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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HNSJIEQSXQ2T64JMNA3BAQE6BE3MCWAE/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000301c7bf45$a29941f0$c4e6fea9@WA4SCA",
    "message_id_hash": "HNSJIEQSXQ2T64JMNA3BAQE6BE3MCWAE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/267BPHE7WTDNSXJ6BTIBKNWAUSTWBRH4/?format=api",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: Yagi Antenna Comparison",
    "date": "2007-07-05T20:47:00Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7PDHHAS5O3ODMGT2JDGHYP3JLLLTKNJY/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CSJVS5RK555TCL4BDQ2WPUYI3PR4CUWC/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Joe,\n\nI recently replaced some 20 year old KLMs with M2s.  In most ways, the M2\nare BMWs and the KLMs are Yugos, though they did a good job.  (I need to do\na little refurbishing on the KLMs, and will probably have them for sale if I\nam satisfied with them.)  If you get the longer versions of each M2,\nrecommended, be prepared for poorly written documentation with some cut and\npast from the shorter versions which is simply wrong in one case, and very\nconfusing in others.  You can sort it out by phone easily enough, since M2\ndoes not return e-mail or phone messages in my experience.  Still, for\ndrawings dated 2000 to be this seriously in error, and not updated, does not\nspeak well for them.  \n\nThere were also a few parts, sealing rings for the type F connectors, which\nwere missing.  However, because I also ordered the CP switches, which had\nextras, I had enough.  Finally, on the 70 cm unit, there are some very tight\nbends at the connectors for the phasing and switching lines.  These need\nvery gentle installation, and some additional water proofing.  There is more\nthan enough length on the 2 meter version.  I didn't take the same to work\nit all out, but if they had added a wavelength to a couple of lines, or\nperhaps .5 wavelength to several, the needed phasing would have been\npreserved, and there would be no strain on the connectors.\n\nI checked everything I could think of on the ground, and found the SWR, and\nthe change with polarization, much better than with the KLMs.  When I got\nthe 2 meter version up, purely as an accident because of the particular SWR\nmeter I use, I found that there was a 1K ohm or so short between the rf and\ndc switching lines in the 2 meter unit.  I ended up opening the switching\nunit, easy enough, and found two things.  First, the dc lead to the\nswitching relay was just barely touching one of the rf leads.  It was easy\nto move the dc lead away, but the problem was highly visible, and should\nnever have been sold that way.  Second, there were a couple of places where\nthe rf wiring was connected using solder bridges because the wires were\npoorly installed.  Again, easily fixed, and totally unacceptable for a unit\nwhich lists for $201.\n\nThe overall impression is an outstanding design, with great attention to\ndetail, spoiled by some mind boggling carelessness in execution of rather\nsmall but important things.\n\nOnce you get them up and debugged, they really work well.  The KLMs had\nsignificant side lobes, and it is obvious that the M2s are quite a bit\nbetter from that standpoint, though I can't do AB measurements.  While I\nnever had any problems getting into AO-7, FO-29 or VO-52 with the KLMs, I\nhave noticed that I need to back off on the TX power significantly more than\nbefore to have a socially acceptable signal strength.  The same on AO-51 and\nthe other FM birds.  Of course, it is nice to be able to crank up the power\nwhen shooting through the trees, or when the bandits are on the AO-51\nuplink.  Now all I need to really test them are some P3 birds.\n\nAlan\nWA4SCA\n\n\n\n\n\n\n\n\n\n\n",
    "attachments": []
}