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5/8 WAVE VERTICAL ANTENNA
PROFESSIONAL RANGE
Continuous Reliable Power......

MORE THAN DOUBLE YOUR POWER

4.8dBi Gain, 2.8 times Effective Power Increase
90 MPH Plus, Wind Handling/Survival
+/- 2MHz bandwidth from centre frequency
Low VSWR < 1.5
50 ohm unbalanced input (SO-239 socket)


This high performance antenna is precisely tuned to the operating frequency of your choice. Using a tuned antenna provides your transmitter with a perfect match and a gain of around 4.8dB, increasing your effective radiated power by about 2.8 times.

With correct mounting the RF field strength directly below this antenna is much lower than a dipole. The truly unbalanced input prevents any RF currents traveling down the outer of the feeder cable. This combined with the low field strength below the antenna reduces the chance's of audio and TV interference considerably and maximises RF power to the horizon.

Coaxial line losses can be considerable at 88-108MHz. For long runs use a good quality cable such as RG213 or equivalent for connecting the antenna to the transmitter.

Total Length 2 metres approx. The antenna is constructed 100% from aluminum with the exception of a few plastic insulators and therefore does not contain any steel parts that can rust away.
PLEASE STATE FREQUENCY ON ORDERING

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58A High Performance 5/8 Antenna. Freq 63.71 122.32
TUNED DIPOLE ANTENNA
PROFESSIONAL RANGE
Continuous Reliable Power......
Our single tuned dipole is ideal for the beginner who wants to get on air fast within a limited price budget. The dipole has a built-in transformer to match the 72 ohm balanced terminal impedance to 50 ohm unbalanced (balun) feeder cable. This will provide an SWR of 1.5 or less and the correct termination to the transmitter.

The entire dipole system is truly plug and play and INCLUDES 10m of RG58 feeder coax cable with a PL259 plug fitted and a mounting clamp, this allows the dipole system to be plugged straight into a transmitter without the need of any additional connectors or soldering. Normally the dipole system clamps in a vertical position as high off the ground as possible to a mounting pole (1" to 2" Dia) which you need to provide yourself.

Only two frequency types of dipole are required to cover the entire FM broadcast band 88-98 MHz and 98-108 MHz. 50W MAXIMUM POWER HANDLING (this dipole is not suitable for use with the 100W power amplifier)

PLEASE STATE WHICH FREQUENCY TYPE YOU REQUIRE ON ORDERING

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TDA Dipole + 10m RG58 38.21 73.36

 

STACKED BROADBAND DIPOLES
PROFESSIONAL RANGE
Continuous Reliable Power......
The double stacked dipole has the benefit of 3.7dBi of gain and broadband operation. This is achieved using a specially designed splitter box to feed each dipole antenna with the correct RF signal phase. Providing the antenna is mounted correctly the SWR is less than 1.8 across the whole band from 87.5 to 108 MHz. This antenna system never needs tuning, just put your transmitter on any frequency from 87.5 to 108 MHz and switch on.

Normally the dipole system clamps as high off the ground as possible to a mounting pole of at least 4 meters in length and 50mm in dia which you need to provide and engineer yourself.

The RF field strength directly below this antenna is lower than that of a single dipole. The built in balun provides a truly unbalanced input and prevents any RF currents traveling down the outer of the feeder cable. This combined with the low field strength below the antenna reduces the chances of audio and TV interference considerably and maximises RF power to the horizon.

Coaxial line losses can be considerable at 87.5 - 108 MHz. For long runs use a good quality cable such as RG213 or equivalent for connecting the antenna system to the transmitter.

3.7dBi Gain at Band Centre, 2.3 times Effective Power Increase
SWR less than 1.8 from 87.5 to 108 MHz
20 MHz Bandwidth
Aluminum and ABS Construction
50 ohm unbalanced input (SO-239 socket)


Double Stacked Dipole

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2TDA Stacked Tuned Dipole Antenna System 76.46 146.80
ANTENNA ACCESSORIES
PROFESSIONAL RANGE
Continuous Reliable Power......



RG58 50 OHM COAX CABLE
Low cost 50 ohm cable suitable for short runs at VHF frequencies.
External diameter 5mm, Loss per 10m 2dB at 100MHz.
PRICE PER METRE





RG213 50 OHM COAX CABLE
High quality 50 ohm low loss cable recommended for long runs at VHF frequencies.
External diameter 10mm, Loss per 10m 0.68dB at 100MHz.
PRICE PER METRE

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RG213 RG213 50 ohm coax/metre 1.52 2.92

 




SWR METER
Easily tune your transmitter up to maximum RF output power or check your antenna match with this 50 ohm SWR meter. The design specification allows measurements at VHF 88-108 MHz. Construction is a steel case fitted with two SO239 sockets.
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SWRM SWR Meter Calibrated 88-108MHz 11.86 22.77



PL259 PATCH LEAD
Short length of RG58 pre-terminated with PL259 plugs for general use with SWR meters, power amps and dummy loads.



PL259 PLUG
The industry standard RF plug used on most VHF equipment. Two versions of the plug are available with 5-6mm or 9-10mm cable entry Suitable cables are RG213 and RG58 available from Veronica Kits. State 6mm or 9mm when ordering.
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PL259S PL259 RF plug small entry 1.01 1.94


SO239 CHASSIS SOCKET
Usually chassis mounted on RF equipment. Ideal for the antenna output on transmitters fitted into case's.
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SO239 SO239 RF socket 1.01 1.94


SO239 STRAIGHT ADAPTER
Two SO239 sockets back to back forming a barrel type connector allowing two PL259 plugs to be joined. Ideal for antenna extension cables.
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SO239B RF Straight Coupler 1.18 2.27
 
FM TRANSMITTER POWER AND RANGE
TECHNICAL INFORMATION
Continuous Reliable Service......

In theory the range of a transmitted radio signal is infinite regardless of power used, basically it goes on and on forever until it encounters an obstruction. More power helps to penetrate any obstructions. Given this, when engineering and planning a station it is always better to consider the issues that limit the range.

Range is limited by:

a) How far the transmitting antenna can effectively see. If you stand where the antenna is mounted and look out with a pair of binoculars, wherever you can see it is possible to transmit to. This can sometimes be up to 20, 30 even 40 miles if you are looking out from a mountain top.

b) Other sources of interference or other stations operating on the same frequency. For example the antenna may be able to see 20 miles, but if another station is on the same frequency 20 miles away, it will block/interfere with the signal.

c) Transmission power. If the antenna can see 20 miles, but say 1 Watt ERP of power used, it's very likely that about 1 mile of range will result. This is quite simply because there is not enough power to propagate the signal 20 miles. If 50 Watt ERP is used, it's very likely that 20 miles of range will be achieved. This is because 50 Watt ERP is ample power to propagate a strong signal 20 miles. If 1 Million Watts of power is used, it is very likely that signal will only propagate just over 20 miles. This because the range is limited as described in point a) above.

Assuming the antenna has a clear view, the frequency is clear and an average quality portable receiver is used, typical transmission power ver range figures are as follows:

Watts
ERP
1
2
4
8
16
32
64
128
256
512
Range
Miles
1.5
2.1
3.0
4.2
6.0
8.6
12.0
17.0
24.0
34.0

 

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