3/8"-24 rather than NMO 3/4" mount for scanner antenna?

[zuzu]

Although the 3/4" NMO mount seems to be defacto standard, in my searching I've come across 3/8" antenna mounts described as "3/8-24". Can anyone provide more information on where these are available, and what scanner antennas (like the Larsen 150/450/800 or Maxrad MaxScan1000) are available that will screw into a 3/8" mount rather than an NMO mount?

I'm looking to mimic a standard car vertical whip antenna on the passenger's side hood/fender. NMO mounts are too large to accomplish this.

Thanks.

 

[fineshot1]

I've been scanning since the early 70's when it was all crystal scanners and have never seen one but that does not mean they do not exist. Your best bet would be to try searching the internet via google or your preferred search engine. If you find any I sure would like to see one.

 

[zuzu]

I've been scanning since the early 70's when it was all crystal scanners and have never seen one but that does not mean they do not exist. Your best bet would be to try searching the internet via google or your preferred search engine. If you find any I sure would like to see one.

The only one I've turned up so far is the Wintenna Scan Master.

 

[byndhlptom]

3/8-24

There have been several 'standard' antenna mounts over the years

3/8-24 is a common one used with CB whip antennas, ie. most of the fiberglass & loaded steel 3-5 foot whips use this thread size. It is the thread size for the standard ball mount, mirror mounts etc. used in the CB field.

There was a 3/8 hole mount used mostly by Antenna Specialists antennas in the 60-80's. It 'snapped' into the hole, then a sleeve was inserted into the mount to lock the mount in place. It was used extensively in both their 1/4 wave whips and Base loaded antennas (including several CB models)

The MNO also mount can also be found in a version that uses a 3/8 hole and other specialty variations (thick panels, angle adjustable, etc.). Antenna Specialists and others have made disguise antennas that mimicked factory AM/FM antennas for VHF hi and UHF. They may still offer them......

hope this helps

tom

 

[Grog]

http://www.hamstick.com sells a few antennas which use that thread. They can be used as receiving antennas as well as for transmitting.

As an example....
http://www.hamstick.com/edbw.htm

 

[n5ims]

Several Larsen antennas are available with a "LM" mount, which is a 5/16 - 24 post mount. The link below shows the mounts available from Larsen.

http://www.larsen-antennas.com/docfiles/ASB9/Mounts.pdf

 

[prcguy]

Several companies make scanner antennas with 3/8-24 threads like Workman and Firestick but I would be cautious using one above VHF due to the variation in available mounts. A 3/8-24 CB ball mount is nearly a 1/4 wavelength equivalent at UHF and even the smallest bolt and threaded coupling 3/8 mount is a good portion of a 1/4 wavelength at 800MHz. The NMO mount is fairly standardized and gives predictable performance, although some mounts are optimized for 800MHz and above.
prcguy

 

[ReCall]

You are right Tom, Antenna Specialists for years was the CopShop for those antenna's and I put them on many a unmarked car's back then, AS has/had 4 kits for that mounting , 2 for just for the whip and 2 for the base loaded coil, I have run one of those on my old truck at times with the beveled mounting kit.
Just keep in mind what prcGuy is saying about Frequencies you may want to scan. He's right !

ReCall

 

[prcguy]

Late in the game A/S started making NMO compatible antennas and supplied an adapter with some of their older mounts to work with the NMO antennas. I've seen these adapters on trunk and mag mounts and they were made of plastic, which will not work with some NMO antennas that need a ground connection for a coil.
prcguy

You are right Tom, Antenna Specialists for years was the CopShop for those antenna's and I put them on many a unmarked car's back then, AS has/had 4 kits for that mounting , 2 for just for the whip and 2 for the base loaded coil, I have run one of those on my old truck at times with the beveled mounting kit.
Just keep in mind what prcGuy is saying about Frequencies you may want to scan. He's right !

ReCall

 

[fineshot1]

thanks

hey fellas thanks for posting this info. i do not at this time need one of these but its nice to know the extra choices are available.