RFI COL28 VHF Collinear Antenna, 115-148 MHz
$1,926.71 inc GST ($1,675.40 exc GST)
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RFI COL28 VHF Collinear Antenna, 115-148 MHz
3dBd broadband duplex collinear built for transmit/receive separations up to 4.6MHz.
Overview
The COL28 is a "cut to frequency" collinear antenna covering the 115-148MHz VHF band, designed specifically to cater for transmit-to-receive separations of up to 4.6MHz. The antenna is a series fed collinear housed in a heavy duty tapered fibreglass radome, fitted to an alodined aluminium mounting tube.
The COL28 is specifically designed to maintain stable vertical radiation pattern characteristics at the extremities of its spot-tuned bandwidth, ensuring reciprocity of transmit and receive signal characteristics. It's internally DC grounded for lightning protection and reduced static noise.
Key Features
- 3dBd (5dBi) gain means strong omnidirectional coverage across the VHF band.
- Broadband duplex design means support for transmit/receive separations up to 4.6MHz.
- 200W input power means suitability for base station applications.
- DC grounded design means better lightning protection and reduced static noise.
- Alodined aluminium mounting tube means a robust, corrosion-resistant installation.
Applications
- Base station sites in the 115-148MHz VHF band
- Duplex applications requiring transmit/receive separations up to 4.6MHz
- Single frequency or simplex VHF applications
- Sites where minimal tower loading is required
Key Specifications
| Product Code | COL28 |
| Frequency Range | 115-148MHz VHF |
| Gain | 3dBd / 5dBi |
| Tuned Bandwidth | 4.0% |
| VSWR | <1.5:1 (14dB return loss) |
| Nominal Impedance | 50Ω |
| Vertical Beamwidth | 38° |
| Input Power | 200W |
| Connector | N female bulkhead |
| Construction | Alodined aluminium elements with white fibreglass radome |
| Length | 3.8m |
| Weight | 4.2kg |
| Mounting Area | 500mm x 44mm diam. alodined aluminium |
| Suggested Clamps | 2 x UC1 |
| Wind Load @160km/h | 182N |
| Wind Gust Rating | 212km/h |
FAQs
What separations does the COL28 support for duplex operation?
The COL28 is designed to cater for transmit to receive separations of up to 4.6MHz within the 115-148MHz band.
Is this antenna suitable for simplex use as well?
Yes, the COL28 is suitable for both single frequency (simplex) and duplex applications.
Overview
Features
Specifications
RFI COL28 VHF Collinear Antenna, 115-148 MHz
$1,926.71 inc GST ($1,675.40 exc GST)