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!?
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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
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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
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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
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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.
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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!?
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Looking for Service Manual for the Midland 91-1110B Repeater.
?
Any help would be appreciated.
?
Thank you
?
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Re: Looking for advice on antenna placement for our radio club repeaters.
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
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.
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: Looking for advice on antenna placement for our radio club repeaters.
I would strongly suggest against getting the Hustler G6 dual band antenna. We purchased one back about 2018 and it was great, we¡¯ve purchased three more since then and they were each progressively worse. The last one had the lowest SWR of 1.7:1 at 147.8 MHz. Their quality has gone downhill. ?Hustler, Customer Service was absolutely no help. We were able to return the last one.
Mike, W0IH
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Re: Looking for advice on antenna placement for our radio club repeaters.
If tuned incorrectly,? they could go spurious especially the UHFs...
But I had no problems with mine...iirc the 146.68 UTMB Galveston is still a SCR1000 on the air
Chris
At 5/6/2025 06:31 AM, you wrote:
A Spectrum SCR 1000! Glad to see
it's still chugging along. I knew Joe DeCorsella , I think I spelled that
right, from there start in the '70s. I have an S7R on 220 myself but I've
got to recrystal it for my new pair.. same RF boards anyway. Tuned up
properly they just work.
Wasn't their slogan "They work everywhere" (referring to the
frequency domain, hence why they're called Spectrum)?
We had a 2 meter Spectrum in the LA area go wildly spurious in the LO
chain. It was hilarious to key up all over the band to see where it was
RXing at any given time.
?Always has
great audio!
IMHO that was their only redeeming quality.
Bob NO6B
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Re: FS: Spectrum SCR77 2 meter repeater
SOLD.....
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On 5/6/2025 12:30 PM, Joe wrote: 146.775TX, 146.175RX, PL 110.9, AC power supply built-in.
The receiver is working, transmitter not working but I can hear a weak carrier on 146.775. Included is a spare parts receiver crystaled for 147.405RX.
This is definitely a project repeater.? Cleaning out the basement.
$50 OBO (don't worry you won't offend me) plus shipping from 06423.
73, Joe, K1ike
k1ike@...
860-883-5545
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Re: Looking for advice on antenna placement for our radio club repeaters.
At 5/6/2025 06:31 AM, you wrote:
A Spectrum SCR 1000! Glad to see
it's still chugging along. I knew Joe DeCorsella , I think I spelled that
right, from there start in the '70s. I have an S7R on 220 myself but I've
got to recrystal it for my new pair.. same RF boards anyway. Tuned up
properly they just work.
Wasn't their slogan "They work everywhere" (referring to the
frequency domain, hence why they're called Spectrum)?
We had a 2 meter Spectrum in the LA area go wildly spurious in the LO
chain. It was hilarious to key up all over the band to see where it was
RXing at any given time.
?Always has
great audio!
IMHO that was their only redeeming quality.
Bob NO6B
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Re: Multi-Bay Folded Dipole for 70cm
Save your self the headache and time. Buy a commercialy made antenna. I like the Telewave ANT-450 or the Sinclair. Sinclair all the cable if is internal. Telewave it is external. If you deal with ice the black telewave hold up better. Both can be order with downtilt. I wouldn¡¯t go more than 6 degrees DT. I have the Telewave two bay version on my mountain top sites I. The Sierra Nevada mountains for 15 years no issues.?
They work well for combined systems 420-470 MHz. I have amatuer, GMRS and commercial repeaters all on two antennas. ?Saves money and time when adding more repeaters later.?
My .02
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On May 6, 2025, at 11:05?AM, Chad Nelson <chad.nelson71@...> wrote:
? I agree with this assessment of the 420. We have a DB 420, 16 Bay UHF on 440.950 and like Dave says, it really screams! Tower is 60 feet with a 20 foot antenna and people think the tower is at least 150 feet. Chad Nelson WI9HF/WRPL979 Janesville Wisconsin 608-754-8671 Send from my spectrum iPhone 16. On May 6, 2025, at 12:53?PM, Dave Bates via groups.io <Kf0xq1@...> wrote:
? I'm assuming this is an amateur repeater ? There are some used 408s, 404s, and if you want to go top shelf, some 420s online?for sale.? You just have to hunt for them ...? ?I paid $250 for our DB-420B.? Though it's cut for 450-470, It has plenty of sweep into the amateur 440 band.? ?Ours is on 444.000+ .... 1.5 to 1 SWR.? It really "screams" !! 40 mile range depending on topography. On Tue, May 6, 2025 at 11:07?AM Dale O'Neill via <djoneill63= [email protected]> 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
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Re: Multi-Bay Folded Dipole for 70cm
I agree with this assessment of the 420. We have a DB 420, 16 Bay UHF on 440.950 and like Dave says, it really screams! Tower is 60 feet with a 20 foot antenna and people think the tower is at least 150 feet. Chad Nelson WI9HF/WRPL979 Janesville Wisconsin 608-754-8671 Send from my spectrum iPhone 16.
toggle quoted message
Show quoted text
On May 6, 2025, at 12:53?PM, Dave Bates via groups.io <Kf0xq1@...> wrote:
? I'm assuming this is an amateur repeater ? There are some used 408s, 404s, and if you want to go top shelf, some 420s online?for sale.? You just have to hunt for them ...? ?I paid $250 for our DB-420B.? Though it's cut for 450-470, It has plenty of sweep into the amateur 440 band.? ?Ours is on 444.000+ .... 1.5 to 1 SWR.? It really "screams" !! 40 mile range depending on topography. On Tue, May 6, 2025 at 11:07?AM Dale O'Neill via <djoneill63= [email protected]> 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
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Re: Multi-Bay Folded Dipole for 70cm
I'm assuming this is an amateur repeater ? There are some used 408s, 404s, and if you want to go top shelf, some 420s online?for sale.? You just have to hunt for them ...? ?I paid $250 for our DB-420B.? Though it's cut for 450-470, It has plenty of sweep into the amateur 440 band.? ?Ours is on 444.000+ .... 1.5 to 1 SWR.? It really "screams" !! 40 mile range depending on topography.
On Tue, May 6, 2025 at 11:07?AM Dale O'Neill via <djoneill63= [email protected]> 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
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Re: Looking for advice on antenna placement for our radio club repeaters.
No problem,? I? understand about the stroke..had an older brother who suffered one before he passed.. I stilll have several Spectrum VHF, 2 - 220, as well as a home built UHF I got from a ham in El Paso 25 yrs ago.. the RF boards probably aren't worth a flip but at least the CW ID and COR boards are.. I just usually use an external controller anyway, gives me more versatility
Plus a Kendecomm on 220.. I did Micor conversion once but I wasn't impressed. I prefer the GE Master IIs myself.. did a couple of those and they turned out great. In fact the UHF Exciter is easier to convert to 220 than the VHF Exciter. I has a cushcraft 4 pole on 220 but lost the elements via a theft at a tower site they were stored. Funny thing is I still have the harness. Never did like the crimp connectors on them.
I guess I need to kind of thin The Herd though. If anybody's interested in the 220 harness, I'll sell it because I don't need it. I can make my own finances up out of RG11 and 213..
And if anybody's interested in the Spectrum control boards or cor board, let me know again I don't need them.
My IFR A8000 is on the blink because the power supply died.? Been needing to get it working again so I can finish tuning up a UHF duplexer so I can ship that off asap! If I recall I can run it off the 12 volt input and I just found a square fuse cap for the back thanks to a friend of mine down on the road. Going to try and see if that works today or I'll just take it over to my friend's house who has a HP VNA but he's got a new girlfriend and you know what that means LOL
Chris
Chris? Yes ?you are correct t it is?a ?hustler?G7-220 antenna.?I¡¯m a stroke survivor typing does not always translate from my thoughts. After it posted I saw it said g6-200 which does not exist lol ?I ?do have a g6-144. Here at the house.on a ?spectrum SCR-77 2 meter machine.
I have 3 220 machines 2 are Spectrum SCR-1000¡¯s. The 3rd one is a converted Micor. And all 3 have kendecom. I believe the PA-100 100 watt amps on them. And GLB preamp preselectors on the front ends I have PD 220 stationmasters?on the other 2-220 machines I loved the old cushcraft 4 pole on my first 220 machines I. ?Hard to find them these days. Still have a 4 pole cushcraft on one of my 440 machines. It still works but I want to find and replace the harness on it before it fails over 30 years old.. it must be nearing its EOL ?Neal KA2CAF
On Tuesday, May 6, 2025, 9:36 AM, Chris Boone WB5ITT via <setxtelecom=[email protected]> wrote: Hustler G7-220....only G6 they make is 2m or dual band?
A Spectrum SCR 1000! Glad to see it's still chugging along. I knew Joe DeCorsella , I think I spelled that right, from there start in the '70s. I have an S7R on 220 myself but I've got to recrystal it for my new pair.. same RF boards anyway. Tuned up properly they just work. Always has great audio!
Chris WB5ITT?
You would be better off finding an old 450-470 db loop style db408 for the GMRS machine. Most two way radio shops have them laying around fakes down from commercial sites. I picked up 3 of them for under $100 each. This is my 220 site on a hustler g6-200 and the GMRS next to it on my 106 foot cow crank up tower. And my cabinet with the Motorola GMRS repeaters and my trusty soectrum 220 machine
Neal KA2CAF 
On Tuesday, May 6, 2025, 7:12 AM, wj9jrg via <wj9jrg=[email protected]> wrote: 712EFC is not a repeater antenna.? It's a base antenna not made for duplex operation.?? It has braided copper coax inside.?? That's why Comet calls them base antennas.? You will find the issue as duplex noise.
Andy WJ9J
Out club has a 55 foot tower on top of a high point in our county. We are in the process of upgrading the feedline and replacing the antennas. Our coverage for the current 2M/440 antenna at the top was excellent before we had feedline issues. We also currently have a Comet CX-333 tri band antenna side mounted on the tower. The base of CX-333 about 16 feet below the top of the tower. It has had decent coverage on 220 in the past but has recently degraded the last year. It will only be used for 220 operations. The reason for the tri-bander is that it has served as a backup antenna for the top 2M/440 currently and in the past due to antenna / feedline failure.
?
The club is adding a GMRS repeater to the site and the main question I have is, what is everyone¡¯s opinion of side is mounting a Comet CA-712EFC directly opposite the 220 Tri bander. ?Both standoffs are around 2.5 ¨C 3 feet off each side of the tower.
?
Also is there a rule of thumb on how much separation I should have from the top of the two side mounted antennas to the base of the top antenna?
?
This is what I have for the install:
Top of Tower - Comet GP-9 GP9N 2m/440 fed with 7/8 superflex ¨C 25 watts
Side Mount - Comet CX-333 (Used for 220Mhz) fed with 7/8 superflex ¨C 10 watts
Side Mount - Comet CA-712EFC (GMRS) Fed with ? superflex ¨C 25 watts
?
Thank you for your time!
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Gervais Fillion
Chris Boone WB5ITT
Phillip Campbell W4PHC