Larsen Antennas

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Overview

Overall, I've been quite happy with Larsen Antenna products. They're nice looking, well made, and above all, reliable. I've only ever had problems with two antennas, and both of those had plastic-encased center loading coils. One appeared to have arc'ed over, evidenced by a small pin-hole in the side of the loading coil. The other probably went open as the SWR went through the ceiling.

Loss Table(s)

Larsen CX (RG-58A/U, Belden 8259)
Frequency dBd/100ft Notes
150 Mhz 6.8 (per datasheet)
225 Mhz 8.5 (estimated)
450 Mhz 12.9 (per datasheet)
825 Mhz 18.3 (per datasheet)
900 Mhz 19.1 (estimated)


Comparison of Larsen CX and UD coax at 146Mhz with a Larsen NMO2/70B antenna: UNIQ58c6d4b4b1001031-ss-00000000-QINU

CX UD
Coax RG-58A/U RG-58U
Belden # 8259 8240 (DS)
Frequency 146 Mhz 146 Mhz
Loss per 100' 6.697 dB 4.682 dB
Length 11.50' 11.50'
Loss 0.77 dB 0.54 dB
Power in 55.0W 55.0W
Power out 46.1W 48.6W
Antenna gain 1.6 dBd 1.6 dBd
ERP 66.6W 70.2W


Comparison of Larsen CX and UD coax at 223 Mhz with a Larsen NMO220C antenna:

CX UD
Coax RG-58A/U RG-58U
Belden # 8259 8240 (DS)
Frequency 223 Mhz 223 Mhz
Loss per 100' 8.632 dB 5.946 dB
Length 17.00' 17.00'
Loss 1.47 dB 1.01 dB
Power in 25.0W 25.0W
Power out 17.8W 19.8W
Antenna gain 3.0 dBd 3.0 dBd
ERP 35.6W 39.5W


Comparison of Larsen CX and UD coax at 445Mhz with a Larsen NMO2/70B antenna:

CX UD
Coax RG-58A/U RG-58U
Belden # 8259 8240 (DS)
Frequency 445 Mhz 445 Mhz
Loss per 100' 13.281 dB 8.890 dB
Length 11.50' 11.50'
Loss 1.53 dB 1.02 dB
Power in 50.0W 50.0W
Power out 35.2W 39.5W
Antenna gain 3.0 dBd 3.0 dBd
ERP 70.2W 78.8W


Comparison of Larsen CX and UD coax at 902 Mhz with a Larsen NMO5T900B antenna:

CX UD
Coax RG-58A/U RG-58U
Belden # 8259 8240 (DS)
Frequency 902 Mhz 902 Mhz
Loss per 100' 21.152 dB 13.669 dB
Length 3.25' 3.25'
Loss 0.69 dB 0.44 dB
Power in 30.0W 30.0W
Power out 25.6W 27.1W
Antenna gain 5.1 dBd 5.1 dBd
ERP 82.9W 87.6W

Documents

Readings

These need to be formatted.

IC-207H  52.5W -> 43.8W @ 146.000Mhz
         27.0W -> 20.0W @ 445.000Mhz
         
IC-208H  56.0W -> 47.7W @ 146.000Mhz
         52.5W -> 40.0W @ 445.000Mhz
         
DR-235T  15.7W -> ??.?W @ 223.000Mhz (Couldn't get to back of radio)

TK-931HD 28.0W -> 18.6W @ 902.687Mhz
         22.5W -> 19.0W @ 927.500Mhz