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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HKSHUL3XEYDHNK4VM2KYCKRIYXMWIE46/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "HKSHUL3XEYDHNK4VM2KYCKRIYXMWIE46",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HKSHUL3XEYDHNK4VM2KYCKRIYXMWIE46/?format=api",
    "sender": {
        "address": "w3ab (a) yahoo.com",
        "mailman_id": "460885d5cb8b4383aa368244120c3868",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/460885d5cb8b4383aa368244120c3868/emails/?format=api"
    },
    "sender_name": "GEO Badger",
    "subject": "Re: [amsat-bb] Shoppinglist (Making a T notch filter)",
    "date": "2019-03-18T17:06:47Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "How about rolling your own?\n\nhttps://qrznow.com/145-mhz-low-loss-bandpass-helical-filter/\n\nhttps://www.arrl.org/files/file/Technology/Intermod/No_Tune_Filter.pdf\n\nOr DCI?\nhttp://dci.ca/\n___\nSent from my two way wrist watch\n73 de W3AB/GEOOn Mar 15, 2019, at 07:39, Hans BX2ABT <[email protected]> wrote:\n\nHello all,\n\nUnfortunately it's not one transmitter, but four of them (I thought 5, \nbut I just checked. Powers range from 1 - 10 kW), producing a lot of \nspurious signals and raising the noise floor by about 10 dB when \npointing the beam into that direction. I don't think stubs will be broad \nenough to cover 89 to 106 MHz, but I never worked with them, so I'm \nguessing here. I don't have any problems with FM stations leaking onto \n70 cm, just the air band, NOAA frequencies and 2 meters. My Airspy mini \nalso picks up lots of spurious signals  below 50 MHz, often hard enough \nto ID.\n\nI found this filter from Par Electronics \n(http://www.parelectronics.com/fm-broadcast.php), but it doesn't \nindicate if you can tx through it. Otherwise I will have to use it in \nthe shack and remove it when I want to tx on 2m, with the risk of \nforgetting it and blowing it up. Will a sequencer be a solution then?\n\n73 de Hans\n\nBX2ABT\n\n\nOn 03/15/2019 09:42 PM, Robert Bruninga wrote:\n\nAnd you can make it without all the connectors at the T if you want.\nThough it takes some close and inventive soldering of the \"T\". Since the\nFM band is 88 to 108 that (I think) is far enough from 145 to add minimum\nloss. But at UHF, one needs to carefully check to make sure that the FM\nfrequency is not also a multiple of the FM frequency.\n\nTell us the FM broadcast frequency and we can take a quick look.\n\nBob\n\n-----Original Message-----\nFrom: AMSAT-BB <[email protected]> On Behalf Of Wendy and Terry\nOsborne\nSent: Thursday, March 14, 2019 11:50 PM\nTo: [email protected]; Hans BX2ABT <[email protected]>\nSubject: Re: [amsat-bb] Shoppinglist\n\nHi Hans,\n\nIf you have a plenty of RG213 and suitable connectors, you could try\nmaking a Coax stub filter.\nYou need a cable length that is an odd multiple of a quarter wave length\nlong at the FM Tx frequency and an even multiple of a quarter wave at the\nfrequency that you want (2M /70CMs).\nA single RG213 stub would have about 25dB of rejection and would pass 100\nWatts OK.\nYou just need a coax T connector and some matching connectors.\nTo trim the stub, use a set of garden secateurs.\nIf you have a Bao feng or similar radio you could use that on the FM band\nattached to your T and trim the stub for minimum signal on the unwanted Tx\nfrequency.v dir=\"auto\">I haven't run the calculations for how long the stub should be but if it's\nuseful I could do so.\n\n73,\nTerry Osborne ZL2BAC\n\n\n-----Original Message-----\nFrom: Hans BX2ABT\nSent: Thursday, March 14, 2019 12:33 AM\nTo: [email protected]\nSubject: [amsat-bb] Shoppinglist\n\nMy sis-in-law will be visiting from the States soon and I usually make her\nbring some stuff for me so I can save on freight costs. She will\ndefinitely bring an Arrow Antenna so I can start some portable operations.\nA Sony voice recorder is also on my list, as well as some coax cable\n(RG-400 is what I'm thinking of. Really expensive here).\nDon't have a budget for much more, but since I have a clear line-of-sight\nto some 10 kW FM transmitters from my QTH I thought I should at least get\na good FM-band notch filter.\n\nAny recommendations on where to buy this in the US? I haven't found\nanything when I googled, not even a lot of 2/70 band pass filters, or low\npass filters to prevent desensing on 70 cm. My own creations have a too\nhigh insertion loss, so this time I really want something a bit more\nprofessional and something that can handle at least 100 Watts of power.\nAny recommendations are welcome. Cheers. --Hans BX2ABT\n\n\n\nSent via [email protected]. AMSAT-NA makes this open forum available to\nall interested persons worldwide without requiring membership. Opinions\nexpressed are solely those of the author, and do not reflect the official\nviews of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\n\nSent via [email protected]. AMSAT-NA makes this open forum available to\nall interested persons worldwide without requiring membership. Opinions\nexpressed are solely those of the author, and do not reflect the official\nviews of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\nSent via [email protected]. 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.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\n\n\n\n\n\nSent via [email protected]. 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.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}