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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CSJVS5RK555TCL4BDQ2WPUYI3PR4CUWC/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "CSJVS5RK555TCL4BDQ2WPUYI3PR4CUWC",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/267BPHE7WTDNSXJ6BTIBKNWAUSTWBRH4/",
    "sender": {
        "address": "stargatesg1 (a) verizon.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Stargate",
    "subject": "[amsat-bb] Re: Yagi Antenna Comparison",
    "date": "2007-07-06T00:04:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HNSJIEQSXQ2T64JMNA3BAQE6BE3MCWAE/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Alan,\n\tThanks for the tips. I just ordered both the M2, 2MCP22 and 436CP42UG\nand figured they will be a bear to construct.\nTips are always helpful when traveling uncharted waters:-)\n\n73's\nRoD\nKD0XX\n\nA good friend will come and bail you out of jail,\nA TRUE friend will be sitting next to you saying.....\n\n\n\"DAMN THAT WAS FUN\"\n\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]]On\n> Behalf Of Alan P. Biddle\n> Sent: Thursday, July 05, 2007 4:47 PM\n> To: [email protected]\n> Subject: [amsat-bb] Re: Yagi Antenna Comparison\n>\n>\n> Joe,\n>\n> I recently replaced some 20 year old KLMs with M2s.  In most ways, the M2\n> are BMWs and the KLMs are Yugos, though they did a good job.  (I\n> need to do\n> a little refurbishing on the KLMs, and will probably have them\n> for sale if I\n> am satisfied with them.)  If you get the longer versions of each M2,\n> recommended, be prepared for poorly written documentation with\n> some cut and\n> past from the shorter versions which is simply wrong in one case, and very\n> confusing in others.  You can sort it out by phone easily enough, since M2\n> does not return e-mail or phone messages in my experience.  Still, for\n> drawings dated 2000 to be this seriously in error, and not\n> updated, does not\n> speak well for them.\n>\n> There were also a few parts, sealing rings for the type F\n> connectors, which\n> were missing.  However, because I also ordered the CP switches, which had\n> extras, I had enough.  Finally, on the 70 cm unit, there are some\n> very tight\n> bends at the connectors for the phasing and switching lines.  These need\n> very gentle installation, and some additional water proofing.\n> There is more\n> than enough length on the 2 meter version.  I didn't take the same to work\n> it all out, but if they had added a wavelength to a couple of lines, or\n> perhaps .5 wavelength to several, the needed phasing would have been\n> preserved, and there would be no strain on the connectors.\n>\n> I checked everything I could think of on the ground, and found\n> the SWR, and\n> the change with polarization, much better than with the KLMs.  When I got\n> the 2 meter version up, purely as an accident because of the\n> particular SWR\n> meter I use, I found that there was a 1K ohm or so short between\n> the rf and\n> dc switching lines in the 2 meter unit.  I ended up opening the switching\n> unit, easy enough, and found two things.  First, the dc lead to the\n> switching relay was just barely touching one of the rf leads.  It was easy\n> to move the dc lead away, but the problem was highly visible, and should\n> never have been sold that way.  Second, there were a couple of\n> places where\n> the rf wiring was connected using solder bridges because the wires were\n> poorly installed.  Again, easily fixed, and totally unacceptable\n> for a unit\n> which lists for $201.\n>\n> The overall impression is an outstanding design, with great attention to\n> detail, spoiled by some mind boggling carelessness in execution of rather\n> small but important things.\n>\n> Once you get them up and debugged, they really work well.  The KLMs had\n> significant side lobes, and it is obvious that the M2s are quite a bit\n> better from that standpoint, though I can't do AB measurements.  While I\n> never had any problems getting into AO-7, FO-29 or VO-52 with the KLMs, I\n> have noticed that I need to back off on the TX power\n> significantly more than\n> before to have a socially acceptable signal strength.  The same\n> on AO-51 and\n> the other FM birds.  Of course, it is nice to be able to crank up\n> the power\n> when shooting through the trees, or when the bandits are on the AO-51\n> uplink.  Now all I need to really test them are some P3 birds.\n>\n> Alan\n> WA4SCA\n>\n>\n>\n>\n>\n>\n>\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}