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OT-90 Radio Resurrection

Timberwolf22

Member
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24
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Location
Kenett Square PA
Today we fired up the recently painted OT-90.

She has been receiving a good amount of external attention - sand blasting and painting.

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So I was asked to spend some time on the radio equipment-to see what worked or might need to be replaced.We were able to get power to the R-123 radio = good place to start. After acquiring the right cables and comm helmets we were able to get speaker/microphone established with the R-123.

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There is no internal speaker on the R-123. You must use the headset for any radio functionality in the OT-90.
 
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Timberwolf22

Member
154
24
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Location
Kenett Square PA
So the goal for today........ see if we could receive on the R-123

This would help us verify a good number of communications components.

For the testing we plugged our helmets into the driver and TC intercom stations. Powered up the R-123 and then we broke out the manual.

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Since we needed a transmission source to receive I broke out some of my "test" gear I use to verify the SINCGARS is receiving....

I have a Radio Shack headset kit that transmits on 49.9Mhz... set this transmitter and plugged into iPhone for a source and set some music on a loop. Verified that I could listen on the Radio Shack provided headphones.

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After some trial and error I was able to configure the R-123 for 49.9Mhz and sure enough there was the music rom the iPad.

The 49.9Mhz is right below the 6 Meter HAM band in FM and while I am not allowed to transmit in this spectrum I can still monitor it...... looked like a good test for the day.
 
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Timberwolf22

Member
154
24
18
Location
Kenett Square PA
Test one - receiving on the R-123 = a success. That was big for us since it verified that the helmets, cables, intercom boxes and the R-123 were all able to be re-used.

Next step is to get all the intercom stations operational - that will be the next test of the system.

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Finally I will bring my 6 Meter HAM radios and SINCGARS radio and we will see if we can transmit in the lower range of the 6 Meter HAM band.

We are already looking for antenna elements - looks like we have just the base component of the antenna.
 
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Timberwolf22

Member
154
24
18
Location
Kenett Square PA
Doing a bunch of research on the drivers station.

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This is the Radio Unit in the Drivers Station

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All you other OT-90 / BMP owners throw info my way.............was still unable to get the intercom between driver and TC working and I also believe that this unit may be involve when transmitting with the R-123.
 
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muthkw25

Well-known member
Steel Soldiers Supporter
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Sayre, PA
It looks great. The photos I have are when I finished painting it. I didn't have the right lighting. It def came out looking great.
 
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