Repeater Power and Duplexer

[Jake313]

This is a two part question about GMRS repeaters. According to what I've been reading online and what I'm seeing in the FCC rules. For a fixed or base station there is a output limit of 15w. Is this correct or am I reading into this wrong?

 

Second part is any recommendations for duplexers you've had good luck with as far as little to no tuning? I see several options on ebay, many offer to tune the duplexer for you.

[Billy]

50 Watts at the back of the machine, if duplexer is internal 50 watts at that is how I understand it.  Sorry, no leads on duplexers except that I have heard varying reports about the tuning abilities of some of the foreign makers. 

[Guest spd641]

Cellwave would be my recommended choice in a small duplexer.I use one and have used several but it seems these are the most reliable...William

[Jake313]

Thanks guys. Yeah I ended up going with a Cellwave. Free tuning off of ebay buyer too.

[Unit61]

This is a two part question about GMRS repeaters. According to what I've been reading online and what I'm seeing in the FCC rules. For a fixed or base station there is a output limit of 15w. Is this correct or am I reading into this wrong?

 

Second part is any recommendations for duplexers you've had good luck with as far as little to no tuning? I see several options on ebay, many offer to tune the duplexer for you.

Maybe this will help a little:

§95.135   Maximum authorized transmitting power.

(a) No station may transmit with more than 50 watts output power.

( [Reserved]

© A small control station at a point north of Line A or east of Line C must transmit with no more than 5 watts ERP.

(d) A fixed station must transmit with no more than 15 watts output power.

(e) A small base station must transmit with no more than 5 watts ERP.

[48 FR 35237, Aug. 3, 1983, as amended at 53 FR 47717, Nov. 25, 1988; 63 FR 68975, Dec. 14, 1998]

 

 

To help with descriptions of a Fixed Station, Control Station, and Base Station:

 

§ 95.61

    Fixed station communication points.

    (a) A fixed station may transmit communications from the point authorized for it on the license to another fixed station in the same GMRS system at the point authorized for it on the license.

    ( A fixed station must not transmit communications to any other station.

 

§ 95.59

    Control station communication points.

    (a) A control station may transmit communications as a radio control link (see § 95.127) to a remotely controlled station.

    ( A control station may transmit communications through a mobile relay station to:

    (1) Mobile station units in the same GMRS system as the control station; and

    (2) Mobile station units in any other GMRS system.

    © A control station must not transmit communications to any other station.

 

§ 95.55

    Base station communication points.

    (a) A base station may transmit communications directly to:

    (1) Mobile station units in the same GMRS system;

    (2) Mobile station units in any other GMRS system; and

    (3) Paging receivers in the same GMRS system.

    ( A base station must not transmit communications to:

    (1) Any mobile relay station;

    (2) Any base station;

    (3) Any paging receiver not in the same GMRS system;

    (4) Any fixed station;

    (5) Any control station;

    (6) Any station in the Amateur Radio Service;

    (7) Any unauthorized station; or

    (8) Any foreign station.

 

A little extra info:

 

§ 95.57

    Mobile relay station communication points.

    (a) A mobile relay station in a GMRS system may automatically (without immediate thought or action by the station operator) retransmit communications between:

    (1) A mobile station unit in the same GMRS system and:

    (i) Another mobile station unit in the same GMRS system; or

    (ii) A control station in the same GMRS system.

    (2) A mobile station unit in any other GMRS system and:

    (i) Another mobile station unit in the same GMRS system as the mobile relay station; or

    (ii) A control station in the same GMRS system as the mobile relay station.

    ( A mobile relay station in a GMRS system must not automatically retransmit communications between:

    (1) A mobile station unit in any other GMRS system and another unit of the same mobile station, unless:

    (i) The other GMRS system is licensed to an individual; and

    (ii) The licensee of the GMRS system with the mobile relay station has given permission to use the mobile relay station for this purpose;

    (2) Any control station and any other control station;

    (3) Any other mobile relay station and any station;

    (4) Any base station and any station; or

    (5) Any fixed station and any station.

    [48 FR 35237, Aug. 3, 1983, as amended at 53 FR 47716, Nov. 25, 1988]

[PastorGary]

Hello Robert and thank you for joining us here again at MyGMRS forum.  Haven't chatted with you in quite some time. Please check your MyGMRS forum PM inbox for a memo regarding your north construction project and LAGGROUP.

 

Thanks for your posts and Welcome Back...

[zap]

Maybe this will help a little:

§95.135   Maximum authorized transmitting power.

(a) No station may transmit with more than 50 watts output power.

( [Reserved]

© A small control station at a point north of Line A or east of Line C must transmit with no more than 5 watts ERP.

(d) A fixed station must transmit with no more than 15 watts output power.

(e) A small base station must transmit with no more than 5 watts ERP.

[48 FR 35237, Aug. 3, 1983, as amended at 53 FR 47717, Nov. 25, 1988; 63 FR 68975, Dec. 14, 1998]

 

 

To help with descriptions of a Fixed Station, Control Station, and Base Station:

 

§ 95.61

    Fixed station communication points.

    (a) A fixed station may transmit communications from the point authorized for it on the license to another fixed station in the same GMRS system at the point authorized for it on the license.

    ( A fixed station must not transmit communications to any other station.

 

§ 95.59

    Control station communication points.

    (a) A control station may transmit communications as a radio control link (see § 95.127) to a remotely controlled station.

    ( A control station may transmit communications through a mobile relay station to:

    (1) Mobile station units in the same GMRS system as the control station; and

    (2) Mobile station units in any other GMRS system.

    © A control station must not transmit communications to any other station.

 

§ 95.55

    Base station communication points.

    (a) A base station may transmit communications directly to:

    (1) Mobile station units in the same GMRS system;

    (2) Mobile station units in any other GMRS system; and

    (3) Paging receivers in the same GMRS system.

    ( A base station must not transmit communications to:

    (1) Any mobile relay station;

    (2) Any base station;

    (3) Any paging receiver not in the same GMRS system;

    (4) Any fixed station;

    (5) Any control station;

    (6) Any station in the Amateur Radio Service;

    (7) Any unauthorized station; or

    (8) Any foreign station.

 

A little extra info:

 

§ 95.57

    Mobile relay station communication points.

    (a) A mobile relay station in a GMRS system may automatically (without immediate thought or action by the station operator) retransmit communications between:

    (1) A mobile station unit in the same GMRS system and:

    (i) Another mobile station unit in the same GMRS system; or

    (ii) A control station in the same GMRS system.

    (2) A mobile station unit in any other GMRS system and:

    (i) Another mobile station unit in the same GMRS system as the mobile relay station; or

    (ii) A control station in the same GMRS system as the mobile relay station.

    ( A mobile relay station in a GMRS system must not automatically retransmit communications between:

    (1) A mobile station unit in any other GMRS system and another unit of the same mobile station, unless:

    (i) The other GMRS system is licensed to an individual; and

    (ii) The licensee of the GMRS system with the mobile relay station has given permission to use the mobile relay station for this purpose;

    (2) Any control station and any other control station;

    (3) Any other mobile relay station and any station;

    (4) Any base station and any station; or

    (5) Any fixed station and any station.

    [48 FR 35237, Aug. 3, 1983, as amended at 53 FR 47716, Nov. 25, 1988]

 

Older post but I almost get the sense that by the definition of fixed station that the FCC is trying to say a station with a directional antenna...which would make sense for a 15W limit. Control/shotgun link.

 

Internal duplexers are a technicality as very few repeaters actually have duplexers that aren't a separate unit from the repeater and just hidden in the case. I'd say 50W at the output of the PA amplifier.

[Steve]

95.55(b)A base station must not transmit communications to(2)Any base station;

 

so if i have a GMRS antenna on my roof with a "basestation" kenwood tk-880 radio, i can't set up the same thing at my friend's house a mile away and talk with his "base station"?  It has to be something else like base station to HT?

[Steve]

bump.  

 

Wondering if this is one of the gray areas of GMRS rules.