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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.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. Without a power supply all SHF pre-amps (MVV-xxx models) automatically switch to 'pass-through'. This prevents any damages to the amp when the power fails.Model MVV 144-VOX \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eFrequency Range 144-146 Noise \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eFigure typ. 0,6 - 0,9 \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eGain typ. 10 - 20 [1] \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMax. Power (VOX) 350 (SSB) \/ 200 (FM) \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMax. Power with Sequencer 750 (SSB) \/ 250 (FM) \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eInsertion Loss (TX) 0,3 \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eOperating Voltage 13,5 \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eCurrent c. 50 DC-Feed via a separate cable or over coax \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMax. Mast diameter 56 \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eConnections N Number of antennas 1\u003c\/strong\u003e\u003c\/h1\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":28737011941440,"sku":"4567873","price":202.6,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0223\/4803\/8208\/products\/mvv_144-vox_m.jpg?v=1570593713"},{"product_id":"mvv-1296-vox-mast-pre-amplifier-for-23cm","title":"MVV 1296 VOX Mast pre amplifier for 23cm","description":"\u003ch1\u003eT\u003cstrong\u003ehe MVV 1296-VOX mast pre-amp is a low-noise antenna pre-amplifier in a double-shelled housing. The outer housing made of ABS is weatherproof and suited for mast mounting. The inner metal housing ensures a high shielding factor against unwanted irradiation and protects the components of the amplifier against harmful environmental influences effectively.The MVV 1296-VOX has two stages to gain enough amplification for longer feed lines, also. The input stage is equipped with a low-noise microwave GaAs FET, the second stage uses a microwave IC (MMIC). The amplification is continuously adjustable, which helps to adjust to particular cable lengths. A three-circuit stripline filter provides the necessary preselection.The MVV 1296-VOX is equipped with UHF-capable print coaxial relays, which ensure a low-attenuation carriage of the transmission power. Transmit\/receive changeover is done via a PTT input or automatically by the integrated HF-VOX. With the protection circuit even in VOX operation a reliable transit\/receive changeover up to 180 Watt at SSB mode is guaranteed. The operating voltage is supplied either via a separate two wire line or by remote power via coaxial cable. If the transceiver does not already provide 12V voltage for powering a pre-amp via coaxial cable, then another Bias-T (Order No. 26137.23) for remote power supply is required. Delivery includes mast clamps.\u003c\/strong\u003e\n\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eTechnical Data Receive Pre-Amplifier MVV 1296 VOX\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003e Frequency Range 1240-1300 MHz \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eNoise figure typ. 0,8-1,2 dB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eAmplification typ. 22 dB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMax. Power (SSB) 180 Watt Max.\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003e Power (FM) 100 Watt Insertion loss \u0026lt; 0,5 dB transmit-receive-switching HF-VOX or PTT-controlled \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eSupply voltage 13,5 V \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003ePower requirement c. 200 mA \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMast diameter 56 mm \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eConnectors N\u003c\/strong\u003e\u003c\/h1\u003e","brand":"wimo","offers":[{"title":"Default Title","offer_id":28737012891712,"sku":"679865432","price":228.96,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0223\/4803\/8208\/products\/mvv_1296_vox.jpg?v=1558459752"},{"product_id":"mvv-2000-vox-pre-amplifier-2m-70cm-23cm","title":"MVV 2000 VOX Pre Amplifier 2m 70cm 23cm","description":"\u003ch1\u003e\u003cstrong\u003eWide band mast pre-amplifier for the amateur bands 2m, 70cm and 23cm, and with limitations also usable on 13cm. Good amplification factor of approx. 20 dB over the wide frequency range of 90 to 2000 MHz. This makes this pre-ampo also nicely suitable for broadcast listening, airband (incl. ADS-B!), DAB+ or DVB-T. When transmitting a VOX circuit detects the emitted power and switches the pre amp automatically off. But a wired PTT line can be used also. The max. allowed transmit power is 100 W SSB or 40 W FM. The insertion loss is approx. 0.5 dB at 435MHz. Connectors are N-type female, weatherproof mast mount enclosure incl. bracket for a max. mast diameter of 56mm. Power supply via coaxial cable or separate feed line. \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eTechnical Data MVV-2000VOX \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eFrequency Range 90 - 2000 MHz \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eNoise Figure typ. ca. 2.5 dB @ 1.3 GHz MdB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eAmplification ca. 20 dB HF power 100 W SSB 40 W FM \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eInsertion Loss 0,5 dB @ 435MHz \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eSupply Voltage 12-14 V \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003ePower Consumption 250 mA max. \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMast Diameter 56 mm\u003c\/strong\u003e\u003c\/h1\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":28737013219392,"sku":"2345674","price":199.95,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0223\/4803\/8208\/products\/mvv_2000_vox.jpg?v=1558459754"},{"product_id":"dba-270-dual-band-pre-amplifier-2m-70cm-144-146-430-440","title":"DBA 270 Dual band pre amplifier 2m 70cm 144-146  430-440","description":"\u003ch1\u003e\u003cstrong\u003eThe 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. \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eTechnical Data \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eFrequency Range 144-146 430-440 MHz \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eNoise figure typ. 0,5 0,7 MdB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eAmplification 20 24 dB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eHF-power 200 W SSB 100 W FM \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eInsertion loss 0,1 0,2 dB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eOperation voltage 12-14 V \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eCurrent consumption 250 mA \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch1\u003e\u003cstrong\u003eMast diameter 58 mm\u003c\/strong\u003e\u003c\/h1\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":28737014104128,"sku":"4567532","price":249.96,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0223\/4803\/8208\/products\/dba_270_dual_band_pre_amplifier.jpg?v=1558459756"}],"url":"https:\/\/www.pjbox.co.uk\/collections\/ham-pmr-446-antenna-accessories\/amateur-radio-ham-microphones-accessories.oembed","provider":"P J Box","version":"1.0","type":"link"}