A simple to test alternative that could atenuate over 40 db on 88-108 MHz, will be a quarter wave open stub made using 50cm of RG-58 on the feedline.
73, lu7abf, Pedro
On 1/8/23, Wendy and Terry Osborne via AMSAT-BB amsat-bb@amsat.org wrote:
You could buy one of these: http://www.rtl-sdr.com/rtl-sdr-com-broadcast-fm-band-stop-filter-88-108-mhz-...
to remove any problems with high power FM transmitters.
73, Terry Osborne ZL2BAC
On 9/01/2023 3:36 pm, Robert McGwier via AMSAT-BB wrote:
You are going to run into serious trouble if you live near high power transmitters, especially FM. The front end of the RTL-SDR has poor large signal handling capabilities.
Bob N4HY
On Thu, Dec 29, 2022 at 5:08 PM James Hickox via AMSAT-BB amsat-bb@amsat.org wrote:
Hello. After many years away, I am beginning to get a shack ready to start using the satellites again. This time, I cannot go with the best hardware and will.need to do some compromises. I played with the SDR dongles awhile back and used one of the $20 wideband preamps. My question: if I were to set the preamp up with a diplexer as an input filter and 50 ohm terminations for protection along with the proper relays, could this preamp be useful if mounted near the antenna feed point? I cannot seem to find out any comparisons or testing against other homebrew or commercial units. Thanks and 73, James, AA5AO ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org <http://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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org <http://amsat.org> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org-- Dr. Robert W McGwier, Ph.D. Adjunct Faculty, Virginia Tech Affiliated Faculty, University of Scranton ARDC Member of Board N4HY: ARRL, TAPR, AMSAT, EARC, CSVHFS Sky: AAVSO, Sky360, explorescu.org http://explorescu.org, Skyscrapers
Sent via AMSAT-BB(a)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. Acceptable Use and Privacy Policies available athttps://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org