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    "message_id": "CANDxhckByV=i-vZo-6VSuQWLhBp1PC0u1D3p0O+yBwQYk1=3Cw@mail.gmail.com",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OVTQAPXETKGQ7WPW5JTPQLUVHLPBRWIT/?format=api",
    "sender": {
        "address": "anthony.lefebvre (a) gmail.com",
        "mailman_id": "d612b5711f7549379929c2e9da09f555",
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    "sender_name": "Ant Lefebvre",
    "subject": "[AMSAT-BB] Re: IC-9700 and PS 70 not playing well together",
    "date": "2022-02-08T17:07:14Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OVTQAPXETKGQ7WPW5JTPQLUVHLPBRWIT/?format=api",
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        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZAPQ5ODABKA4O75ONQQWAHEOXJ6JQNCR/?format=api"
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    "content": "Dave,\n\nI use a comet duplexer CF-4160N to avoid desense issues. It acts as a\nbandpass filter with 60dB of rejection from your 2m TX. The dummy load is\non there, because I read somewhere it acts better with one attached since\nit would expect to be connected to something vs open.\n\nhttps://www.dxengineering.com/parts/cma-cf-4160n\n\n[image: image.png]\n\n73\n-Ant NU1U\n\n\nOn Tue, Feb 8, 2022 at 11:41 AM Dave Julian via AMSAT-BB <[email protected]>\nwrote:\n\n> Just got a new SSB SP 70 preamplifier for my IC-9700 and having an issue\n> with working 435 RX satellites like RS-44.\n>\n> The amplifier works fine but I am getting terrible overloaad from the 2M\n> TX signal. It causes the OVF light to come on and\n>\n> very distorted audio. I have lowered the RX gain and TX power on the\n> IC-9700 but by that time it kind of defeats the purpose\n>\n> of a preamplifier. My set-up is an M2 2MCP22 with fixed polarity on 2m and\n> a 436CP30 with the PS-70Cm polarity switch for UHF.\n>\n> I have about a 200' run on LMR-400 to the base of the tower with lightning\n> arrestors then about 40' of RG-213 to the antennas.\n>\n> For testing I have the Sp 70 preamplifier temporarly installed at the base\n> of the tower. No preamplifier for 2m.\n>\n> Power to the preamplifier is over the coax from the IC-9700. I am looking\n> any any suggestions on sorting this out.\n>\n> I have removed the PS 70 at this point to avoid damage the radio or\n> preamplifier.\n>\n>\n>\n> Thanks\n>\n> Dave WB9YIG\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n\n\n",
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