The FM Model calculator determines the potential exposure from radiofrequency (RF) electromagnetic fields produced by FM broadcast station antennas at ground level. The FM Model software was originally developed by the FCC in 1997 as a standalone executable program and this improved version provides more precise predictions and runs via a JavaScript enabled web browser. The FM Model is originally based on measured data published in 1985 by the EPA.      ▼ Show More.... 

This version uses the actual distance to each antenna element, rather than the distance to the antenna’s radiation center, improving separation distance precision. While most predictions using this updated FM Model will be similar to the previous version, this correction could result in significant differences from the previous model at short separation distances from the bottom element of an antenna array where accurate exposure estimation is most critical. Appendix A of the FM Model Public Notice contains a brief description of these changes.

Under Antenna Type in the user interface below is a collapsible list of associated antenna models cross-referenced with the five EPA element types, initially in Appendix B of the FM Model Public Notice, including any subsequent changes we received.  Element designs that are not in this list because they were not specifically evaluated by EPA, e.g., panel antennas, vertical dipoles, etc., should be treated as Type 1.  We continue to invite suggested changes and corrections to this list.  Inclusion of antenna models on this list does not constitute an endorsement of those manufacturers or their products by the FCC.  

Channel Selection
Antenna Type - +
EPA Type 1: Ring-and-stub, or any type not-otherwise described
Example Make Model
BEXT TFC1K
Dielectric DCR-L
ERI ECFM
G4CPH
G4CPL
G4CPM
LPC
37CP
37M
1105
Harris FMC
FMS
Jampro JLCP
NiCOM BKG88
RFS CPF
Shively 6810
6812/6812C
6813
SWR FM1
EPA Type 2: Opposed "V" dipole
Example Make Model
BEXT TFC2K
Jampro JCPB
JHCP
JHPC
JLLP
JLPC
JMCP
JMPC
JSCP
JSLP
MCI AT12
NiCOM BKG77
PSI FML
RFS 828
Shively 6832
6842
SWR FM3
FM10
FMEC
FMU
EPA Type 3: Opposed "U" dipole
Example Make Model
BE BEMP
BESP
ERI G5CPM
G5CPS
LP
LPX
MP
MPX
SHP
SHPX
Harris FMH
FML
FMP
FMX
Jampro JBCP
EPA Type 4: Two-piece spiral
Example Make Model
Armstrong FMA-707/727/737
Dielectric CCA

DCR-C/HDR-C

DCR-H/HDR-H
DCR-T
ERI 100A
Shively 6277
6814
6815
6822
SLV
EPA Type 5: Three-piece spiral or Four-piece spiral
Example Make Model
Dielectric DCR-G
DCR-M/HDR-M
DCR-MT
DCR-MFE
DCR-Q
DCR-S/HDR-S
Shively 6828
Height (m) Distance (m)
ERP-H (W) ERP-V (W)
Num of Elements Element Spacing (λ)
Num of Points

 

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Updated: 
Thursday, May 18, 2017