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Satellite iGate Discussion

Discussion in 'Satellite and Space Communications' started by K3RLD, May 9, 2017.

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  1. KE8FZT

    KE8FZT Ham Member QRZ Page

    What kind of Walmart amp do you have? I have been attempting with an RCA amp and a discone but have not had much success so far... I have a 3/4 wave ground plane on the roof, and I was hoping I would hear at least something with the squelch wide open on an 80 degree pass, but no success with either.
     
  2. K3RLD

    K3RLD Ham Member QRZ Page

    I'll have to dig up the specs again... don't have them handy. I will say that I am starting to doubt the effectiveness of a 3/4 wave compared to 1/4 wave. I know the idea is to move the gain toward the horizon for more effective coverage of all passes, but what I am seeing is that my 1/4 wave (unamplified) seems to do a better job.

    What I THINK is happening (experts feel free to comment) is that the signals on low passes are just too faint to pick up with the 3/4 wave, even with an amp. The 1/4 wave is more effective at getting the higher elevation passes - and thus while I simply cannot collect packets below, say, 30° - the 1/4 wave at least allows me to get the packets from about 45° to 80°.

    I did another head-to-head this morning on a 70° pass (both systems unamplified):

    3/4 wave with baofeng vs. 1/4 wave with SDR: each only pulled in one packet. Bother were different packets, about a second apart. Both only decoded with a single direwolf mark/space decoder, and both required a single bit flip to decode correct. Translation is: TERRIBLE! I'm trying one more thing with the 3/4 wave, and if I see no improvements I'm going to go back to the amplified 1/4 wave.
     
  3. AD5KO

    AD5KO Ham Member QRZ Page

    # logresp GASR verified, server FIFTH [Fri Sep 01 11:44:48 CDT 2017]
    W0SX-3>TTSY7U,RS0ISS*,qAR,W0ARP-15:`y;l Q[/>"70}CQ via ARISS Larry EN34fp w0sx@arrl.ne= [Fri Sep 01 11:51:00 CDT 2017]
    KC9YTT>CQ,RS0ISS*,qAR,W0ARP-15:please email KC9YTT@Outlook.com 73's via ISS!! [Fri Sep 01 11:51:02 CDT 2017]
    KA8YES-6>CQ,RS0ISS*,qAR,W0ARP-15:=4022.01N/08032.32W-SatGate EN90ri emt31@emtchunks.net Hello Via ISS [Fri Sep 01 11:51:20 CDT 2017]
    KB8OTK-9>TPSP4T,RS0ISS*,qAR,KK4NAM:`m?"!,o./]"7k}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:52:42 CDT 2017]
    WB4UAH>S6RP3T,RS0ISS*,qAR,KD8THX-6:`p__l"fK\>^ [Fri Sep 01 11:53:12 CDT 2017]
    KB8OTK-9>TPSP5V,RS0ISS*,qAR,KD8THX-6:`m?Yo^q./]"7X}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:14 CDT 2017]
    KB8OTK-9>TPSP5W,RS0ISS*,qAR,KD8THX-6:`m?^ohq./]"7Y}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:17 CDT 2017]
    KE0JMK>CQ,RS0ISS*,qAR,KD8THX-6:CQ [Fri Sep 01 11:53:20 CDT 2017]
    KB8OTK-9>TPSP5X,RS0ISS*,qAR,KD8THX-6:`m?co|q./]"7Z}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:23 CDT 2017]
    WB2LHP>CQ,RS0ISS*,qAR,WA8LMF-SG:=4446.10N\08547.20WS73' Via Satellite {UISS54} [Fri Sep 01 11:53:27 CDT 2017]
    KB8OTK-9>TPSP6P,RS0ISS*,qAR,KD8THX-6:`m?p ^q./]"7[}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:30 CDT 2017]
    KB8OTK-9>TPSP6R,RS0ISS*,qAR,WA8LMF-SG:`m?w |q./]"7\}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:34 CDT 2017]
    N3UPY-9>T1PY4X,RS0ISS*,RS0ISS,qAR,KD8THX-6:`jM}rJL>\`"8u}HELLO VIA PSAT OR ISS N3UPY.SN@GMAIL.COM_% [Fri Sep 01 11:53:39 CDT 2017]
    W4TBD-6>CQ,RS0ISS*,SGATE,FM17DK,qAR,WA8LMF-SG:=/;Tjk:nf_- B73' Via ISS w4tbd@arrl.net FM17dk IGate WLNK-1 [Fri Sep 01 11:53:50 CDT 2017]
    KE0JMK>CQ,RS0ISS*,qAR,KD8THX-6:hi WB4UAH QSL? [Fri Sep 01 11:53:51 CDT 2017]
    K1WY>TQTU7T,RS0ISS*,RS0ISS,qAR,WA8LMF-SG:'dGRl -/] [Fri Sep 01 11:53:53 CDT 2017]
    KB8OTK-9>TPSP6R,RS0ISS*,qAR,KD8THX-6:`m@< hY./]"7O}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:53:57 CDT 2017]
    KA8YES-6>CQ,RS0ISS*,qAR,KD8THX-6:=4022.01N/08032.32W-SatGate EN90ri emt31@emtchunks.net Hello Via ISS [Fri Sep 01 11:53:59 CDT 2017]
    K4KDR-6>CQ,RS0ISS*,qAR,KD8THX-6:=3746.29N/07737.13W`de K4KDR scott23192@gmail.com Virginia FM17es [Fri Sep 01 11:54:04 CDT 2017]
    KB8OTK-9>TPSP6P,RS0ISS*,qAR,KD8THX-6:`m@LorX./]"7I}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:54:08 CDT 2017]
    KB8OTK-9>TPSP5Y,RS0ISS*,qAR,WA8LMF-SG:`m@PnJY./]"7G}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:54:13 CDT 2017]
    KB8OTK-9>TPSP5Y,RS0ISS*,qAR,KD8THX-6:`m@Sl@X./]"7F}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:54:22 CDT 2017]
    W4TBD-6>CQ,RS0ISS*,SGATE,FM17DK,qAR,KD8THX-6:=/;Tjk:nf_- B73' Via ISS w4tbd@arrl.net FM17dk IGate WLNK-1 [Fri Sep 01 11:54:31 CDT 2017]
    K8II>CQ,RS0ISS*,qAR,WA8LMF-SG::K4KDR-6 :QSL in EM79wh Cincinnati, OH Op Fred 73 [UISS]{00 [Fri Sep 01 11:54:33 CDT 2017]
    KB8OTK-9>TPSP5Y,RS0ISS*,qAR,WA8LMF-SG:`m@Sl"[./]"7H}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:54:37 CDT 2017]
    K3RRR>CQ,RS0ISS*,qAR,KD8THX-6:=3903.45N/07712.30Wy 73 de Robert K3RRR Potomac, MD FM19jb [Fri Sep 01 11:54:38 CDT 2017]
    K8II>CQ,RS0ISS*,qAR,KD8THX-6::K4KDR-6 :QSL in EM79wh Cincinnati, OH Op Fred 73 [UISS]{01 [Fri Sep 01 11:54:43 CDT 2017]
    KK4NAM>APRS,RS0ISS*,qAO,W4TBD-10:=3455.70N/08633.53W` EM64rw 73 via ISS [Fri Sep 01 11:54:46 CDT 2017]
    K3RRR>CQ,RS0ISS*,qAR,WA8LMF-SG::Heard :KB8OTK-9,W4TBD-6,K8II,KK4NAM,K1WY,K4KDR-6 [Fri Sep 01 11:55:04 CDT 2017]
    KB8OTK-9>TPSP5U,RS0ISS*,qAR,KK4NAM:`m@v 6Y./]"7<}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:55:09 CDT 2017]
    KB8OTK-9>TPSP5T,RS0ISS*,qAO,W4TBD-10:`m@y 6Y./]"7=}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:55:12 CDT 2017]
    NY2M-6>APRS,RS0ISS*,qAR,WA8LMF-SG:=4036.71N/07410.04W`73' Via Satellite {UISS54} [Fri Sep 01 11:55:19 CDT 2017]
    K8II>CQ,RS0ISS*,qAR,WA8LMF-SG::KB8OTK-9 :QSL in EM79wh Cincinnati, OH Op Fred 73 [UISS]{00 [Fri Sep 01 11:55:21 CDT 2017]
    NY2M-6>APRS,RS0ISS*,qAO,K3RLD-10::Heard :0ISSp-8{UISS54} [Fri Sep 01 11:55:24 CDT 2017]
    KB8OTK-9>TPSP5Q,RS0ISS*,qAO,K3RLD-10:`mA2o^Z./]"7M}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:55:34 CDT 2017]
    KB8OTK-9>TPSP5P,RS0ISS*,qAO,W4TBD-10:`mA8o^]./]"7O}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:55:38 CDT 2017]
    K4KDR-6>CQ,RS0ISS*,qAO,W4TBD-10::KB8OTK-9 :Heard you via ISS in Montpelier, VA FM17es [Fri Sep 01 11:55:41 CDT 2017]
    WU2V>APRS,RS0ISS*,qAO,K3RLD-10:ARISS IGATE FROM THE VOICE OF AMERICA - GREENVILLE NC [Fri Sep 01 11:55:47 CDT 2017]
    K4KDR-6>CQ,RS0ISS*,qAR,KK4NAM::NY2M-6 :Heard you via ISS in Montpelier, VA FM17es [Fri Sep 01 11:55:50 CDT 2017]
    K4KDR-6>CQ,RS0ISS*,qAO,K3RLD-10::W4TBD-6 :Heard you via ISS in Montpelier, VA FM17es [Fri Sep 01 11:55:59 CDT 2017]
    K3RRR>CQ,RS0ISS*,qAO,W4TBD-10::Heard :KB8OTK-9,W4TBD-6,K8II,KK4NAM,K1WY,K4KDR-6,NY2M-6,WU2V [Fri Sep 01 11:56:04 CDT 2017]
    KE4AZZ>CQ,RS0ISS*,qAO,K3RLD-10:=2702.06N/08209.93W`Greetings Earthlings de KE4AZZ el87 [Fri Sep 01 11:56:13 CDT 2017]
    KB8OTK-9>TPSP4Y,RS0ISS*,qAO,K3RLD-10:`mAhnJm./]"7:}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:56:18 CDT 2017]
    N3UPY-9>T1PY1R,RS0ISS*,RS0ISS,qAR,K3RLD-11:`jQ^rTd>\`"9D}HELLO VIA PSAT OR ISS N3UPY.SN@GMAIL.COM_% [Fri Sep 01 11:56:26 CDT 2017]
    WU2V>APRS,RS0ISS*,qAO,W4TBD-10:ARISS IGATE FROM THE VOICE OF AMERICA - GREENVILLE NC [Fri Sep 01 11:56:36 CDT 2017]
    K3RRR>CQ,RS0ISS*,qAO,W4TBD-10::SAT :Greetings from 13 miles from the White House [Fri Sep 01 11:56:36 CDT 2017]
    N3UPY-9>T1PY1S,RS0ISS*,RS0ISS,qAO,K3RLD-10:`jR&rTd>\`"9H}HELLO VIA PSAT OR ISS N3UPY.SN@GMAIL.COM_% [Fri Sep 01 11:56:44 CDT 2017]
    KB8OTK-9>TPSP5Q,RS0ISS*,qAR,N9SIR-1:`mA{m^]./]"7<}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:56:47 CDT 2017]
    K4KDR-6>CQ,RS0ISS*,qAO,K3RLD-10:>K4KDR scott23192@gmail.com SDR/Satcom Telemetry/WxSat RX [Fri Sep 01 11:56:50 CDT 2017]
    K1WY>TQTU7T,RS0ISS*,RS0ISS,qAO,K3RLD-10:'dGRl -/] [Fri Sep 01 11:57:02 CDT 2017]
    W4TBD-6>CQ,RS0ISS*,SGATE,FM17DK,qAR,K3RLD-11:=/;Tjk:nf_- B73' Via ISS w4tbd@arrl.net FM17dk IGate WLNK-1 [Fri Sep 01 11:57:13 CDT 2017]
    K3RRR>CQ,RS0ISS*,qAR,KK4NAM: 73 de Robert K3RRR Potomac, MD FM19jb [Fri Sep 01 11:57:39 CDT 2017]
    NY2M-6>APRS,RS0ISS*,qAR,VE2GQF-2:=4036.71N/07410.04W`73' Via Satellite {UISS54} [Fri Sep 01 11:57:57 CDT 2017]
    KE4AZZ>CQ,RS0ISS*,qAR,VE2GQF-2:=2702.06N/08209.93W`Greetings Earthlings de KE4AZZ el87 [Fri Sep 01 11:57:59 CDT 2017]
    WU2V>APRS,RS0ISS*,qAR,KK4NAM:=3532.47N/07715.70W-ISS IGATE 145.825/437.550 FM15IL [Fri Sep 01 11:58:01 CDT 2017]
    KB8OTK-9>TPSP4W,RS0ISS*,qAR,KK4NAM:`mBBnTf./]"7K}EN90hr FROM CANTON OH VIA ISS= [Fri Sep 01 11:58:25 CDT 2017]
     
  4. K3RLD

    K3RLD Ham Member QRZ Page

    Yeah, now I'm second guessing myself. Had 2 igates going that time. Baofeng + 3/4 wave (no amp) and RTL-SDR + 1/4 wave (no amp). The 3/4 wave (-10) outperformed! And this was a 70° pass.

    :)
     
    AD5KO likes this.
  5. KD6RF

    KD6RF Premium Subscriber QRZ Page

    Not sure if you are using whips or ground-planes, or whatever, but there are lots of variables - how high is the antenna, surrounding clutter, ground conductivity, etc.

    But generally speaking 3/4 wave antennas are not used for low angle work, and will be better at higher angles. Anything longer than around 5/8 wavelength starts throwing lobes up at high angles, so the shorter antennas are generally going to give better low angle coverage.

    (Of course, long co-linear verticals are even better for low angles, but they're not easy or cheap).

    For example, here are 2 M verts, 4 radials, 8 ft high.

    1/4 wave vert gp, 4 radials, 10 ft up
    [​IMG]


    And here is 3/4 wave vert gp, 4 radials, 10 ft up
    [​IMG]

    As said there are lots of variables - even the feedline, if not properly decoupled/choked, will change the radiation pattern.
     
    Last edited: Sep 2, 2017
    AD5KO likes this.
  6. K3RLD

    K3RLD Ham Member QRZ Page

    Yeah, guess I had the conventions swapped. In any case, this is all based on Bob Bruninga's satgate suggestions here:

    http://aprs.org/aprs-satellite-igate-antennas.html

    Both antennas are same height, same house, different ends of the attic.

    I think I may run one or two more tests before I wipe my hands of the experimentation and just let sleeping dogs lie.
     
  7. AD5KO

    AD5KO Ham Member QRZ Page

    Which system worked best?
     
  8. K3RLD

    K3RLD Ham Member QRZ Page

    That last attempt, the 3/4 wave. But previous to that, I had better results with the 1/4.
     
  9. KE8FZT

    KE8FZT Ham Member QRZ Page

    I have had a Satgate running for several weeks now, and finally got 3 or 4 packets to decode.
    I have a 3/4 wave collinear on the roof, 50' of LMR 400 to a Baofeng radio. My other antenna was a 1/4 wave, on a piece of metal, adapter to FM AMP, 25' of RG6 coax to DC power injector, adapter to BNC cable, cable to Baofeng radio. Both of these setup's didnt produce any packets, and when listening I could hardly hear any packets.
    I removed the FM AMP, adapters, Swapped RG6 coax for RG8X BNC coax, didnt hear. Swapped for a Discone antenna in the attic, still nothing on high passes.

    Then I sat through an 80 degree overhead pass, with both baofengs swapped with a Kendwood D72 and Kenwood TH-F6A. Once the ISS was below 30 degrees directly to the East, audio sounded great. The D72 decoded 5 packets, and F6A heard strong signals too.

    The 'Discone -> RG8X Coax -> Kenwood' simple setup has worked the best so far, I was suprised how much a quality radio made a difference.

    The discone will go up to the roof for a couple weeks this weekend, with the same LMR400 and F6A, and I will report back.

    I do have a second TNC to solder together, so I can run comparisons between 2 different antennas...
    -Andrew/KE8FZT
     
  10. K3RLD

    K3RLD Ham Member QRZ Page

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