Description
Hoë versterking 35W VHF wyeband versterker
This 35W pallet amplifier covers wide frequency range with no adjustment and offers very high gain necessary for DAB+ and other applications even at VHF BAND I, VHF BAND III and even UHF TV. It can produce full output power from just a few milliwatts of drive power over very wide frequency range. More drive is required below 80MHz and above 250MHz, but the board is still very useful. This makes it extremely versatile and practical whenever you lack a little bit of drive power or gain in your applications. We always keep a few at hand and use them a lot in all kinds of applications from FM radio to VHF TV, STL links, DAB+ transmitters and UHF TV.
Each pallet amplifier we sell is designed and tested using vector network analyzer and spectrum analyzer. Our amplifier products are manufactured using an automatic surface mount assembly process. This pallet is optimized for 48-63V operation and is a perfect driver for new LDMOS devices which work with these high voltages. Using a lower voltage will result in lower output power. It will operate down to about 30 volts with reduced output. RF output power can be adjusted by lowering the supply voltage or reducing the drive. Bias can be adjusted with a trimmer and is thermally stabilized. Bias is preset in the factory. For high-linearity applications please increase bias current as needed. The pre-driver high gain circuit is operating in linear mode always.
Soos met enige palet sal jy 'n koelbak, kragtoevoer en filter nodig hê om dit te gebruik. Meer inligting is beskikbaar in die ingeslote versterker se datablad.
As gevolg van hoë aanwins kan die 35W palette feitlik van die DAB+ DDS aangedryf word, 'n isolasie stadium en afskerming word aanbeveel vir stabiliteit. Feitlik enige bron wat jy jou kan voorstel, sal sterk genoeg wees om hierdie paletversterker aan te dryf.
When using high-gain version with on-board pre-amplifier you also need an additional 8V DC mains power supply for the pre-driver stage.
Tegniese spesifikasies:
– Frequency range: 80-250MHz, is useful even below 80MHz at well into UHF with reduced gain
– Inset/uitset impedansie: 50 ohm
– Pout recommended: 35W @100MHz (50V, CW)
– Pout max: 10-15W @200MHz (63V, DAB+)
– Maksimum uitstoot: >50W@65V
– Drive power required: ~10mW (high gain model, monitor output to avoid overdriving)
– Drive power required: ~100-200mW (regular model, monitor output to avoid overdriving)
– Main power supply: 40-63Vdc: ~1.5A max (DO NOT EXCEED 65V)
– Pre-driver power supply: 8V DC, 150mA
- Versterking sonder voorversterkerstadium: 25-28dB
- Wins met voorversterker stadium: ~35-40dB
– Geen vooroordeelverstellings of RF-stroombaaninstelling is nodig nie.
– Grootte: 46x49mm, 20mm hoog
Geskikte hoofkragtoevoer is hier.
Waarskuwing: Do not exceed maximum supply voltage of 63V or damage will occur to the on-board operational amplifier.
Nota 1: Gebruik asseblief PTFE koaksiale kabel vir RF-invoer (RG178 is perfek) en uitset (RG178 of RG142 is perfek) verbindings, dit maak dit moontlik om baie kort leidings te hê sonder om die koaks te verbrand. Hou die koakseerleidings so kort as moontlik (minimums hoogstens). Hou ook leidings kort op verbindings, dit N vroulike flens vir RG142 of .141 semirigid – maklike installasie is perfek!
Nota 2: 'n Klein heatsink is beslis nodig!
Nota 3: Daar is tekens van soldering op elke bord. Dit is as gevolg van toetsing (tydens toetsing is koaksiale kabel aangeheg).
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