yamanx1
Head Honcho
Registered: 09-2007
Location: In a world of my own
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Sirio SD27 dipole
Vertical or horizontal 11m dipole
SD-27 Dipole
Sirio SD-27 Dipole CB/10m Antenna
• CB Base station antenna
• High power handling capability
• Factory tuned at mid-band
• Whip equipped with waterproof jointing sleeve
• Made of aluminium alloy 6063 T-832
Electrical Data
• Type: Dipole
• Frequency range: 26-28 MHz
• Impedance: 50O unbalanced
• Radiation (H-plane):
Horizontal mounting: Directional
Vertical mounting: Omnidirectional
• Polarization: horizontal
• Gain: 0 dBd, 2.15 dBi
• Bandwidth at S.W.R. 2:1: 3750 KHz
• S.W.R. at res. freq.: = 1.1:1
• Max. power:
1000 Watts (CW) continuous
3000 Watts (CW) short time
• Feed system / position: Gamma match / center
• Connector: UHF-female
Last edited by yamanx1, 18/Nov/2008, 9:59 am
---
By all means think yourself big, but never think others small.... R.F.Scott
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18/Nov/2008, 9:57 am
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26fb010
Accomplished DX-er
Registered: 01-2009
Location: BLACK COUNTRY
Posts: 574
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Re: Sirio SD27 dipole
use them horizontal for better results..
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7/Jan/2009, 1:18 pm
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W2RLH
Registered: 09-2009
Posts: 1
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Re: Sirio SD27 dipole
For anyone interested in using this antenna, see my review on a terrific bargain antenna.
http://www.hevener.com/sirio.html
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5/Sep/2009, 1:27 am
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topbuzzuk
Big Cheese
Registered: 11-2007
Location: Wiltshire, UK
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Re: Sirio SD27 dipole
thats a very good review, well written. top job
--- 26FB118
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5/Sep/2009, 7:04 am
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Yahoo
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crimso
Registered: 08-2009
Posts: 92
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Re: Sirio SD27 dipole
Not exactly sure why they need a Gamma match on this antenna, but used horizontally they make semi decent rotatable antenna.
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5/Sep/2009, 5:36 pm
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26fb010
Accomplished DX-er
Registered: 01-2009
Location: BLACK COUNTRY
Posts: 574
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Re: Sirio SD27 dipole
yes, i also wondered "why the gamma match"?
its probably because it confuses CBers and looks intelligent so they can hype the price!!
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7/Sep/2009, 5:53 pm
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rich 26fb456
Registered: 07-2009
Posts: 124
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Re: Sirio SD27 dipole
i have one of these antennas! but never used it its still in the box! may be i should try it?? i was also puzzled at the gamma match! all i can think off is it makes it quicker to tune you dont have to keep sliding the sections in and out to tune for chosen frequency? just move the gamma match!! 73s.
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8/Sep/2009, 3:42 pm
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56ww
DX-pert
Registered: 08-2009
Posts: 722
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Re: Sirio SD27 dipole
Hi,
Rich is right about that, and dipole is near 75 ohm but works great whit 50 and also antenna high will change matching point
73'mike
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8/Sep/2009, 6:07 pm
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rich 26fb456
Registered: 07-2009
Posts: 124
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Re: Sirio SD27 dipole
hi mike! not sure if your the mike i spoke to the other week?? on the band i think it might be??? nice to see you on here! i think the dipole is a very underated antenna! they have been used as a bench mark for other antennas gain for years+years! i also think the dipole is probably the best value as well !! with its horizontal/vertical options! you could almost say two antennas in one!! 73s.
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9/Sep/2009, 2:43 pm
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29fb002
Freebander
Registered: 09-2009
Posts: 37
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Re: Sirio SD27 dipole
The SD27 is very much like the element of a sy27 3 or 4.
I had the sy27-4 and it broke , so i used the element fof / mobile dx.
Works good on flat side.
--- Yaesu Ft 1000Mp MkvV (200 w) ,Moonraker 4,Create RC5, MFJ949E ,W2IHY 8band and eqplus , t-bone studio mic.
WKS 100 for AM day
Yaesu Ft857D - KL 400- K40 or dipole (mobile)
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10/Sep/2009, 12:58 am
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