Re: Looking for advice on antenna placement for our radio club repeaters.
You really should consider Heliax over Superflex.
All the Best & 7 3s
Dale Miller, KC2CBD
Cookeville, Tennessee
Putnam County TN ARES
Emergency Coordinator
Vice President Cookeville Repeater Association
Ham Operator since 1997 (Extra)
stpatrick2@...
Registered Linux User: #317401
Linux since June 2003
Registered Ubuntu User #26423
--
On 5/7/2025 9:03 AM, Dale KB9JJA via
groups.io wrote:
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I will see if I can find something else at Dayton for the
GMRS antenna. I purchased the CA-712EFC
based on recommendations of people using it in repeater
service. We found out about the LMR-400 braid issue in
repeater service too late, that is the main reason we are
moving to superflex!?
|
Re: Looking for advice on antenna placement for our radio club repeaters.
That may be so Milton but I've had half inch superflex running to my HF and VHF antennas for over 4 years without any issues.. if it can stand the Texas heat it can stand anything LOL
Chris WB5ITT?
Superflex is not intended to be used for exterior antenna runs.? It was developed for interior cabling in shelters and racks where tighter bends were needed. Use regular Heliax for exterior runs.
Milt N3LTQ ? If you can't find a DB408 / DB420, a similar one to the 712EFC would be the Comet GP-6 which will have a tiny bit less gain, but none of the desense issues.?? But the 408 or 420 will still beat it as far as signal to the horizon.
Andy Regarding “superflex,” unless you have this available/on hand, you may want to consider plain Heliax instead, as it is cheaper and offers lower loss. ? Matt AL0R ? From: [email protected] <[email protected]> On Behalf Of Dale KB9JJA via
Sent: Wednesday, May 7, 2025 09:04
To: [email protected]
Subject: Re: [repeater-builder] Looking for advice on antenna placement for our radio club repeaters. ? I will see if I can find something else at Dayton for the GMRS antenna. I purchased the CA-712EFC based on recommendations of people using it in repeater service. We found out about the LMR-400 braid issue in repeater service too late, that is the main reason we are moving to superflex!?
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Re: mobile antenna on the side windows???
Consider a trunk lip mount. ?I have used these on hoods and trunks as well as some other locations. ?
Milt N3LTQ
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On May 7, 2025, at 14:04, n9wys <n9wys@...> wrote:
?Roger and Gervais,
I used a Larsen glass mount on my wife's 2001 Cadillac STS, until we had to replace the rear glass... Like Roger noted, the new glass must have been of a different "mix", as I could never get a good match with the antenna after replacement.? You'll also have to avoid the defrosted grid if there's one on/in the glass.
YMMV
Mark - N9WYS? On Wed, May 7, 2025 at 12:35, Gervais Fillion via groups.io <ve2ckn2@...> wrote:
yes roger,i think i have a special place on the side windows for that ,,it is molded in the glass or it was on the rear windo,,
i will check
thanks
Gef
Use caution with glass mounts.
Some vehicles have a high metal content in the window tint that seriously degrades performance.
Roger
On 5/7/2025 10:24 AM, Gervais Fillion via groups.io wrote:
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: Looking for advice on antenna placement for our radio club repeaters.
Superflex is not intended to be used for exterior antenna runs. ?It was developed for interior cabling in shelters and racks where tighter bends were needed. Use regular Heliax for exterior runs.
Milt N3LTQ
toggle quoted message
Show quoted text
On May 7, 2025, at 12:12, wj9jrg via groups.io <wj9jrg@...> wrote:
? If you can't find a DB408 / DB420, a similar one to the 712EFC would be the Comet GP-6 which will have a tiny bit less gain, but none of the desense issues.?? But the 408 or 420 will still beat it as far as signal to the horizon.
Andy Regarding “superflex,” unless you have this available/on hand, you may want to consider plain Heliax instead, as it is cheaper and offers lower loss. ? Matt AL0R ? From: [email protected] <[email protected]> On Behalf Of Dale KB9JJA via
Sent: Wednesday, May 7, 2025 09:04
To: [email protected]
Subject: Re: [repeater-builder] Looking for advice on antenna placement for our radio club repeaters. ? I will see if I can find something else at Dayton for the GMRS antenna. I purchased the CA-712EFC based on recommendations of people using it in repeater service. We found out about the LMR-400 braid issue in repeater service too late, that is the main reason we are moving to superflex!?
|
Re: mobile antenna on the side windows???
Roger and Gervais,
I used a Larsen glass mount on my wife's 2001 Cadillac STS, until we had to replace the rear glass... Like Roger noted, the new glass must have been of a different "mix", as I could never get a good match with the antenna after replacement.? You'll also have to avoid the defrosted grid if there's one on/in the glass.
YMMV
On Wed, May 7, 2025 at 12:35, Gervais Fillion via groups.io <ve2ckn2@...> wrote:
yes roger,i think i have a special place on the side windows for that ,,it is molded in the glass or it was on the rear windo,,
i will check
thanks
Gef
Use caution with glass mounts.
Some vehicles have a high metal content in the window tint that seriously degrades performance.
Roger
On 5/7/2025 10:24 AM, Gervais Fillion via groups.io wrote:
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: mobile antenna on the side windows???
yes roger,i think i have a special place on the side windows for that ,,it is molded in the glass or it was on the rear windo,,
i will check
thanks
Gef
Use caution with glass mounts.
Some vehicles have a high metal content in the window tint that seriously degrades performance.
Roger
On 5/7/2025 10:24 AM, Gervais Fillion via groups.io wrote:
toggle quoted message
Show quoted text
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: mobile antenna on the side windows???
ahh
way over my "retired man " budget andy,
250$ here at Radioworld.ca.
des voleurs,,,,
way to much for me
gervais
I don't often use a glass mount antenna ... but when I do, I use the Larsen Dual band glass mount.?? Like this one:?
Larsen Dualband Glass Mount Antenna 2m/70cm - KG2-70CXPL
Andy
On Wed, May 7, 2025 at 11:24?AM Gervais Fillion via
<ve2ckn2= [email protected]> wrote:
toggle quoted message
Show quoted text
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: Multi-Bay Folded Dipole for 70cm
Hi Dale,
?
Building say a 4 bay UHf array is not going to be as easy as purchasing one, (say DB products) used, and remaking the harness for your frequency, as was already stated. It may not be cheap either, but it is something that can be done. I have built a number of 6M vertical antennas for fun. If that is what you really wish to do.
?
There are 2 basic dipole element designs. The simplest is a fed (usually upper) loop with lower loop grounded on both sides to the center mast. The other is a true folded dipole that is balance fed to both upper and lower folded diploe halves. The first type requires the dipole to be close in to the tower leg or mast, and the second requires the folded dipole out almost 1/4 wave from the tower leg or mast. There is much greater SWR bandwidth with the balanced feed, but it is also more directional, so it would require 2 elements on opposite sides at the same level to give more of an omni pattern. The second type also requires a series 1/4 wavelength of 125 ohm coax inside the element tubing to match the element to 50 ohm feedpoint.
?
This is roughly what would be involved for the simpler type. I recommend aluminum rod instead of copper tubing say 1/4-3/8" OD rod. Commercially they use tubing, but a rod is easier to place the end bends without needing a bending device to prevent kinking. Ideally find someone that does TIG or Heliarc welding to join the loops to say a 1"-1 1/4" OD square horizontal aluminum tube in the center of the 1/2 wave folded dipole element that will fasten to a tower leg or mast. The distance between the loop and tower leg or mast is critical so that would have to be trial and error for 50 ohm feedpoint match. Your element would be an electrical 1/4 wave usually fed between one side of the? upper 1/4 wave loop and the horizontal center? square tubing, where the coax cable passes from element to tower leg or mast inside the s to the bottom tip.quare tubing.?
?
For 445 MHz, 1/2 wavelength is 13 inches, so quessing at the dimensions,? the upper loop needs to be this long from where the coax shield ends to where the return loop joins the square tubing. If the coax comes out the far end of the square tubing where the shield is grounded will then need to be 13 inches, so about 5 1/2 inches from the shield ground point to the upper loop tip top, if the loop space is 1 3/4 inches C-C between element sides..? ?The lower loop may need to be slightly shorter. Minimum of 3/4 wavelength vertical spacing C-C between dipoles vertically.?
?
I am sure others may add or actually disagree with my comments, but this is at least a starter.
?
John
? ? ? On 05/06/2025 12:03 PM EDT Dale O'Neill via groups.io <djoneill63@...> wrote:
?
?
Greetings everyone,
?
I am new to the group and looking for help on constructing a multi-bay 70cm antenna for our repeater.?
I am thinking of using copper pipe for durability.
I have looked in all of my antenna books but they are not helping.
Does anyone have plans or information for such a project that would get me started.
?
Thanks in advance,
Dale?
N3DJO
|
Re: FS: thin client computers for DOS radio programming
I May be interested but can we see specs on this device??
I recently sold five of these and found I still have a bunch more of these little machines.
I have one myself I use with freeDoS on a USB thumb drive with all the DOS based RSS, GE, etc and it just works.
The thumb drive files can be accessed on a newer machine where you can backup or add more DOS programs.
These thin-clients have a REAL serial port. And are 12V!?
Setup isn't hard or seriously involved. I'll post a YouTube video and send a link to buyers.
Instead of back and fourth on shipping, $45 for medium flat rate box Priority Mail, CONUS. Contact for AK, HI, and international.
Computer only.
|
Re: FS: thin client computers for DOS radio programming
picture ? or make and model ?
I recently sold five of these and found I still have a bunch more of these little machines.
I have one myself I use with freeDoS on a USB thumb drive with all the DOS based RSS, GE, etc and it just works.
The thumb drive files can be accessed on a newer machine where you can backup or add more DOS programs.
These thin-clients have a REAL serial port. And are 12V!?
Setup isn't hard or seriously involved. I'll post a YouTube video and send a link to buyers.
Instead of back and fourth on shipping, $45 for medium flat rate box Priority Mail, CONUS. Contact for AK, HI, and international.
Computer only.
-- John Kreno
The line separating good and evil passes not through states, nor between classes, nor between political parties either—but right through every human heart—and through all human hearts. This line shifts. Inside us, it oscillates with the years. And even within hearts overwhelmed by evil, one small bridgehead of good is retained. And even in the best of all hearts, there remains … an unuprooted small corner of evil. - Aleksandr Solzhenitsyn
|
FS: thin client computers for DOS radio programming
I recently sold five of these and found I still have a bunch more of these little machines.
I have one myself I use with freeDoS on a USB thumb drive with all the DOS based RSS, GE, etc and it just works.
The thumb drive files can be accessed on a newer machine where you can backup or add more DOS programs.
These thin-clients have a REAL serial port. And are 12V!?
Setup isn't hard or seriously involved. I'll post a YouTube video and send a link to buyers.
Instead of back and fourth on shipping, $45 for medium flat rate box Priority Mail, CONUS. Contact for AK, HI, and international.
Computer only.
|
Re: mobile antenna on the side windows???
Use caution with glass mounts.
Some vehicles have a high metal content in the window tint that
seriously degrades performance.
Roger
On 5/7/2025 10:24 AM, Gervais Fillion
via groups.io wrote:
toggle quoted message
Show quoted text
hello everyone,
i just baught a new vehicule and i dont want to make an hole on
the top,,but decades ago i used one of those side mount antenna
that were fixed in place with a very sticky tape from 3M if i
remember.
i need one now but i dont want to pay to much but something
good,my repeater are well located around.i will use max 20-25
watts.
would you have a couple of suggestions,i am sure many have used
some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: Looking for advice on antenna placement for our radio club repeaters.
If you can't find a DB408 / DB420, a similar one to the 712EFC would be the Comet GP-6 which will have a tiny bit less gain, but none of the desense issues.?? But the 408 or 420 will still beat it as far as signal to the horizon.
Andy
Regarding “superflex,” unless you have this available/on hand, you may want to consider plain Heliax instead, as it is cheaper and offers lower loss. ? Matt AL0R ? From: [email protected] <[email protected]> On Behalf Of Dale KB9JJA via
Sent: Wednesday, May 7, 2025 09:04
To: [email protected]
Subject: Re: [repeater-builder] Looking for advice on antenna placement for our radio club repeaters. ? I will see if I can find something else at Dayton for the GMRS antenna. I purchased the CA-712EFC based on recommendations of people using it in repeater service. We found out about the LMR-400 braid issue in repeater service too late, that is the main reason we are moving to superflex!?
|
Re: mobile antenna on the side windows???
I don't often use a glass mount antenna ... but when I do, I use the Larsen Dual band glass mount.?? Like this one:?
Larsen Dualband Glass Mount Antenna 2m/70cm - KG2-70CXPL
Andy
On Wed, May 7, 2025 at 11:24?AM Gervais Fillion via <ve2ckn2= [email protected]> wrote:
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: Looking for advice on antenna placement for our radio club repeaters.
At 5/7/2025 07:27 AM, you wrote:
It makes a great base antenna.?
?? But yeah, I have one too I would let go for $50 that's brand new.
(as in never installed outside).? ?? I made the same mistake,
because my intent was also repeater (25 years ago).? ?? So don't
feel bad.? ?? Live and learn.? ?? And yes, it could work for a
while or at low power, or if not using a preamp.??
Andy
My friend bought a CA-712 for his 25 watt repeater with no preamp: 3 to 4
dB of desense.
Bob NO6B
|
Re: Looking for advice on antenna placement for our radio club repeaters.
At 5/7/2025 07:03 AM, you wrote:
I will see if I can find
something else at Dayton for the GMRS antenna. I purchased the CA-712EFC
based on recommendations of people using it in repeater service. We found
out about the LMR-400 braid issue in repeater service too late, that is
the main reason we are moving to superflex!
A friend of mine bought one of these to put on his 440 repeater: 3 to 4
dB of desense from a brand new antenna.? Replaced it with a GP-9N:
no desense.
Bob NO6B
|
Re: mobile antenna on the side windows???
interesting,i will check !
i also search for your experiences on certain model,sometime buying the most costly will not mean best performance but great marketing!!
thanks
gervais ve2ckn
Search Google for "glass mount dual band antenna" prices range from poor quality $30 to top quality $153.
toggle quoted message
Show quoted text
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: mobile antenna on the side windows???
Search Google for "glass mount dual band antenna" prices range from poor quality $30 to top quality $153.
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
mobile antenna on the side windows???
hello everyone,
i just baught a new vehicule and i dont want to make an hole on the top,,but decades ago i used one of those side mount antenna that were fixed in place with a very sticky tape from 3M if i remember.
i need one now but i dont want to pay to much but something good,my repeater are well located around.i will use max 20-25 watts.
would you have a couple of suggestions,i am sure many have used some model.
thanks in advance for your guidance.
73?
gervais,ve2ckn
|
Re: Looking for advice on antenna placement for our radio club repeaters.
Regarding “superflex,” unless you have this available/on hand, you may want to consider plain Heliax instead, as it is cheaper and offers lower loss. ? Matt AL0R ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Dale KB9JJA via groups.io
Sent: Wednesday, May 7, 2025 09:04
To: [email protected]
Subject: Re: [repeater-builder] Looking for advice on antenna placement for our radio club repeaters. ? I will see if I can find something else at Dayton for the GMRS antenna. I purchased the CA-712EFC based on recommendations of people using it in repeater service. We found out about the LMR-400 braid issue in repeater service too late, that is the main reason we are moving to superflex!?
|
Dale Miller - KC2CBD
Chris Boone WB5ITT
n9wys
Gervais Fillion
Seth Lavinder W8FG
KB9LFZ