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XPR5550 high power, need low power tx

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TampaTyron

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I have a bunch of high power UHF 5550 control stations (in guard shacks) that are close to my customer's UHF Capacity Plus site. Each control station has a large outdoor antenna. I am showing -20dBm on my repeater inputs on the RX multicoupler outputs from the controls stations. Not good. Cant reduce multicoupler gain due to reducing the portable radio coverage. So, any decent way to reduce the high power radio's tx? I would like to go into Tuner and drag the power slider down, but am guessing that is not an acceptable solution......? If I can't find a software solution, then it will be small antennas buried in the guard shacks. Thank you, TT
 

MSS-Dave

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I have a bunch of high power UHF 5550 control stations (in guard shacks) that are close to my customer's UHF Capacity Plus site. Each control station has a large outdoor antenna. I am showing -20dBm on my repeater inputs on the RX multicoupler outputs from the controls stations. Not good. Cant reduce multicoupler gain due to reducing the portable radio coverage. So, any decent way to reduce the high power radio's tx? I would like to go into Tuner and drag the power slider down, but am guessing that is not an acceptable solution......? If I can't find a software solution, then it will be small antennas buried in the guard shacks. Thank you, TT
You should be able to reduce your transmitter output to about 20 watts, I don't think you can go lower than that. The next thing you could do is make an inline attenuator either with a bunch of RG58 or put in a 20 watt 6 DB attenuator in the antenna line if you can get the power turned down. The way I read your question your control stations are fairly close to the system so you can take a fairly large hit on your receive sensitivity. What RSSI do you see on your control stations as it is right now?

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Project25_MASTR

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You can turn a high power unit down as far as 9W when it comes to the XPR5550. To verify, the CPS will state the power range under the Device Information.

What I typically do, put ducks on the radios and run them at low power but ideally that works best if you can get the radios down to 5W.
 

MSS-Dave

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You can turn a high power unit down as far as 9W when it comes to the XPR5550. To verify, the CPS will state the power range under the Device Information.

What I typically do, put ducks on the radios and run them at low power but ideally that works best if you can get the radios down to 5W.

Thanks for this info. I haven't been into 5550 at all so I figured they might be like the bricks in XPR8400 that won't go below 20.
 

Firebuff880

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Looking at a code plug for an XPR-5550 with the HHCH.

The Device Page indicates - Power range Watts 20.0 - 48.0

An under General Settings you have the Low TX & High Tx settings that can then be toggled via a button.

Lower then 20 Watts you will need to put it on the bench and tune it down manually.

==============
 

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Project25_MASTR

Millennial Graying OBT Guy
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Looking at a code plug for an XPR-5550 with the HHCH.



The Device Page indicates - Power range Watts 20.0 - 48.0



An under General Settings you have the Low TX & High Tx settings that can then be toggled via a button.



Lower then 20 Watts you will need to put it on the bench and tune it down manually.



==============



I may have pulled a XPR5550e codeplug. People have not been labeling which of the two at the office lately…


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masstech

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I hear coax and a dummy load still make for a good radiating source if you're close enough! ������
 
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TampaTyron

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I may put one of those right angle mini-u male to bnc female adapters on it. Then put a bnc portable whip on it.... see if I can smoke it at 20 watts (but with TDMA). TT
 

N4KVE

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I would never use an antenna 1 inch from a radio that was transmitting 20 watts into it. Maybe with 10 feet of coax to get some distance from the radio.
 

Firebuff880

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I would never use an antenna 1 inch from a radio that was transmitting 20 watts into it. Maybe with 10 feet of coax to get some distance from the radio.

5550 e

High Power Output:
VHF: 25-45 W
UHF Band 1: 25-40 W
UHF Band 2: 1-40 W
800: 10-35 W
900: 10-30 W

Low Power Output:
VHF: 1-25 W
UHF Band 1: 1-25 W
 

N4KVE

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What that means is the hi power output radio [45 watts] can not go below 25 watts on low power. But the low power output radio [25 watts] can go as low as 1 watt on the low power setting.
 
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