Mast Preamplifier for VHF / UHF / SHF

mast Pre-Amplifier

To successfully participate on VHF, you need a good receiver. These modes aren't called 'weak signal modes' without a reason... No matter if you do SSB via tropo conditions, EME or meteor scatter with modern digital modulation techniques - an excellent pre-amplifier, located close to the antenna, is indispensable. It helps to overcome the cable losses of long feed lines and improves the noise figure of the overall system.

The following criteria are important when selecting a mast pre-amplifiers:

We offer mast pre-amplifiers from two manufacturers: SSB Electronic (Iserlohn, Germany) and by SHF-Elektronik (Darmstadt, Germany). Both are well renowned german manufacturers with high quality standards

SSB-Electronic offers the 'Super-Amp' series of monoband mast pre-amplifiers for bands from 6m to 13cm, as well as a dual band pre-amp for 2m/70cm plus a wide band pre-amp for scanners. The preamps can be used with vox switching at reduced power or with PTT switching a high power. Hi quality helix filters suppress unwanted interference. The power supply is done over the coaxial cable or directly with a separate line. When using high power the manufacturer recommends the use of a sequencer.

SHF-Elektronik manufactures a large selection of pre-amplifiers for mast mount, for bands from 6m to 13cm, as wel las wideband models, models with two selectable antenna inputs and a 'Mini' series with an exceptionally favorable price/performance ratio. The amplifiers can handle large signal inputs very well and use stae-of-the-art semiconductors like MES-FETs and similiar components, Tx/Rx switching is possible by Vox or PTT keying. The amps are equipped with helix or discrete filters for best selectivity.

Mast Receive Pre-Amplifier for 2m

 

Vorverstaerker MVV 144-VOX MVV 144-VOX
Vorverstaerker MVV 144 / 2 MVV 144 / 2
Vorverstaerker MINI-2 MINI-2
Vorverstaerker SP-200 SP-200

The pre-amps are simply inserted into the coaxial feed line. The power supply is either done over the coaxial cable or via a separate line. Most recent transceivers offer a supply voltage on their coaxial VHF/UHF connectors, so no external Bias-T (DC injector) is required. If required we offer a large selection of DC-injectors with or without sequencer, see below.

Most amplifiers can also be supplied with a separate DC cable. Please note that the cable should be protected with ferrites against high induction voltages.

The amplifiers do have a built-in HF vox, which allows automatic and reliable operation at standard power levels. For higher power levels a separate PTT keying line must be used. Thiscan be done directly from the PTT line of the transceiver, or by means of a separate sequencer. Most important for a pre-amplifier is the adequate gain at a good (high) 3. order intercept point (IP), this is necessary for a good large signal handling capability. Most amplifers have an adjustable gain level, this protects the receiver against overload while sufficiently compensating for cable losses.

With the larger models, the transmit/receive switching is done with real coaxial-relays, the 'Mini' series by SHF-Elektronik uses print relays. Most amplifiers (except Mini-2) are installed in two enclosures: on the inside a metal case shielding against RF, on the outside a weather proof UV resistant plastic box. A metal clamp for mast installation is included in shipment.

The pre-amp should be located as close to the antenna as possible to keep the cable (and the cable losses) as low as possible. The connecting cable to the antenna should be of high quality.

The 2m/144MHz band is certainly the most used VHF band, regardless if used for tropo DX, EME, meteo scatter or FM. Here a good pre-amp is certainly most useful. At several occasions contest take place and the band is densely populated with very strong signals. This requires a pre-amp with good large signal handling capabilities.

Technical Data 144MHz (2m) Mast Pre-Amplifier
Model MVV 144-VOX MVV 144 / 2 MINI 2 SP-200
Frequency Range 144-146 MHz
Noise Figure typ. 0,6 - 0,9 0,6 - 0,9 0,6 - 1,0 0,5 dB
Gain typ. 10 - 20 [1] dB
Max. Power (VOX) 350 (SSB) / 200 (FM) 150 (SSB) / 50 (FM) 100 (SSB) Watt
Max. Power
with Sequencer
750 (SSB) / 250 (FM) 750 (SSB) / 500 (FM) Watt
Insertion Loss (TX) 0,3 0,3 < 0,5 0,04 dB
Operating Voltage 13,5 13,5 13,5 12 - 14 V
Current c. 50 50 50 250 mA
DC-Feed via a separate cable or over coax
Max. Mast diameter 56 58 mm
Connections N N N N
Number of antennas 1 2 selectable
antenna inputs
1 1
Order Nº 26101 26102 26103 26100

[1] Adjustable gain, to adjust the enclosure must be opened.

Order No.
26101 MVV 144-VOX Mast Pre-Amplifier 144MHz 209.00
26102 MVV 144 / 2 Mast Pre-Amplifier, Antenna Switch 144MHz 209.00
26103 MINI-2 Mast Pre-Amplifier 144MHz 109.00
26100 SP-200 Mast Pre-Amplifier 144MHz 299.00

 

Mast Receive Pre-Amplifier for 70cm

 

Vorverstaerker MVV 432-VOX MVV 432-VOX
Vorverstaerker MVV 432 / 2 MVV 432 / 2
Vorverstaerker MINI-70 MINI-70
Vorverstaerker SP-70 SP-70

To operate a pre-amp on 70cm, the same basic principles apply - see above at 2m: insert into coaxial line, power supply over coax or separate cable, keying by vox or PTT line, with or without sequencer.

The 70cm/432MHz band is less used for SSB than 2m, but much more for FM. On the other hand the cable attenuation is much higher. An adjustable amplification is not strictly required because strong signals are not as prevalent as on VHF.

Technical Data 432MHz (70cm) Mast Pre-Amplifier
Model MVV 432 VOX MVV 432 / 2 MINI-70 SP-70
Frequency Range 430-440 MHz
Noise Figure typ. 0,8 - 1,2 0,8 - 1,2 0,7 - 1,0 0,7 dB
Gain typ. typ. 22, max. 26 typ. 22, max. 26 10 - 25 [1] 12 - 22 [1] dB
Max. Power (VOX) 350 (SSB) / 200 (FM) 350 (SSB) / 200 (FM) 150 (SSB)/ 50 (FM) 50 (FM) Watt
Max. Power with sequencer 500 (SSB) / 250 (FM) 500 (SSB) / 300 (FM) Watt
Insertion Loss TX < 0,5 < 0,5 < 0,5 0,15 dB
Operating Voltage 13,5 13,5 13,5 12 - 14 V
Current intake c. 200 200 200 320 mA
DC Feed via a separate cable or over coax
Mast diameter max. 56 58 mm
Connectors N N N N
Number of antennas 1 2 switchable
antenna inouts
1 1
Order Nº. 26106 26107 26108 26105

[1] Adjustable gain, to adjust the enclosure must be opened.

Order No.
26106 MVV 432-VOX mast Pre-Amplifiers 432MHz 209.00
26107 MVV 432 / 2 mast Pre-Amplifiers, Antenna Switch 432MHz 239.00
26108 MINI-70 mast Pre-Amplifiers 432MHz 109.00
26105 SP-70 mast Pre-Amplifiers 432MHz 299.00

 

Mast Receive Pre-Amplifier for 6m

 

Vorverstaerker MVV 50 VOX MVV 50 VOX
Vorverstaerker MVV 50 / 2 MVV 50 / 2
Vorverstaerker SP-600 SP-600

To operate a pre-amp on 6m, the same basic principles apply - see above at 2m and 70cm: insert into coaxial line, power supply over coax or separate cable, keying by vox or PTT line, with or without sequencer.

Although the cable attenuation on 6m is not as high as on 2m or 70cm, the antennas are much bigger and the gain lower. This can be easiyl compensated by a pre-amplifier. The activity on 6m heavily depends on the state of the ionosphere - at times of sporadic-E propagation the band is packed and a free frequency is hard to find. At other times the band is much more quiet. The pre-amp should be able to handle the strong signals without any problems.

Technical Data 50MHz (6m) Mast Pre-Amplifier
Model MVV 50-VOX MVV 50 / 2 SP-600
Frequency Range 50-54 50-52 50-52 MHz
Noise Figure typ. 0,6 - 0,9 0,6 - 0,9 0,4 dB
Gain typ. 10 - 22 [1] 10 - 22 [1] 10 - 20 [1] dB
Max. Power (VOX) 250 (SSB) / 200 (FM) 250 (SSB) / 200 (FM) 100 (SSB) Watt
Max. Power with sequencer 750 (SSB) / 250 (FM) 750 (SSB) / 500 (FM) Watt
Insertion Loss TX 0,2 0,3 0,05 dB
Operating Voltage 13,5 13,5 12 - 14 V
Current intake ca. 100 100 260 mA
Max. mast diameter 56 58 mm
Connectors N N N
Number of antennas 1 2 switchable
antenna inputs
1 1
Order Nº 26119 26120 26118

[1] Adjustable gain, to adjust the enclosure must be opened.

Order No.
26119 MVV 50-VOX Mast Pre-Amplifier 50MHz 189.00
26120 MVV 50 / 2 Mast Pre-Amplifier,Umschalter 50MHz 169.00
26118 SP-600 Mast Pre-Amplifier 50MHz 299.00


SP-23 /SP-13 Mast pre-amps for 23cm and 13cm

Similar design as the preamps for 2m and 70cm; these preamps always provide full amplification in order to compensate for the high cable losses at these frequency bands. The entire preamp is built upon a low-loss Teflon PCB. The SP-23 uses high performance coaxial relais and a low loss air strip-line design in the transmit path. The SP-13 features a parallel-coupled micro-stripline filter and microwave specified print-mount relais for the trx-control.

Technical Data Receive Pre-Amplifier
SP-23 SP-13
Frequency range 1250-1300 2300-2400 MHz
Noise figure typ. 0,9 1,2 dB
Amplification typ. 20 25 dB
Max. Power (VOX) 10 10 Watt
Max. Power with DCW-15 (SSB) 100 50 Watt
Max. Power with DCW-15 (FM) 50 25 Watt
Insertion loss 0,4 0,5 dB
Supply voltage 12 – 14 12 – 14 V
Power requirement c. 400 120 mA
Mast diameter 58 58 mm
Connectors N N

[1] The amplification can be adjusted internally by a variable attenuator.

Order No.
26110 SP-23 Mast Pre-Amp 1250MHz 229.00
26115 SP-13 Mast Pre-Amp 2300MHz 399.00

 

Power Protector

Every contester is afraid of: transmit by accident into the output of the ultra-low noise preamp, any you need a new one...
No more such trouble with our power protector. To be installed between 2m TX and preamp (or downconvertor), this small magic box prevents HF power from entering your preamp. RX insertion loss is just 0.1 dB, a DC bypass is provided to allow DC supply of the preamp thru the coax. The unit itself is passive: more cabling or power supply is not required!
RF Power-Protector absorbs RF power up to 30W FM or 50W SSB. Furthermore it forces the TX output protection circuit to decrease the output power by ensuring a poor VSWR at the TX output.

Order No.
26165 Power Protector 114.90

 

Sequencer with bias tee (DC injector)

Features electronic sequence controlling insuring the proper sequencing of both power amplifier and preamplifier switching. The sequencer guarantees that preamp switchover occurs before power amplifier turn on by first removing the preamplifier control voltage and then providing a relay closure the PTT line of the linear amplifier. This insures that hot switching which could damage the preamp relay contacts or destroy the GaAsFET's does not occur. Low loss bias-T's are built into the sequence controller to allow the preamp control voltage to be fed to the preamp via the coax cable. No need for additional DC cable! The preamp and the PA can be controlled separately; built-in LED's reflect the status of the sequencer. Connectors: N-type for antenna cable, for control cable Sub-D.

Order No.
26132 DCW-2004 for 6m, 2m and 70cm pre-amps 239.00
26132.SHF DCW-2004SHF for 23cm and 13cm pre-amps 239.00

 

BIAS-T without sequencer

Bias Tee (DC injector) to supply mast pre-amps or converters over the coax cable. HF suitable construction, low insertion loss and excellent SWR. Available with N jacks. N version useable up to 3 GHz.

Technical Data
Model FSP 144 FSP 432 FSP 1296 FSP BB DCC-12/N
Frequency Range 144 - 146 430 - 440 1240 - 1300 50 - 2500 50 - 3000 MHz
Insertion Loss (@150 MHz) 0,2 0,3 0,8 0,8 0,1 dB
Max. Power 350 (SSB) 350 (SSB) 100 (SSB) / 40 (FM) 100 (SSB) / 40 (FM) 250 (SSB) / 100 (FM) Watt
Size 52x38x27 37x37x30 37x37x30 37x37x30 37x37x30 mm
HF Connectors N
DC Connector Cinch DC coaxial
Order Nº 26137.2 26136.70 26136.23 26136.BB 26136

With article number 26136 the DC connector is included in the shipment. All articles with cinch connector for DC need a seperately ordered connector.

Order No.
26137.2 FSP 144 2m Bias-T 39.00
26137.70 FSP 432 70cm Bias-T 35.00
26137.23 FSP 1296 23cm Bias-T 35.00
26137.BB FSP BB Wideband Bias-T 35.00
26136 DCC12 Bias-T o 45.00
42033 Cinch connector, solder 4.10

 

DBA-270 Dualband pre-amplifier

The Dualband Mast-Preamplifier DBA-270 improves the receiving characteristics of amateur radio stations in the 2-m and 70-cm-Band. Due to the built-in Diplexer only one HF-socket for the combi-antenna and the coaxial cable has to be connected.
The maximum output power is 100 Watt. As all preamplifiers made by SSB-Electronic GmbH, the DBA-270 offers direct feeding as well as remote feeding. Direct feeding is done over a UHF socket, remote feeding the existing coaxial cable is used, as usual. You should connect a crossover network Type DCC-12.
The DBA-270 can be switched by the transceiver via the coaxial cable, if the transceiver can contrrol a mast preamplifier.

Technical Data  
Frequency range 144-146
430-440
MHz
Noise figure typ. 0,5
0,7
MdB
Amplification 20
24
dB
HF-power 200W SSB
100W FM
 
Insertion loss 0,1
0,2
dB
Operation voltage 12-14 V
Current consumption 250 mA
Mast diameter 58 mm
Order No.
26125 Duoband pre-amplifier 299.00

 

LNA-5000 Wideband pre-amplifier

Wideband mast pre-amp from 50 up to 5000 MHz with excellent large signal rejection (IP3> 30dBm) and low noise figure, suitable for many applications: Scanner, receivers or to enhance sensitivity of measuring devices. Also suitable as low power amplifier with up to 20 dBm output, amplification c. 20dB, noise figure c. 2dB, N jacks, supply voltage 10 to 20V.
Direct DC feed or DC feed over coax, weatherproof cabinet incl. mast clamp. A Bias-T is not included! A suitable Bias-T is DCC-5000 (26138).

Order No.
26180 LNA-5000 179.00
26138 Bias-T DCC-5000 49.90

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