Re: 10 GHz Beacon project
The 13 dB number was from the sweep provided with the antenna. They were done by an R&S apps guy at a conference a couple of years ago. I suspect that the end cap was not present at the time.
From Tom Holmes, N8ZM
On May 11, 2021, at 7:37 AM, Dana Whitlow via mvus-list mvus-list@lists.febo.com wrote:
Tom, I'm confused now. I thought you said (in a prior email) that the
R.L. at 10.368 GHz was only 13 dB.
Dana
On Mon, May 10, 2021 at 8:26 PM Larry Snyder via mvus-list <
mvus-list@lists.febo.com> wrote:
Mike, I've got a piece of 2" OD plexi tubing, 1/8 wall I can contribute...
On Mon, May 10, 2021 at 9:12 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
Just curious about how to seal the top end of the acrylic tube? I'm
guessing that we cut out s circular piece and glue it in
place.
BTW, I swept the antenna and the S11 dip is a few hundred kHz below
10,368
at -40 dB, but at 368 it is still -30, so not
going to worry about tuning it.
Gedas also was against using PVC.
If we go with the polyurethane foam, which sounds like a cool idea, I'm
not sure about how to fabricate the enclosure. I
looked a the web site link that Trevor sent, but did not what forms it
can
be purchased in; sheets, tubes, ??
Hoke Road does make sense in that regard.
Tom Holmes, N8ZM
-----Original Message-----
From: Mike Suhar via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 7:58 PM
To: Midwest VHF/UHF Society Mailing List mvus-list@lists.febo.com
Cc: Trevor Clarke retrev@csh.rit.edu; Mike Suhar msuhar57@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
From Amazon I found 2" diameter Acrylic in lengths from 12 to 48 inches.
Comments indicate this is a little thin at 1/16". Thinner than I would
want so this probably won't work. Acrylic should be ok with sunlight
for a
few years.
Search on "Source One Deluxe Clear Acrylic Tube 2 Inches Thick" by
Sourceone.org. They say "thick" but they mean diameter.
For other comments, the reason I like Hoke Rd for a location is a clear
shot to the horizon in all directions without any trees. While the
contest
site is higher that won't help when losing several DBs from trees.
Testing from the top floor of the north parking garage at the Greene
would
be a good idea. I can mount it on the trailer hitch mount I use for my
2-foot 10 GHz dish early some morning. Leave it sit there for a few
hours
and see if
Gedes can hear it.
Mike
W8RKO
On Mon, May 10, 2021 at 6:07 PM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:
A useful white paper on various materials and dielectric constant vs
loss
tangent info.
On Mon, May 10, 2021 at 6:05 PM Trevor Clarke retrev@csh.rit.edu
wrote:
The polyurethane they use in the military (and probably commercial
but
that's out of my realm) is a closed cell type that's quite
waterproof.
There's usually a thin PE coating or cover just to make sure. The
stuff
made for radomes is fairly pricey but sometimes distributors will
have
sample sheets a couple of feet in size that would work well for a
small
beacon.
On Mon, May 10, 2021 at 3:49 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
It's WR-90, so nominally 1" x 1/2", but the flange is about 1.75"
square. It's about 10" tall, neglecting the height of the
WG to coax adapter. I am thinking we might mount it through a panel
with
the adapter inside to keep it out of the weather and
close to the TX output port.
I have several fiberglass enclosures that would work nicely to house
the
whole works. Just need to figure out how much volume
is needed to house the system. If K4TO has some suitable bricks, the
space requirement wouldn't be more than maybe one cu-ft.
Mike has a keyer that he has designed, and I have a commercial one
that
could be used instead. There is also a 1 Watt amp
handy. I looked on DEMI's site for something with more power but
didn't
find anything, although they did have a link to
another outfit (Q5?) that I need to check out.
Power supply might be a challenge depending on voltages needed, but
we
can run DC up a coax along with 10 MHz.
Mike has suggested that we start with it on the Englewood water
tower
since we are planning to put other beacons there, then
if it works out OK, we can move it up to the contest station site.
Maybe
as a trial run we do a temporary setup on the
parking garage at The Greene some day when the weather is favorable
for
both being outside and being heard by Gedas over in
Ft. Wayne.
Polyurethane foam sounds good for a radome if it will hold up
outside
in
the sun and such. I think that the slots would need
to be covered with something first. I have heard of PVC pipe being
used,
but I don't know much about it at 10 GHz. I did send
Gedas a note asking his thoughts as he did some extensive testing on
materials about a year ago.
Tom Holmes, N8ZM
-----Original Message-----
From: Randy Midkiff via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 3:18 PM
To: 'Midwest VHF/UHF Society Mailing List' <
Cc: Randy Midkiff ranmid@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
What is the max OD of the ant to be covered?
Randy
-----Original Message-----
From: Tom Holmes via mvus-list [mailto:mvus-list@lists.febo.com]
Sent: Monday, May 10, 2021 3:02 PM
To: 'Midwest VHF/UHF Society Mailing List'
Cc: Tom Holmes
Subject: [mvus-list] 10 GHz Beacon project
I know have in my possession a 12 slot waveguide antenna for the
beacon
project. It has a coax to WG adapter on the bottom.
As is, the S11 dip is -18 dB at about 10.000 GHz, while S11 at
10.368
GHz
is
-13 dB. OK but it could probably be tuned to get
most of that 5 dB where we want it. It came with the top end open,
but a
plate to cover it is included, along with some brass
nuts and screws for a tuning adjustment. A little drilling and
soldering
should take care of that, then I can tune it. Anyone
want to watch? Or supervise?
Will have to figure out a good material for a radome, or maybe just
wrap
it
in Capton tape.
Suggestions?
Tom Holmes, N8ZM
mvus-list mailing list -- mvus-list@lists.febo.com
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--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
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Larry dropped off the 2" tube. Tom, bring the antenna to LWTG on
Wednesday. I will take it and come up with a 3D printed cap and bottom
mount.
Mike
W8RKO
On Tue, May 11, 2021 at 3:03 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
The 13 dB number was from the sweep provided with the antenna. They were
done by an R&S apps guy at a conference a couple of years ago. I suspect
that the end cap was not present at the time.
From Tom Holmes, N8ZM
On May 11, 2021, at 7:37 AM, Dana Whitlow via mvus-list <
mvus-list@lists.febo.com> wrote:
Tom, I'm confused now. I thought you said (in a prior email) that the
R.L. at 10.368 GHz was only 13 dB.
Dana
On Mon, May 10, 2021 at 8:26 PM Larry Snyder via mvus-list <
mvus-list@lists.febo.com> wrote:
Mike, I've got a piece of 2" OD plexi tubing, 1/8 wall I can
contribute...
On Mon, May 10, 2021 at 9:12 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
Just curious about how to seal the top end of the acrylic tube? I'm
guessing that we cut out s circular piece and glue it in
place.
BTW, I swept the antenna and the S11 dip is a few hundred kHz below
10,368
at -40 dB, but at 368 it is still -30, so not
going to worry about tuning it.
Gedas also was against using PVC.
If we go with the polyurethane foam, which sounds like a cool idea, I'm
not sure about how to fabricate the enclosure. I
looked a the web site link that Trevor sent, but did not what forms it
can
be purchased in; sheets, tubes, ??
Hoke Road does make sense in that regard.
Tom Holmes, N8ZM
-----Original Message-----
From: Mike Suhar via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 7:58 PM
To: Midwest VHF/UHF Society Mailing List mvus-list@lists.febo.com
Cc: Trevor Clarke retrev@csh.rit.edu; Mike Suhar <msuhar57@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
From Amazon I found 2" diameter Acrylic in lengths from 12 to 48
inches.
Comments indicate this is a little thin at 1/16". Thinner than I would
want so this probably won't work. Acrylic should be ok with sunlight
for a
few years.
Search on "Source One Deluxe Clear Acrylic Tube 2 Inches Thick" by
Sourceone.org. They say "thick" but they mean diameter.
For other comments, the reason I like Hoke Rd for a location is a clear
shot to the horizon in all directions without any trees. While the
contest
site is higher that won't help when losing several DBs from trees.
Testing from the top floor of the north parking garage at the Greene
would
be a good idea. I can mount it on the trailer hitch mount I use for my
2-foot 10 GHz dish early some morning. Leave it sit there for a few
hours
and see if
Gedes can hear it.
Mike
W8RKO
On Mon, May 10, 2021 at 6:07 PM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:
A useful white paper on various materials and dielectric constant vs
loss
tangent info.
On Mon, May 10, 2021 at 6:05 PM Trevor Clarke retrev@csh.rit.edu
wrote:
The polyurethane they use in the military (and probably commercial
but
that's out of my realm) is a closed cell type that's quite
waterproof.
There's usually a thin PE coating or cover just to make sure. The
stuff
made for radomes is fairly pricey but sometimes distributors will
have
sample sheets a couple of feet in size that would work well for a
small
beacon.
On Mon, May 10, 2021 at 3:49 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
It's WR-90, so nominally 1" x 1/2", but the flange is about 1.75"
square. It's about 10" tall, neglecting the height of the
WG to coax adapter. I am thinking we might mount it through a panel
with
the adapter inside to keep it out of the weather and
close to the TX output port.
I have several fiberglass enclosures that would work nicely to house
the
whole works. Just need to figure out how much volume
is needed to house the system. If K4TO has some suitable bricks, the
space requirement wouldn't be more than maybe one cu-ft.
Mike has a keyer that he has designed, and I have a commercial one
that
could be used instead. There is also a 1 Watt amp
handy. I looked on DEMI's site for something with more power but
didn't
find anything, although they did have a link to
another outfit (Q5?) that I need to check out.
Power supply might be a challenge depending on voltages needed, but
we
can run DC up a coax along with 10 MHz.
Mike has suggested that we start with it on the Englewood water
tower
since we are planning to put other beacons there, then
if it works out OK, we can move it up to the contest station site.
Maybe
as a trial run we do a temporary setup on the
parking garage at The Greene some day when the weather is favorable
for
both being outside and being heard by Gedas over in
Ft. Wayne.
Polyurethane foam sounds good for a radome if it will hold up
outside
in
the sun and such. I think that the slots would need
to be covered with something first. I have heard of PVC pipe being
used,
but I don't know much about it at 10 GHz. I did send
Gedas a note asking his thoughts as he did some extensive testing on
materials about a year ago.
Tom Holmes, N8ZM
-----Original Message-----
From: Randy Midkiff via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 3:18 PM
To: 'Midwest VHF/UHF Society Mailing List' <
Cc: Randy Midkiff ranmid@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
What is the max OD of the ant to be covered?
Randy
-----Original Message-----
From: Tom Holmes via mvus-list [mailto:mvus-list@lists.febo.com]
Sent: Monday, May 10, 2021 3:02 PM
To: 'Midwest VHF/UHF Society Mailing List'
Cc: Tom Holmes
Subject: [mvus-list] 10 GHz Beacon project
I know have in my possession a 12 slot waveguide antenna for the
beacon
project. It has a coax to WG adapter on the bottom.
As is, the S11 dip is -18 dB at about 10.000 GHz, while S11 at
10.368
GHz
is
-13 dB. OK but it could probably be tuned to get
most of that 5 dB where we want it. It came with the top end open,
but a
plate to cover it is included, along with some brass
nuts and screws for a tuning adjustment. A little drilling and
soldering
should take care of that, then I can tune it. Anyone
want to watch? Or supervise?
Will have to figure out a good material for a radome, or maybe just
wrap
it
in Capton tape.
Suggestions?
Tom Holmes, N8ZM
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
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OK. Good progress!
Tom Holmes, N8ZM
-----Original Message-----
From: Mike Suhar via mvus-list mvus-list@lists.febo.com
Sent: Saturday, May 15, 2021 10:46 AM
To: Midwest VHF/UHF Society Mailing List mvus-list@lists.febo.com
Cc: Mike Suhar msuhar57@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
Larry dropped off the 2" tube. Tom, bring the antenna to LWTG on
Wednesday. I will take it and come up with a 3D printed cap and bottom
mount.
Mike
W8RKO
On Tue, May 11, 2021 at 3:03 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
The 13 dB number was from the sweep provided with the antenna. They were
done by an R&S apps guy at a conference a couple of years ago. I suspect
that the end cap was not present at the time.
From Tom Holmes, N8ZM
On May 11, 2021, at 7:37 AM, Dana Whitlow via mvus-list <
mvus-list@lists.febo.com> wrote:
Tom, I'm confused now. I thought you said (in a prior email) that the
R.L. at 10.368 GHz was only 13 dB.
Dana
On Mon, May 10, 2021 at 8:26 PM Larry Snyder via mvus-list <
mvus-list@lists.febo.com> wrote:
Mike, I've got a piece of 2" OD plexi tubing, 1/8 wall I can
contribute...
On Mon, May 10, 2021 at 9:12 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
Just curious about how to seal the top end of the acrylic tube? I'm
guessing that we cut out s circular piece and glue it in
place.
BTW, I swept the antenna and the S11 dip is a few hundred kHz below
10,368
at -40 dB, but at 368 it is still -30, so not
going to worry about tuning it.
Gedas also was against using PVC.
If we go with the polyurethane foam, which sounds like a cool idea, I'm
not sure about how to fabricate the enclosure. I
looked a the web site link that Trevor sent, but did not what forms it
can
be purchased in; sheets, tubes, ??
Hoke Road does make sense in that regard.
Tom Holmes, N8ZM
-----Original Message-----
From: Mike Suhar via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 7:58 PM
To: Midwest VHF/UHF Society Mailing List mvus-list@lists.febo.com
Cc: Trevor Clarke retrev@csh.rit.edu; Mike Suhar <msuhar57@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
From Amazon I found 2" diameter Acrylic in lengths from 12 to 48
inches.
Comments indicate this is a little thin at 1/16". Thinner than I would
want so this probably won't work. Acrylic should be ok with sunlight
for a
few years.
Search on "Source One Deluxe Clear Acrylic Tube 2 Inches Thick" by
Sourceone.org. They say "thick" but they mean diameter.
For other comments, the reason I like Hoke Rd for a location is a clear
shot to the horizon in all directions without any trees. While the
contest
site is higher that won't help when losing several DBs from trees.
Testing from the top floor of the north parking garage at the Greene
would
be a good idea. I can mount it on the trailer hitch mount I use for my
2-foot 10 GHz dish early some morning. Leave it sit there for a few
hours
and see if
Gedes can hear it.
Mike
W8RKO
On Mon, May 10, 2021 at 6:07 PM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:
A useful white paper on various materials and dielectric constant vs
loss
tangent info.
On Mon, May 10, 2021 at 6:05 PM Trevor Clarke retrev@csh.rit.edu
wrote:
The polyurethane they use in the military (and probably commercial
but
that's out of my realm) is a closed cell type that's quite
waterproof.
There's usually a thin PE coating or cover just to make sure. The
stuff
made for radomes is fairly pricey but sometimes distributors will
have
sample sheets a couple of feet in size that would work well for a
small
beacon.
On Mon, May 10, 2021 at 3:49 PM Tom Holmes via mvus-list <
mvus-list@lists.febo.com> wrote:
It's WR-90, so nominally 1" x 1/2", but the flange is about 1.75"
square. It's about 10" tall, neglecting the height of the
WG to coax adapter. I am thinking we might mount it through a panel
with
the adapter inside to keep it out of the weather and
close to the TX output port.
I have several fiberglass enclosures that would work nicely to house
the
whole works. Just need to figure out how much volume
is needed to house the system. If K4TO has some suitable bricks, the
space requirement wouldn't be more than maybe one cu-ft.
Mike has a keyer that he has designed, and I have a commercial one
that
could be used instead. There is also a 1 Watt amp
handy. I looked on DEMI's site for something with more power but
didn't
find anything, although they did have a link to
another outfit (Q5?) that I need to check out.
Power supply might be a challenge depending on voltages needed, but
we
can run DC up a coax along with 10 MHz.
Mike has suggested that we start with it on the Englewood water
tower
since we are planning to put other beacons there, then
if it works out OK, we can move it up to the contest station site.
Maybe
as a trial run we do a temporary setup on the
parking garage at The Greene some day when the weather is favorable
for
both being outside and being heard by Gedas over in
Ft. Wayne.
Polyurethane foam sounds good for a radome if it will hold up
outside
in
the sun and such. I think that the slots would need
to be covered with something first. I have heard of PVC pipe being
used,
but I don't know much about it at 10 GHz. I did send
Gedas a note asking his thoughts as he did some extensive testing on
materials about a year ago.
Tom Holmes, N8ZM
-----Original Message-----
From: Randy Midkiff via mvus-list mvus-list@lists.febo.com
Sent: Monday, May 10, 2021 3:18 PM
To: 'Midwest VHF/UHF Society Mailing List' <
Cc: Randy Midkiff ranmid@gmail.com
Subject: [mvus-list] Re: 10 GHz Beacon project
What is the max OD of the ant to be covered?
Randy
-----Original Message-----
From: Tom Holmes via mvus-list [mailto:mvus-list@lists.febo.com]
Sent: Monday, May 10, 2021 3:02 PM
To: 'Midwest VHF/UHF Society Mailing List'
Cc: Tom Holmes
Subject: [mvus-list] 10 GHz Beacon project
I know have in my possession a 12 slot waveguide antenna for the
beacon
project. It has a coax to WG adapter on the bottom.
As is, the S11 dip is -18 dB at about 10.000 GHz, while S11 at
10.368
GHz
is
-13 dB. OK but it could probably be tuned to get
most of that 5 dB where we want it. It came with the top end open,
but a
plate to cover it is included, along with some brass
nuts and screws for a tuning adjustment. A little drilling and
soldering
should take care of that, then I can tune it. Anyone
want to watch? Or supervise?
Will have to figure out a good material for a radome, or maybe just
wrap
it
in Capton tape.
Suggestions?
Tom Holmes, N8ZM
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
mvus-list mailing list -- mvus-list@lists.febo.com
To unsubscribe send an email to mvus-list-leave@lists.febo.com
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