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"Idiot's
guide" for RF
amplifiers
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Sooner or later you'll
find your self wondering "Isn't there a way to get more range?".
Sure there is, there are more actually. The best would be to improve
your aerial system, but sometimes this isn't possible for objective
reasons. It is also possible that you allready have very good aerial
as it is. You've got to increase your power....
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Universal bipolar power amplifier
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Click
on image for a full-size image!
Here
are a pic of a VK200 wideband choke and a table of transistors that you can stick
into this amplifier. Emitter leads of the power transistor have
to be kept at minimum (every single additional millimeter means
less gain and less output power). Use large (appropriate) heat sinks.
Do not strain transistors too much when you mount them, ceramics
can break. If you can't max the amp with shown trimmer caps, use
bigger values or add 10-22pF in parallel. Some coils might need
a winding more in some cases. Need printed circuit board for this?
See the table below to order the PCB...
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We
have a stock of
professional double-sided printed circuit boards (PCBs) and
the VK200 wideband choke for this amplifier. Note that there
is no support and troubleshooting provided, but you are free
to use the Forum.
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Express
PayPal purchase: amplifier PCB for your amplifier!
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Shipped
to US: US$ 29.99
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Shipped
to EU: US$ 19.99
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Click
the appropriate paypal link above, includes shipping!
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Amplifier
designs from Motorola (1Kw, 300W, 600W)
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Here are the 1KW
amp, 600W amp, 300W
and 150W amp and these
usefull datasheets; Amp1,
Amp2, Amp3,
Amp4. These are all extremely
valuable to any builder, have a look and enjoy.
Discuss this article
in our Forum!
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Some
general tips
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Earthing
straps, mounting and
PCB example.
Discuss this article
in our Forum!
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you like to maintain our guides and become famous? Want to write
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us with a bit of news about yourself today!
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