The following is straight from the Hy-Gain Web site
http://ourworld.compuserve.com/homepages/hygain/hfantcon.htm
105BA - 105CA:
The older 105BA 5 element 10 meter beam was replaced by the 105CA in August
of 1993.
The 105CA was developed using extensive computer modeling on YO-4/YO-5 and
NEC for Wires. There are 7 settings to choose from, including - CW, Low
Phone,
Mid Phone, OSCAR/FM, Broad-Band, Max F/B, and Max Gain. All designs were
verified on Hy-Gain's antenna test range using a Scientific Atlanta pattern
recorder
and HP network analyzers.
There are no extra parts to purchase in order to convert a 105BA in good
condition to a 105CA. New spacings for the 105CA are:
Refl - DE: 58 inches (1.473 m)
DE - D1: 45 inches (1.143 m)
D1 - D2: 83.5 inches (2.121 m)
D2 - D3: 100 inches (2.540 m)
Mast to D1: 38.75 inches (0.984 m)
Fixed Element Lengths:
R1: 44 inches (112 cm)
DE-1, D1-1, D2-1, D3-1: 24 inches (61 cm)
R2: 21.5 inches (54.6 cm)
DE-2, D1-2, D2-2, D3-2: 23.5 inches (59.7 cm)
CW Setting:
R-3: 42.25 inches (1073 mm)
DE-3: 54.375 inches (1381 mm)
D1-3: 53.5 inches (1359 mm)
D2-3: 51.75 inches (1314 mm)
D3-3: 48 inches (1219 mm)
Beta Length "L": 17 inches (432 mm)
Gain (dBd): 8.20
Max F/B: 27 dB
2:1 VSWR Bandwidth: 1100 KHz
Center Frequency: 28.200 MHz
Low Phone Setting:
R-3: 41.5 inches (1054 mm)
DE-3: 53.375 inches (1356 mm)
D1-3: 52.75 inches (1340 mm)
D2-3: 51 inches (1295 mm)
D3-3: 47.25 inches (1200 mm)
Beta Length "L": 17 inches (432 mm)
Gain (dBd): 8.22
Max F/B: 27 dB
2:1 VSWR Bandwidth: 1100 KHz
Center Frequency: 28.400 MHz
Mid-Phone Setting:
R-3: 40 inches (1016 mm)
DE-3: 52.25 inches (1327 mm)
D1-3: 51.375 inches (1305 mm)
D2-3: 49.625 inches (1260 mm)
D3-3: 45.875 inches (1165 mm)
Beta Length "L": 17 inches (432 mm)
Gain (dBd): 8.26
Max F/B: 27 dB
2:1 VSWR Bandwidth: 1100 KHz
Center Frequency: 28.800 MHz
OSCAR/FM Setting:
R-3: 37.125 inches (943 mm)
DE-3: 49.5 inches (1257 mm)
D1-3: 48.625 inches (1235 mm)
D2-3: 46.875 inches (1191 mm)
D3-3: 43.25 inches (1099 mm)
Beta Length "L": 17 inches (432 mm)
Gain (dBd): 8.35
Max F/B: 27 dB
2:1 VSWR Bandwidth: 1000 KHz
Center Frequency: 29.500 MHz
Broad-Band Setting:
R-3: 42 inches (1067 mm)
DE-3: 51.5 inches (1308 mm)
D1-3: 49 inches (1245 mm)
D2-3: 48 inches (1219 mm)
D3-3: 43.5 inches (1105 mm)
Beta Length "L": 28.375 inches (721 mm)
Gain (dBd): 8.20
Max F/B: 24 dB
2:1 VSWR Bandwidth: 1700 KHz
Center Frequency: 28.800 MHz
Max F/B Setting:
R-3: 41.5 inches (1054 mm)
DE-3: 54.25 inches (1378 mm)
D1-3: 52.5 inches (1334 mm)
D2-3: 45.875 inches (1165 mm)
D3-3: 38.25 inches (972 mm)
Beta Length "L": 10.375 inches ( 264 mm )
Gain (dBd): 7.56
Max F/B: 36 dB
2:1 VSWR Bandwidth: 600 KHz
Center Frequency: 28.500 MHz
Max Gain Setting:
R-3: 40.625 inches (1032 mm)
DE-3: 51.25 inches (1302 mm)
D1-3: 49.375 inches (1254 mm)
D2-3: 50.625 inches (1286 mm)
D3-3: 49.125 inches (1248 mm)
Beta Length "L": 13.5 inches (343 mm)
Gain (dBd): 8.60
Max F/B: 23 dB
2:1 VSWR Bandwidth: 400 KHz
Center Frequency: 28.500 MHz
Hope the info helps!
73 de Gary W0AW
rcook@hiwaay.net on 05/12/97 05:18:23 AM
To: ve6sv@oanet.com
cc: towertalk@contesting.com (bcc: Gary R. Hosler/MIPP/Imation)
Subject: Re: [TowerTalk] Hy-Gain 105BA Mod to 105CA
Could anyone tell me what you are supposed to get from the BA to CA
change?
73 Roger,ko4o
Kosmenko, Gordon wrote:
>
> Finally its antenna season in the great white north !
>
> Has anybody done the 105BA to 105CA mod ? Which dim did you set on ?
> (max gain, low phone)
>
> Did the mod make a operational performance difference ... have to
> remove the present 105BA from 90 feet ... will the effort make a
> difference ?
>
> Thanks for your comments in advance.
>
> 73 de Gord VE6SV
>
> ************************************************************
> * Gordon R. Kosmenko Email ve6sv@oanet.com *
> * 277 - 52306 Rge Rd 212 Telephone (403) 922-4331 *
> * Sherwood Park, AB Work (403) 917-7278 *
> * T8G 1A9 Amateur Station VE6SV *
> ************************************************************
>
>
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FAQ on WWW: http://www.contesting.com/towertalkfaq.html
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Problems: owner-towertalk@contesting.com
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FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
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