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Could someone explain this antenna spec to me

70cutlass442

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I am looking at a UHF antenna for my Humvee. They are not easy to find. I can get one that is used primarily for positioning and locating and they list this in the specs:

10 Watt CW, 200 Watt Peak, 2% Duty Cycle, 1 Millisecond on time

Seems low but I have no issue running 10 watts or less for GMRS or Ham. My concern is it saws 10 watts on CW. Is CW different than voice when we are talking RF power output?
 

RFI-EMI-GUY

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That antenna spec sounds like some avionics or military spec. It sounds totally unsuitable for GMRS. What is the model number? Why not one of the many affordable Larsen NMO mount antennas?
 

prcguy

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Is the antenna a 4 bolt pattern for the scoop mount over a tail light? I may have some Shakespeare UHF mil 4 bolt antennas in my garage that would cover GMRS with a 70 watt rating. I will dig around tomorrow to find them. I believe the are this model. 4266 UHF Antenna - Shakespeare Military Antennas

What you really want is the 30-512MHz version with diplexer so you can run a CB and GMRS at the same time. I have a couple of these also. SFB3512D/VRC Multi-Band Antenna With Diplexer - Shakespeare Military Antennas

I am looking at a UHF antenna for my Humvee. They are not easy to find. I can get one that is used primarily for positioning and locating and they list this in the specs:

10 Watt CW, 200 Watt Peak, 2% Duty Cycle, 1 Millisecond on time

Seems low but I have no issue running 10 watts or less for GMRS or Ham. My concern is it saws 10 watts on CW. Is CW different than voice when we are talking RF power output?
 

70cutlass442

Member
Premium Subscriber
Joined
Jan 24, 2010
Messages
315
Is the antenna a 4 bolt pattern for the scoop mount over a tail light? I may have some Shakespeare UHF mil 4 bolt antennas in my garage that would cover GMRS with a 70 watt rating. I will dig around tomorrow to find them. I believe the are this model. 4266 UHF Antenna - Shakespeare Military Antennas

What you really want is the 30-512MHz version with diplexer so you can run a CB and GMRS at the same time. I have a couple of these also. SFB3512D/VRC Multi-Band Antenna With Diplexer - Shakespeare Military Antennas
I will take the 4266 if you have one. That is exactly what I am looking for actually. I was going to settle for this since it was cheap.
 

70cutlass442

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Jan 24, 2010
Messages
315
That antenna spec sounds like some avionics or military spec. It sounds totally unsuitable for GMRS. What is the model number? Why not one of the many affordable Larsen NMO mount antennas?
Us military vehicle guys are somewhat purists when it comes to certain things. I could easily make a plate and screw a NMO mount to it utilizing the existing mount, but that distracts from the original look which I want to avoid.
 

prcguy

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So Cal - Richardson, TX - Tewksbury, MA
I found the antennas and one is a Shakespeare 4310 that covers 225 to 420MHz and the other is a RAMI that covers 420 to 450Mhz, neither are good for GMRS. I also found a couple of VHF 118 to 174MHz and the 30-512 versions, which I don't want to part with but they are out there surplus.

Crap.

I will take the 4266 if you have one. That is exactly what I am looking for actually. I was going to settle for this since it was cheap.
 

RFI-EMI-GUY

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Dec 22, 2013
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Us military vehicle guys are somewhat purists when it comes to certain things. I could easily make a plate and screw a NMO mount to it utilizing the existing mount, but that distracts from the original look which I want to avoid.
I am sure somewhere out in the wild is a military Humvee with an NMO mount bodged on. There may even be an adapter.
 
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The 1 ms on time is new to me, sounds like an active component. Never seen duty cycle listed but I don't look at antenna specs often, is that something new? If my math is correct transmitting for 5 seconds in a minute is 8% duty cycle.
 

RFI-EMI-GUY

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Dec 22, 2013
Messages
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The 1 ms on time is new to me, sounds like an active component. Never seen duty cycle listed but I don't look at antenna specs often, is that something new? If my math is correct transmitting for 5 seconds in a minute is 8% duty cycle.
Those specs sound like what would be used for a radar or radar transponder. Those applications use a very high peak power and low average power. Your concern would be CW, or continuous wave (average) power.

5/60=8.33%
 
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