Keep in mind that ANY omni antenna is going to be pretty dismal on receiving satellites. So although there are some differences, we talking about total crap or only partially crap. Based on my own experiences with a couple of different omni antennas, as I recall a few years back when I was trying to pass decoded packets from the original PC-Sat (if I remember right), the best I could do was a couple of decoded packets per week. Between the weak signal and no automated dopler shift, it was pretty much wasted effort. One thing going against me is that I live in the very RF congested Los Angeles basin, so that may have been working against me.

73 ----- Jim Walls - K6CCC jim@k6ccc.org

-----Original Message----- From: "Brad Brooks" brad.wf7t@gmail.com Sent: Monday, April 2, 2018 09:33 To: amsat-bb@amsat.org Subject: Re: [amsat-bb] Lindenblad or DCA???

Roland, many thanks for the awesome work! Very informative...73 Brad WF7T

On Apr 2, 2018, 11:28 AM -0500, Roland Zurmely via AMSAT-BB amsat-bb@amsat.org, wrote:

See here comparison of 4 omnidirectional antennas: DCA, Lindenblad, turnstile and QFH: <http://www.qsl.net/py4zbz/4ant.htm 73 de Roland PY4ZBX _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Bob, when you say "big ground plane", how big is "big"? If you have a link to the appropriate webpage on your APRS site, that would be great.

Thanks!

Steve AI9IN

On 2018-04-02 13:02, Robert Bruninga wrote:

Great plots... Now add a 1/4 wave monopole plot. It has a null straight up, but the time any satellite is in that null is less than 5% of the time, and at those higher elevations, the satellite is 10 dB stronger anyway. So the impact is minimal... And it has a smooth response without all those nulls of the others... And include a 3/4 wave vertical plot and pick up another 2 dBi... above 30 deg.

-----Original Message----- From: Roland Zurmely via AMSAT-BB Sent: Monday, April 02, 2018 12:28 PM Subject: [amsat-bb] Lindenblad or DCA???

See here comparison of 4 omnidirectional antennas: DCA, Lindenblad, turnstile and QFH: http://www.qsl.net/py4zbz/4ant.htm 73 de Roland PY4ZBX _______________________________________________