Unfortunately, a standard transceiver in a standard setup doesn't allow you to hear the grass growing....The receiver's front-end noise figure is average and the coax cable attenuation adds to the overall system performance. Only way out: Use a high performance low-noise preamp very close to the antenna!
Our mast preamps made by SSB-Elektronik have the following special features:
The preamps are inserted in the coax cable; power supply via the coax cable. Most modern transceivers feature a built-in power supply for mast preamps which eliminates the use of a separate remote power supply. However, we offer various remote power supplies with bias-Tee's with (DCW-15) and without (DCC-12) sequencer.
Alternatively the preamps may be supplied by using a separate DC line feed. The coax DC feed, however, seems better suited than feeding the DC voltage over a separate line; the separate line may function as a long wire antenna and catch a lot of inductive voltages along the way.
The preamps are either RF sensed (VOX) or PTT (hard keyed); operations up to 100 Watt is guaranteed. For higher power we recommend the PTT-operations or a sequencer (e.g. DCW-15). The typical noise figure is 0.9 dB at 15dBm IP3. The gain is adjustable between 10 dB and 20 dB. The adjustable gain features enough gain reserve in case of extensive antenna cables and prevents front-end overdrive in case of using very short antenna cabling.
Out-of-band signals are effectively eliminated by the use of high performance helical filters. For the transmit-receive function real coax relais are used. Each and every preamplifier is tested, measured and tuned to meet the specs before delivery commences. The casing is a two cabinet construction with shielded inner box and a UV-protected weatherproof housing with mast clamp.
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 | SP-6 | SP-2000 | SP-7000 | SP-23 | SP-13 | |
|---|---|---|---|---|---|---|
| Frequency range | 50-52 | 144-146 | 430-440 | 1250-1300 | 2300-2400 | MHz |
| Noise figure typ. | 0,9 | 0,9 | 0,8 | 0,9 | 1,2 | dB |
| Amplification typ. | 20 | 20 | 20 | 20 | 25 | dB |
| Max. Power (VOX) | 100 | 100 | 100 | 10 | 10 | Watt |
| Max. Power with DCW-15 (SSB) | 500 | 750 | 500 | 100 | 50 | Watt |
| Max. Power with DCW-15 (FM) | 100 | 500 | 300 | 100 | 25 | Watt |
| Insertion loss | 0,1 | 0,2 | 0,4 | 0,4 | 0,5 | dB |
| Supply voltage | 13,8 | 13,8 | 13,8 | 13,8 | 13,8 | V |
| Power requirement c. | 300 | 300 | 300 | 400 | 120 | mA |
| Mast diameter | 58 | 58 | 58 | 58 | 58 | mm |
| Connectors | N | N | N | N | N | |
| Order No. | 26118 231.44 (224.70) EUR |
26100 231.44 (224.70) EUR |
26105 231.44 (224.70) EUR |
26110 338.15 (328.30) EUR |
26115 337.12 (327.30) EUR |
The TX/RX coax relais used feature 2KW power handling because of large contacts. The feature of a HF-VOX was averted due to problems expected with reliable functionality in this power range. The preamp goes into "on" status after connecting DC power supply. When switched "off" the MHP 145 is bypassed for low-loss transmit operations.
Attention:The MHP-145 does not have any protective circuits! Please pay attention to the delayed switch-on function of the PA.
The Diplexer is already built-in which requires only one connector each for the combination antenna and the feed-line.
Features: HF-VOX, max. power handling 100 Watt, separate FETs for 2m and 70cm band as well as steep band pass filters; this avoids the well-known intermodulation effects and does not exhibit any broadband receive functionality. Selectable voltage feed via coax cable or separate line.
| Technical Data | MHP-145 | DBA-270 | |
|---|---|---|---|
| Frequency range | 144-146 | 144-146 | MHz |
| 430-440 | MHz | ||
| Noise figure typ. | 0,5 | 1,3 / 1,5 | dB |
| Amplification typ. | 18 | 20 | dB |
| Max. Power | 1500 | 100 | Watt |
| Insertion loss | 0,1 | 0,2 / 0,4 | dB |
| Supply voltage | 13,8 | 13,8 | V |
| Power consumption ca. | 400 | 200 | mA |
| Connectors | N | N | |
| Order No. | 26120 421.68 (409.40) EUR |
26125 226.19 (219.60) EUR |
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.
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.
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 PL or N jacks. N version useable up to 3 GHz.
| Technical Data | DCC-12/PL | DCC-12/N | |
|---|---|---|---|
| Frequency range | 50...500 | 50...3000 | MHz |
| Insertion loss (150 MHz) | 0,1 | 0,1 | dB |
| Sizes | 37x37x30 | mm | |
| Connectors | PL | N | |
| Order No. | 26135 49.13 (47.70) EUR |
26136 52.32 (50.80) EUR |
|
gaAs-FET pre-amp without Tx/Rx switch, very low noise figure. Very stable also with impedance mismatch at input. Amplification depending on version c. 20dB. SLN-1700 suitable for Meteosat.
| Type | Frequency | Noise figure | Order No. |
|---|---|---|---|
| LNA-145 | 144-146 MHz | 0,4 dB | 26140 210.33 (204.20) EUR |
| LNA-435 | 430-440 MHz | 0,4 dB | 26145 210.33 (204.20) EUR |
| SLN 2300 | 2300-2400 MHz | 0,4 dB | 26150 234.63 (227.80) EUR |
| SLN 1300 | 1250-1300 MHz | 0,4 dB | 26155 234.63 (227.80) EUR |
| SLN 1700 | 1650-1700 MHz | 0,4 dB | 26160 234.63 (227.80) EUR |
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.
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