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Motorola Radius P1225 "dummy Load"

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NCFire11

Member
Joined
Jul 25, 2007
Messages
539
Is there a way to make a dummy load for the radius p1225 so that i can Tx on a certain frequency without transmitting over the whole county.

I dont really want to pay $30 for nothing but metal.

I dont know exactly how they work but i know that they absorb the power being output during Tx so that it isnt transmitted as far(usually within ~10 ft)

I was going to just take a bolt that has the same threads used on the P1225 and screw it in but i didnt know if that would just basically act as an antenna or what.

I have been Tx'ing without an antenna to test pagers but ive heard that is bad for the radio.

This is the threading:




Thanks!
 

N4DES

Member
Joined
Dec 19, 2002
Messages
2,156
That only dissipates 1 W, is that enough?

This one dissipates even more then, doesnt it?

05-01215 - BNC-Male 75-Ohm Dummy Load Termination Coax - eBay (item 360106159702 end time Mar-05-10 06:48:38 PST)

That is a 75 ohm termination. Hit that with 5 watts out of you portable after you figure out how to connect it to a BNC and it will be toast.

Really a lot depends on how long you expect to TX and the duty cycle. Personally I wouldn't do less than a 20 watt dissipation capability or 10 watts if I know that I will only be transmitting for a few seconds every 3 to 5 minutes.
 
N

N_Jay

Guest
No. 75ohms is not right, but not far enough off to hurt anything.

You want a 50 ohm, and 1.5 to 2 times the output power of the radio.

What are you trying to do?
 
N

N_Jay

Guest
That would be a good start.

If you can program the radio down to minimum power, it would be even better.
 

NCFire11

Member
Joined
Jul 25, 2007
Messages
539
Eh, dont have the cable or software, so that doesnt help, can you find me a terminator that fits my needs, (hopefully from ebay)

Thanks
 

NCFire11

Member
Joined
Jul 25, 2007
Messages
539
Nope it needs to be portable.

And it looks like that thing would easily break one of the adaptors or the port on the radio so..
 

N4DES

Member
Joined
Dec 19, 2002
Messages
2,156
Didnt ask for you to be a smartass..

The only reason i dont like it is because it is so bulky.


Touchy..touchy...touchy...remember you came to US for advice.
If you don't like the answers, which are technicially sound, then go somewhere else.
 
N

N_Jay

Guest
Nope it needs to be portable.

And it looks like that thing would easily break one of the adaptors or the port on the radio so..
Why portable.

If you are testing pagers put it at the other end of a short piece of cable.
 
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