Cutting Diagrams
GP 27
¼ λ Ground-Plane Antenna for the 27 MHz Band or for Frequencies within 27…45 MHz
Description
- GP 27 is a glass fibre ground-plane antenna of the triple-leg type.
- The antenna is delivered factory-tuned to 27 MHz – further adjustment is not necessary for this band.
- Tunable (by cutting) to frequencies within the range: 27…45 MHz.
- The antenna can be field-tuned following the cutting diagrams below as a guide and fine-tuning using an VSWR-meter.
- For a small cutting charge the antenna may also be supplied factory-tuned. In this case, please state centre frequency.
- GP 27 is made of first class materials and will endure rough climates for years – no maintenance required
- LW-SS-1″ mounting bracket and GP Adapor is available as accessories.
- The radiator is measured from its free end to the bottom of the black insulator, while the radials are measured from their free ends to where they meet the GP-head.
Specification
| Electrical | |
| Model | GP 27 |
|---|---|
| Frequency | Tunable by cutting within : 27 – 45 MHz |
| Antenna Type | Ground-plane |
| Max. Input Power | 1000 W |
| 3 dB Beamwidth, H-Plane | Omnidirectional |
| Polarisation | Vertical |
| Pattern Type | Omnidirectional |
| Impedance | 50 Ω |
| Gain | 0 dBd (2.2 dBi) |
| VSWR | < 1.3:1 @ f. res. |
| Bandwidth | 1.0 MHz @ 27 MHz (VSWR < 1.5) 1.5 MHz @ 45 MHz (VSWR < 1.5) |
| Environmental | |
| Operating temperature range | -30 °C to +70 °C |
|---|---|
| Mechanical | |
| Wind Area | 0.062 sq. m / 0.67 sq. ft |
|---|---|
| Connection(s) | UHF(f) (fitting PL 259) |
| Materials | Elements : Glass fibre Metal parts : Bright chromed brass |
| Colour | White (RAL 9003) / Bright chrome |
| Historic Brand | Amphenol Procom |
| Height | Approx. 4500 mm / 177.17 in. |
| Wind Load | 78 N (160 km/h) |
| Weight | Approx. 1.7 kg / 3.75 lb. |
| Mounting | 38 mm dia. mast tube (42 mm dia. as option, see note) |
Ordering Codes
| Model | Product No. | Model |
|---|---|---|
|
GP 27 |
100000162 | GP 27 |
|
GP 27/42 mm |
100000163 | GP 27/42 mm |
Additional Information
Please Note
The GP 27 can be delivered with a GP-head for mounting on 42 mm dia. mast tube (standard is 38 mm) when ordering as option GP 27/42 mm.
PROCOM A/S reserves the right to
amend specifications without prior notice
PROCOM A/S • Smedetoften 12
DK 3600 Frederikssund • Denmark
Generated : 2026-06-26
Version 1