Antenna Specialist 5/8 wave

[merlin]

It is indeed an Antenna Specialists mount. I installed hundreds of those in the early 70's while working for a local two-way radio shop as a high school student. The hole required was 3/8". The anchor mount snaped into the hole. RG-58 pushed up through. Cable barrel slid over the coax. Once this is done use two open-end wrenches to tightening down the mount.

Shield stripped back and spread out on top of the mount (trim to keep the shield from interfeering with the threads of the cap. The center of the coax push thru the silver cap and the cap tightened onto the mount.

Center of the coax stripped about 1/8" above the mount. Rubber gasket pushed on and then the bared copper conductor pushed thru the hole in the center of the antenna base cap. the center conductor cut 1/4" and bent over into the small groove. Then screw on the loading coil.

As GlobalNorth said the whips were quite long to cover down to 136mhz. We would typically cut off about 9 to 10 inches ( give or take for 155 mhz) and then adjust to minimum SWR using the set screw at the top of the coil.

I still have few laying around. And of course, never saved any documentation.....

View attachment 111688

Glad someone has a photo of the mount, they are decent mounts but the problem now is since 1972, auto bodies are made of thinner metal and these would take less force to pull out of the body. the newer bodies, some aluminum, easier yet. Take a 3/8 X 1 1/2 flat washer on the inside could reinforce the mount and it would break before pulling out. You still should remove the antenna and put a weather cap on the mount for car washes.
I noticed this one doesn't have the elbow at the bottom for the coax, those usually came with the coax installed.

 

[prcguy]

Even on old cars with thick skin I've seen a number of 3/8" snap in mounts pull out. Repairs range from using an auto body repair hammer and anvil on the inside of the roof pounding out the torn metal to making a super thin washer with 3/8" hole on the underside of the roof, etc. Not fun for the car owner or radio install guy.

Glad someone has a photo of the mount, they are decent mounts but the problem now is since 1972, auto bodies are made of thinner metal and these would take less force to pull out of the body. the newer bodies, some aluminum, easier yet. Take a 3/8 X 1 1/2 flat washer on the inside could reinforce the mount and it would break before pulling out. You still should remove the antenna and put a weather cap on the mount for car washes.
I noticed this one doesn't have the elbow at the bottom for the coax, those usually came with the coax installed.

 

[mrweather]

Those RS antennas were made by Antenna Specialist, for some reason, they were not a big seller and discontinued.
That was back when Allide owned Radio shack.

Well, I bought this RS CB antenna back in 1995 (it was the no-hole trunk lid mount, #21-908) so not sure if A/S was still supplying them or not.

 

[prcguy]

I have a vague memory of opening a radio shack coil from the 70s and the construction was much different than an A/S. You could tell the A/S was US made and the RS was more like Chinese quality.

Those RS antennas were made by Antenna Specialist, for some reason, they were not a big seller and discontinued.
That was back when Allide owned Radio shack.

 

[merlin]

Well, I bought this RS CB antenna back in 1995 (it was the no-hole trunk lid mount, #21-908) so not sure if A/S was still supplying them or not.

I don't know who made the mounts but you could find A/S mounts in trunk lip style, one that folded into the trunk and gutter clip styles. They had that 3/8 typical mount for A/S and could be had with the stud mount for like the Shakespear and Hustler.
@ prcguy you are probably right. I never opened one but the mounting and appearance was the same.
Don't recall when A/S got bought out but the design was still made til early 80s. Motorola made the same antenna until early 90s. New old stock can still be found searching, I just bought the 42-50 version and found Tram in 26-30.
That might be Chinese. I had that from A/S on my Cadillac cut for 10 meter.

 

[zagger]

It is indeed an Antenna Specialists mount. I installed hundreds of those in the early 70's while working for a local two-way radio shop as a high school student. The hole required was 3/8". The anchor mount snaped into the hole. RG-58 pushed up through. Cable barrel slid over the coax. Once this is done use two open-end wrenches to tightening down the mount.

Shield stripped back and spread out on top of the mount (trim to keep the shield from interfeering with the threads of the cap. The center of the coax push thru the silver cap and the cap tightened onto the mount.

Center of the coax stripped about 1/8" above the mount. Rubber gasket pushed on and then the bared copper conductor pushed thru the hole in the center of the antenna base cap. the center conductor cut 1/4" and bent over into the small groove. Then screw on the loading coil.

As GlobalNorth said the whips were quite long to cover down to 136mhz. We would typically cut off about 9 to 10 inches ( give or take for 155 mhz) and then adjust to minimum SWR using the set screw at the top of the coil.

I still have few laying around. And of course, never saved any documentation.....

View attachment 111688

You said you have a few of these laying around. How much your to take for a coupe of them, shipped?

 

[kc0kp]

I put in a bunch of snap in 3/8 but in the early 70s when the NMO came out, I never did another one again. BTW does everyone know that NMO is short for new Motorola mount? The old mount was a repackaged ASP201.

 

[kc0kp]

The coil is not a normal loading coil but a impedance match and should be pretty similar across brands. 5/8 wave is not a 50 ohm antenna and needs to be matched to behave with a 50 ohm feedline. 5/8 is capacitive relative to 50 ohms and needs a tapped inductor to counteract and match

 

[merlin]

I have an old Radio Shack CB antenna with the exact same female connector in the coil base and the male pin in the vehicle mount. Like a completely opposite SO239/PO antenna connector.

The M-125,,very same design, just a bit more wire in the coil.

 

[robertwbob]

It is indeed an Antenna Specialists mount. I installed hundreds of those in the early 70's while working for a local two-way radio shop as a high school student. The hole required was 3/8". The anchor mount snaped into the hole. RG-58 pushed up through. Cable barrel slid over the coax. Once this is done use two open-end wrenches to tightening down the mount.

Shield stripped back and spread out on top of the mount (trim to keep the shield from interfeering with the threads of the cap. The center of the coax push thru the silver cap and the cap tightened onto the mount.

Center of the coax stripped about 1/8" above the mount. Rubber gasket pushed on and then the bared copper conductor pushed thru the hole in the center of the antenna base cap. the center conductor cut 1/4" and bent over into the small groove. Then screw on the loading coil.

As GlobalNorth said the whips were quite long to cover down to 136mhz. We would typically cut off about 9 to 10 inches ( give or take for 155 mhz) and then adjust to minimum SWR using the set screw at the top of the coil.

I still have few laying around. And of course, never saved any documentation.....

View attachment 111688

i stilluse an as big maggie on my pickup.wish as was still in buisness. at least hustler is still going