n\nDave,\nI use a comet duplexer CF-4160N to avoid desense issues. It acts as a bandpass filter with 60dB of rejection from your 2m TX. The dummy load is on there, because I read somewhere it acts better with one attached since it would expect to be connected to something vs open.\nhttps://www.dxengineering.com/parts/cma-cf-4160n\n\n\n\n73\n-Ant NU1U\n\nOn Tue, Feb 8, 2022 at 11:41 AM Dave Julian via AMSAT-BB <[email protected]> wrote:\n\nJust got a new SSB SP 70 preamplifier for my IC-9700 andhaving an issue with working 435 RX satellites like RS-44. The amplifier works fine but I am getting terrible overloaadfrom the 2M TX signal. It causes the OVF light to come on and very distorted audio. I have lowered the RX gain and TXpower on the IC-9700 but by that time it kind of defeats the purpose of a preamplifier. My set-up is an M2 2MCP22 with fixedpolarity on 2m and a 436CP30 with the PS-70Cm polarity switch for UHF. I have about a 200' run on LMR-400 to the base of the towerwith lightning arrestors then about 40' of RG-213 to the antennas. For testing I have the Sp 70 preamplifier temporarlyinstalled at the base of the tower. No preamplifier for 2m. Power to the preamplifier is over the coax from the IC-9700.I am looking any any suggestions on sorting this out. I have removed the PS 70 at this point to avoid damage theradio or preamplifier. ThanksDave WB9YIG  \n-----------------------------------------------------------\n\nSent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA.\nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n\nView archives of this mailing list at\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to amsat-bb-leave(a)amsat.org\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n\n-----------------------------------------------------------\n\nSent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA.\nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n\nView archives of this mailing list at\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to amsat-bb-leave(a)amsat.org\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n\n\n",
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