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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6LBAEYQLV4BG4FV662WQWCRWUAWLOSZ3/",
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    "message_id": "[email protected]",
    "message_id_hash": "6LBAEYQLV4BG4FV662WQWCRWUAWLOSZ3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OVTQAPXETKGQ7WPW5JTPQLUVHLPBRWIT/",
    "sender": {
        "address": "w8eh.ernie (a) gmail.com",
        "mailman_id": "7a040161827a4a5db92c1f01c6b2e908",
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    "sender_name": "Ernie",
    "subject": "[AMSAT-BB] Re: IC-9700 and PS 70 not playing well together",
    "date": "2022-02-08T21:53:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OVTQAPXETKGQ7WPW5JTPQLUVHLPBRWIT/",
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    "content": "\r\nDave,\r\n\r\nI also had bad interference to my IC-9700 while working sats & receiving \r\non 435. I have SSB preamps installed at the antennas on both bands. My \r\npreamps power with separate injectors on the coax, not from the radio. \r\nThe solution to the problem was to climb up on the roof and install the \r\n2m/70cm diplexer on the input of my 70 cm preamp (as the AMSAT mode J \r\ntip page says).  I also installed a second diplexer in the shack on the \r\n2 meter side between the radio and DC injector to minimize the 3rd \r\nharmonic interference.\r\n\r\nI still get some very minor interference when pointed specific \r\ndirections (toward other antennas on my roof), but the problem is gone \r\n95% of the time.\r\n\r\nErnie W8EH\r\n\r\nOn 2/8/2022 11:40 AM, Dave Julian via AMSAT-BB wrote:\r\n>\r\n> Just got a new SSB SP 70 preamplifier for my IC-9700 and having an \r\n> issue with working 435 RX satellites like RS-44.\r\n>\r\n> The amplifier works fine but I am getting terrible overloaad from the \r\n> 2M TX signal. It causes the OVF light to come on and\r\n>\r\n> very distorted audio. I have lowered the RX gain and TX power on the \r\n> IC-9700 but by that time it kind of defeats the purpose\r\n>\r\n> of a preamplifier. My set-up is an M2 2MCP22 with fixed polarity on 2m \r\n> and a 436CP30 with the PS-70Cm polarity switch for UHF.\r\n>\r\n> I have about a 200' run on LMR-400 to the base of the tower with \r\n> lightning arrestors then about 40' of RG-213 to the antennas.\r\n>\r\n> For testing I have the Sp 70 preamplifier temporarly installed at the \r\n> base of the tower. No preamplifier for 2m.\r\n>\r\n> Power to the preamplifier is over the coax from the IC-9700. I am \r\n> looking any any suggestions on sorting this out.\r\n>\r\n> I have removed the PS 70 at this point to avoid damage the radio or \r\n> preamplifier.\r\n>\r\n> Thanks\r\n>\r\n> Dave WB9YIG\r\n>\r\n>\r\n> -----------------------------------------------------------\r\n>\r\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\r\n> to all interested persons worldwide without requiring membership. Opinions expressed\r\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\r\n> Acceptable Use and Privacy Policies available athttps://www.amsat.org/about-amsat/\r\n>\r\n> View archives of this mailing list at\r\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\r\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\r\n> Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org\r\n\n\n",
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