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Most common problems with this antenna: 

1. Water entry into the F connections just below the antenna...electrolysis will corrode the soft copper 
center conductor of the coax. 

Cure:  Clean off the corrosion, dry the connectors and seal against the weather with "coax-seal" putty 
tape.  Electrical tape will not ensure a water tight connection. 

2. Separation of the coax from the internal amplifier's printed circuit board from not supporting a long 
cable against downloading or, from a sharp pull to the coax. 

Changeable Antenna Amplifier 

 

 

 

 

 

 

 

 

 

 

 

Reference from www.naval.com/tube-amp 

Removing the changeable/repairable amplifier   

Look into the mounting flange and the white plastic cap will be seen. Grip the rim of the cap with long 
nose pliers and pull. Move pliers to the other side of the cap and pull and wiggle. The cap should 
break free of its silicone rubber seal and slide towards you on the cable with the black rubber boot 
attached.  This will expose the snap ring retainer. Using a snap ring tool, compress the snap ring and 
remove it.  The amplifier can then be removed by a steady pull on the coax cable. It is connected to 
the inside of the antenna simply by a push on PAL connector as shown above.  

Once the amplifier has been removed, push the coax cable into the tube and the whole assembly will 
slide out the top of the tube.  

Summary of Contents for PR-422CA

Page 1: ...9 91 1 F Fa ax x 8 81 13 3 8 88 85 5 3 36 60 01 1 E Em ma ai il l s sa al le es s n na av va al l c co om m W We eb bs si it te e w ww ww w n na av va al l c co om m Operation Manual Video Entertainme...

Page 2: ...a pattern omni directional Supply voltage to antenna 15VDC nominal Current consumption 130 mA Nominal Operating temperature 40 to 55 C Protection circuits static discharge device fires at 65 volts Imp...

Page 3: ...c charges and is removable for field repair or replacement Projected life at sea 15 years This internal amplifiers receive 15VDC operating power from the Naval head end via coax cable It is removable...

Page 4: ...plifier should be less than 75 feet for best results Any coaxial cable exposed to sunlight should be painted with non metallic paint to prevent possible UV damage over the long term Bolt the head end...

Page 5: ...R or equivalent Test procedures TDR reading should be taken on each piece of coaxial cable where physical measurements are not possible Lengths of all cables to one foot accuracy should be shown on as...

Page 6: ...wings These final drawings are invaluable for future trouble shooting Copies should be made for Naval Tampa the Ship owner and the Shipyard for future reference Naval Tampa will archive such drawings...

Page 7: ...or to the Antenna Input port via a DC block Adjust the level of the generator for 0 dBmV and a frequency suitable for the amplifier being adjusted Measure the signal at the outlet with the weakest sig...

Page 8: ...f overlap with each winding Shown below is a short pigtail of RG 59U coax cable terminated in a Snap and Seal F connector which is then joined to a female female adapter or barrel connector The antenn...

Page 9: ...oward the fitting with one half overlap with each winding The last wrap again comes straight back over the previous wrap without a diagonal The seal is slightly sticky and should be molded now by hand...

Page 10: ...tube amp Removing the changeable repairable amplifier Look into the mounting flange and the white plastic cap will be seen Grip the rim of the cap with long nose pliers and pull Move pliers to the oth...

Page 11: ...ration at sea Lead content is then less than 10 grams of Lead Pb total Specify with order and note that RoHS certification and sticker are omitted The product has an expected life of 15 years at sea t...

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