repeater?
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NCSHP311
- Posts: 360
- Joined: Sat Feb 25, 2006 3:36 pm
- What radios do you own?: Astro Saber, XTS', APX's
repeater?
A local private ambulance company I work part time at has a 50 watt repeater, connecter to a diapole antenna which the tip is at about 85 feet off the ground. The owner is looking for a way to get more out put, we are looking at the possiblilty of adding an amp? would this be a feasable soulution compared to a new repeater? I know we really need to move the antenna higher......please help as much as possible......
Only if you want the FCC on your @$$ for changing you system without authorization, especially if you start to increase your coverage range and begin interfering with another user on the same frequency.
I'd suggest checking your FCC license first before purchasing or changing anything.
There are strict FCC rules that apply to the maximum ERPower which goes along with the antenna gain and the antenna height.
If the system was installed by a professional shop then I'd contact them or simply check the FCC paper work which you should have.
M
I'd suggest checking your FCC license first before purchasing or changing anything.
There are strict FCC rules that apply to the maximum ERPower which goes along with the antenna gain and the antenna height.
If the system was installed by a professional shop then I'd contact them or simply check the FCC paper work which you should have.
M
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440roadrunner
- Posts: 236
- Joined: Mon Aug 16, 2004 3:47 pm
Raising the antenna, if that ACTUALLY is the problem, will help a lot more than increasing power.
You must realize, that doubling the power only affects the received signal at the other end by 3DB, the proverbial "1/2 an S unit"
Fifty watts is respectible power. Few base stations run more than 50-100, so frankly I'd look for other problems, such as
A problem with nearby objects shading the signal
Problems with the antenna pattern
Excessive feedline loss
SWR, by the way, may not be an indicator of any of this
You must realize, that doubling the power only affects the received signal at the other end by 3DB, the proverbial "1/2 an S unit"
Fifty watts is respectible power. Few base stations run more than 50-100, so frankly I'd look for other problems, such as
A problem with nearby objects shading the signal
Problems with the antenna pattern
Excessive feedline loss
SWR, by the way, may not be an indicator of any of this
To restate what has already been said:
Height usually gives better results than power.
Line loss is inevitable, but can be reduced.
You are licensed for freq, height and power. Alter those at your own peril. There are no licensing requirements for cans and string.
My advice, go as high as you can within your license and use a straight run of good cable. Cheap cable will lose a lot, but connectors are worse.
All too often you see someone blow their budget on high powered transmitters, then scrounge through the trash for some 1/2" heliax with kinks in it. After a couple of sections of that spliced together with barrels, they go to a unity whip halfway up the tower and wonder why their site sucks.
Height usually gives better results than power.
Line loss is inevitable, but can be reduced.
You are licensed for freq, height and power. Alter those at your own peril. There are no licensing requirements for cans and string.
My advice, go as high as you can within your license and use a straight run of good cable. Cheap cable will lose a lot, but connectors are worse.
All too often you see someone blow their budget on high powered transmitters, then scrounge through the trash for some 1/2" heliax with kinks in it. After a couple of sections of that spliced together with barrels, they go to a unity whip halfway up the tower and wonder why their site sucks.
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