Anyone know what type this is?

Status

Gtaman

Prolific Contributor
CS Forums $upporter
Joined
Apr 27, 2013
Messages
367
As the title says, we use Comsonics QAM sniffers to track cable leaks. I’m trying to figure out what the model of the PCTEL antenna is. I’ve looked online and in the comsonics material and cannot find any info.

pic for reference
 

Attachments

  • 8DC0318D-92AC-4642-A99E-C9E93E591C10.jpg
    8DC0318D-92AC-4642-A99E-C9E93E591C10.jpg
    93.4 KB · Views: 263

Viper1-6

Prolific Contributor
CS Forums $upporter
Joined
Nov 4, 2012
Messages
335
I’m guessing a VHF 1/4wave with something home made added.
 

Notarola

Prolific Contributor
CS Forums $upporter
Joined
Feb 4, 2012
Messages
2,398
I saw something similar years ago. I believe it is UHF. The lower rod feeds up to the top of the larger cylinder which acts like a discone type antenna with a vertical radiator (effectively making it a elevated feed discone). I think years ago radio shack made something similar as a 'back of the set' scanner antenna.
 
OP
Gtaman

Gtaman

Prolific Contributor
CS Forums $upporter
Joined
Apr 27, 2013
Messages
367
I saw something similar years ago. I believe it is UHF. The lower rod feeds up to the top of the larger cylinder which acts like a discone type antenna with a vertical radiator (effectively making it a elevated feed discone). I think years ago radio shack made something similar as a 'back of the set' scanner antenna.


Going by the Comsonics sheet it goes up to 612Mhz. I’ll see if we have any old spares at the office and tear one apart. Looks to be a special build from PCTEL for Comsonics.
 

ChartoftheDistrict

Contributing Member
Joined
Oct 28, 2013
Messages
34
According to the information on the units

The antenna would be picking up a marker carrier from the injection unit at the head-end of the system

The frequencies their injection transmits a carrier on include 136/139 - 612 - 744 MHz. So a dual band VHF/580-800 MHz antenna would fit the bill

https://resources.tessco.com/attachments/231534_MMI_20180330_A55136TB,TBSmm.pdf

Would lean them toward these from first review

CoD
 

astrow3

Contributing Member
Joined
Dec 12, 2013
Messages
33
According to the information on the units

The antenna would be picking up a marker carrier from the injection unit at the head-end of the system

The frequencies their injection transmits a carrier on include 136/139 - 612 - 744 MHz. So a dual band VHF/580-800 MHz antenna would fit the bill

https://resources.tessco.com/attachments/231534_MMI_20180330_A55136TB,TBSmm.pdf

Would lean them toward these from first review

CoD

I agree it is most likely a dual band, VHF/580-800 MHz. Seen antennas like this several times and they have always had a reasonable SWR across the he whole band split. What colour is painted on the inside rim of the connection?
 

astrow3

Contributing Member
Joined
Dec 12, 2013
Messages
33
I agree it is most likely a dual band, VHF/580-800 MHz. Seen antennas like this several times and they have always had a reasonable SWR across the ** whole band split. What colour is painted on the inside rim of the connection?
 
OP
Gtaman

Gtaman

Prolific Contributor
CS Forums $upporter
Joined
Apr 27, 2013
Messages
367
I agree it is most likely a dual band, VHF/580-800 MHz. Seen antennas like this several times and they have always had a reasonable SWR across the ** whole band split. What colour is painted on the inside rim of the connection?


I don’t see any colours on it. None on the base or on the elements. You are dead on though. I’m looking for a supplier to order these for scanner antennas.
 

astrow3

Contributing Member
Joined
Dec 12, 2013
Messages
33
I'll PM you when I get the contact details of the person we use here in Australia. I will ask them if there is a EU/UK agent. It would work amazing for scanning! Great idea :)
 

astrow3

Contributing Member
Joined
Dec 12, 2013
Messages
33
My contact has advised me to suggest a Browning BR-137. 136-174, 380-520, 698-960 MHz (No Tuning Necessary)
I can give you a contact in the US if you would like? No UK/EU agent.
 
OP
Gtaman

Gtaman

Prolific Contributor
CS Forums $upporter
Joined
Apr 27, 2013
Messages
367
My contact has advised me to suggest a Browning BR-137. 136-174, 380-520, 698-960 MHz (No Tuning Necessary)
I can give you a contact in the US if you would like? No UK/EU agent.

I have one of those in my office. I would not need a contact to order them.
 
Status