duplexer used as a filter
I'm trying to setup a remote sat station and need help with a desence filter. I was using a Diamond MX72-n and was experiencing water intrusion. I then checked the archives and consulted the group and went to the recommended Comet CF-416. Guess what, I'm still getting water into the duplexer. I thought that it was more suited to outdoor service on the recommendation of the group. So, before I take apart one of the duplexers to attempt to waterproof, does anyone know of a duplexer that is designed for outdoor use on the tower? I really don't have the room for a 12 foot + crossboom, so I need to resolve the desence with the duplexer. Any suggestions from someone who has solved this?
73 Jeff kb2m
None of the commercially made duplexers that I know of are made for outdoor service. Use the top half of a milk jug, run the cable through the top and seal off the top of the jug. Put the duplexer inside. using the top half of the jug as a rain shield.
That should keep 95% of the rain out of the duplexer.
73,
Paul, N8HM
On Mon, Jul 27, 2015 at 8:38 PM, kb2m@arrl.net wrote:
I'm trying to setup a remote sat station and need help with a desence filter. I was using a Diamond MX72-n and was experiencing water intrusion. I then checked the archives and consulted the group and went to the recommended Comet CF-416. Guess what, I'm still getting water into the duplexer. I thought that it was more suited to outdoor service on the recommendation of the group. So, before I take apart one of the duplexers to attempt to waterproof, does anyone know of a duplexer that is designed for outdoor use on the tower? I really don't have the room for a 12 foot + crossboom, so I need to resolve the desence with the duplexer. Any suggestions from someone who has solved this?
73 Jeff kb2m
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Not a bad Idea, Paul. Although some duct tape on the bottom of the jug should keep out any further moisture. Also a bit of spray paint on the jug as well wouldn't hurt to protect from UV damage. That thin plastic wouldn't last long on its own.
73, Josh KJ4VYR
On Mon, Jul 27, 2015 at 8:47 PM, Paul Stoetzer n8hm@arrl.net wrote:
None of the commercially made duplexers that I know of are made for outdoor service. Use the top half of a milk jug, run the cable through the top and seal off the top of the jug. Put the duplexer inside. using the top half of the jug as a rain shield.
That should keep 95% of the rain out of the duplexer.
73,
Paul, N8HM
On Mon, Jul 27, 2015 at 8:38 PM, kb2m@arrl.net wrote:
I'm trying to setup a remote sat station and need help with a desence filter. I was using a Diamond MX72-n and was experiencing water
intrusion.
I then checked the archives and consulted the group and went to the recommended Comet CF-416. Guess what, I'm still getting water into the duplexer. I thought that it was more suited to outdoor service on the recommendation of the group. So, before I take apart one of the
duplexers to
attempt to waterproof, does anyone know of a duplexer that is designed
for
outdoor use on the tower? I really don't have the room for a 12 foot + crossboom, so I need to resolve the desence with the duplexer. Any suggestions from someone who has solved this?
73 Jeff kb2m
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
Its probably not rain. Its probably condensation!
This will ALWAYS happen unless it is hermetically sealed and that is near impossible. DUring the day, hot moist air stabilizes inside and outside. At night the cooler temperatures will cause the mostirue inside to condense. Every day the cycle continunes. Water builds up to failured.
And that is why such things are placed in at least mildly tmperature controlled environments. Also, do not foget that night-sky radiative cooling of anything that can see the sky will cool below ambient and make condensation even worse.
Bob, Wb4aPR
On Mon, Jul 27, 2015 at 9:07 PM, Joshua Abraham jarvideo@gmail.com wrote:
Not a bad Idea, Paul. Although some duct tape on the bottom of the jug should keep out any further moisture. Also a bit of spray paint on the jug as well wouldn't hurt to protect from UV damage. That thin plastic wouldn't last long on its own.
73, Josh KJ4VYR
On Mon, Jul 27, 2015 at 8:47 PM, Paul Stoetzer n8hm@arrl.net wrote:
None of the commercially made duplexers that I know of are made for outdoor service. Use the top half of a milk jug, run the cable through the top and seal off the top of the jug. Put the duplexer inside. using the top half of the jug as a rain shield.
That should keep 95% of the rain out of the duplexer.
73,
Paul, N8HM
On Mon, Jul 27, 2015 at 8:38 PM, kb2m@arrl.net wrote:
I'm trying to setup a remote sat station and need help with a desence filter. I was using a Diamond MX72-n and was experiencing water
intrusion.
I then checked the archives and consulted the group and went to the recommended Comet CF-416. Guess what, I'm still getting water into the duplexer. I thought that it was more suited to outdoor service on the recommendation of the group. So, before I take apart one of the
duplexers to
attempt to waterproof, does anyone know of a duplexer that is designed
for
outdoor use on the tower? I really don't have the room for a 12 foot + crossboom, so I need to resolve the desence with the duplexer. Any suggestions from someone who has solved this?
73 Jeff kb2m
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
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
Jeff,
I have used a CF-416 for years with no problem. I wrap it with several turns of bubble wrap, and secure those with tape or cable ties. I then wrap that with heavy duty aluminum foil, several turns, and also secure that. Finally, the top cable is wrapped with several turns of tape sealing the junction of cable and foil to prevent water from running down under the foil. Every 2 years I crack it open to check it, and replace the sealing material. So far it has kept the rain out, and prevented condensation accumulation.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of kb2m@arrl.net <Sent: Monday, July 27, 2015 7:38 PM <To: 'amsat bb' amsat-bb@amsat.org <Subject: [amsat-bb] duplexer used as a filter < <I'm trying to setup a remote sat station and need help with a desence <filter. I was using a Diamond MX72-n and was experiencing water intrusion. <I then checked the archives and consulted the group and went to the <recommended Comet CF-416. Guess what, I'm still getting water into the <duplexer. I thought that it was more suited to outdoor service on the <recommendation of the group. So, before I take apart one of the duplexers to <attempt to waterproof, does anyone know of a duplexer that is designed for <outdoor use on the tower? I really don't have the room for a 12 foot + <crossboom, so I need to resolve the desence with the duplexer. Any <suggestions from someone who has solved this? < < < <73 Jeff kb2m < < < <_______________________________________________ <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
I got a bunch of replies from the group. I thank you all for that. As there doesn't appear to be a weatherproof duplexer available I ended up taking the duplexer apart then sealing all openings airtight with silicone leaving a small hole on the bottom side, the dual lead side. Several suggested some kind of enclosure I didn't want to go that route as it would just make another home for the local flying critters. I was also told that it wasn't water but condensation, I don't think so as both duplexers were completely full of water, you would think both ends would pass water equally but it appears that the connector end as opposed to the lead end is the culprit as the water would get in but then not drain out Another interesting comment was that there is no weatherproof amateur radio equipment suitable to leave outdoors, my Landwehr preamps have been outdoors in the open for over 18 years and their doing fine. When I recently moved them to my new QTH all the markings on them were gone, I had to open one up to positively identify the 2m vs 70cm one. Inside was dry as a bone and no corrosion or rust. :-)
Still looking for someone who has successfully got full duplex remote sat ops working.......
73 Jeff kb2m
I'm trying to setup a remote sat station and need help with a desence filter. I was using a Diamond MX72-n and was experiencing water intrusion. I then checked the archives and consulted the group and went to the recommended Comet CF-416. Guess what, I'm still getting water into the duplexer. I thought that it was more suited to outdoor service on the recommendation of the group. So, before I take apart one of the duplexers to attempt to waterproof, does anyone know of a duplexer that is designed for outdoor use on the tower? I really don't have the room for a 12 foot + crossboom, so I need to resolve the desence with the duplexer. Any suggestions from someone who has solved this?
73 Jeff kb2m
participants (5)
-
Alan -
Joshua Abraham -
kb2m＠arrl.net -
Paul Stoetzer -
Robert Bruninga