I have an older orange case SSB2000 model preamp. I used to use it for EME but replaced it and now want to use it in another installation for satellites. I do not however want to power it separately and want to send power down coax with ft847. This does not seem to work and I’m wondering if I need to make some sort of internal change to the preamp. The manual suggests I can power it through the coax. Any thoughts?
Rick, W2JAZ
Have you verified that the 847 is actually sending the 12v up the coax? If so, then I'd look for an open RF choke in the pre-amp. -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd ----------------------------------------------- "Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Fri, Jul 3, 2020 at 12:47 PM Richard Lawn via AMSAT-BB < amsat-bb@amsat.org> wrote:
I have an older orange case SSB2000 model preamp. I used to use it for EME but replaced it and now want to use it in another installation for satellites. I do not however want to power it separately and want to send power down coax with ft847. This does not seem to work and I’m wondering if I need to make some sort of internal change to the preamp. The manual suggests I can power it through the coax. Any thoughts?
Rick, W2JAZ
Sent from Gmail Mobile _______________________________________________ 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: https://www.amsat.org/mailman/listinfo/amsat-bb
Another question - do you have a brick amplifier inline? If yes, make sure the amp passes DC. Some - like Teletec - are DC blocked.
On 7/3/2020 1:52 PM, Mark Johns, K0JM via AMSAT-BB wrote:
Have you verified that the 847 is actually sending the 12v up the coax? If so, then I'd look for an open RF choke in the pre-amp. -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd
"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Fri, Jul 3, 2020 at 12:47 PM Richard Lawn via AMSAT-BB < amsat-bb@amsat.org> wrote:
I have an older orange case SSB2000 model preamp. I used to use it for EME but replaced it and now want to use it in another installation for satellites. I do not however want to power it separately and want to send power down coax with ft847. This does not seem to work and I’m wondering if I need to make some sort of internal change to the preamp. The manual suggests I can power it through the coax. Any thoughts?
Rick, W2JAZ
Sent from Gmail Mobile _______________________________________________ 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: https://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: https://www.amsat.org/mailman/listinfo/amsat-bb
Need to verify there really is 12 going down coax. Menu item is set correctly. Not using any external amp. I’ll get back when I verify the coax voltage
On Fri, Jul 3, 2020 at 2:24 PM Mike Seguin n1jez@burlingtontelecom.net wrote:
Another question - do you have a brick amplifier inline? If yes, make sure the amp passes DC. Some - like Teletec - are DC blocked.
On 7/3/2020 1:52 PM, Mark Johns, K0JM via AMSAT-BB wrote:
Have you verified that the 847 is actually sending the 12v up the coax?
If
so, then I'd look for an open RF choke in the pre-amp.
Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd
"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Fri, Jul 3, 2020 at 12:47 PM Richard Lawn via AMSAT-BB < amsat-bb@amsat.org> wrote:
I have an older orange case SSB2000 model preamp. I used to use it for
EME
but replaced it and now want to use it in another installation for satellites. I do not however want to power it separately and want to
send
power down coax with ft847. This does not seem to work and I’m
wondering if
I need to make some sort of internal change to the preamp. The manual suggests I can power it through the coax. Any thoughts?
Rick, W2JAZ
Sent from Gmail Mobile _______________________________________________ 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: https://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: https://www.amsat.org/mailman/listinfo/amsat-bb
--
73, Mike, N1JEZ "A closed mouth gathers no feet"
Lightning arresters also often block DC.
Greg KO6TH
Richard Lawn via AMSAT-BB wrote:
Need to verify there really is 12 going down coax. Menu item is set correctly. Not using any external amp. I’ll get back when I verify the coax voltage
participants (4)
-
Greg D -
Mark Johns, K0JM -
Mike Seguin -
Richard Lawn