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RF Antenna Booster Premplifier
If your location or space limitation prevents you from having a 100ft or longer antenna then this amplifier will allow you to use a 15ft or so antenna.
If you live in a rural area and need a long antenna to receive AM stations on your crystal radio then this amplifier is for you .I live about 20 miles from the nearest AM station and even with a 15ft antenna I can barley get one station. With this amplifier and a 15ft antenna I get three stations.
These are made by me with my own secret circuit design. It is not as Pretty as the $100.00 Active Antenna Boosters but with the addition of the optional ferrite antenna output coil it will work using the same coupling method however the operating frequency will be only about 5Mhz.
Broadband amplifiers will have a little more noise than a narrow band amplifier. However unlike the $100.00+ units for a few dollars you can add a tuned input known as a pre tuner and make it narrow band as the input is assessable and not molded in a plastic case.
Frequency response 25 to 30Mhz.
Voltage gain is up to 10 to 30 times for AM radio band and about 2 - 5 times for 25Mhz with direct connection inductively wrapping about 3-4 turns around your built in ferrite AM antenna tuning coil.
The battery only draws about 2ma current. So a 9 Volt battery will last a very long time. Over 80 hours continuous use.
Many people put audio amplifiers on there crystal radio sets. However it takes about .1 volt for the diode to conduct so stations not able to produce at least .1 volt from antenna do not pass into the audio amplifier so hundreds of times audio amplification times nothing equals nothing.
Comes with directions to connect with just about any crystal radio. All units tested before shipment.
Uses my own circuit design developed by me. It has not been copied or taken from another circuit and I have never seen one like it anywhere.
You need a 9 volt battery and wire for the antenna and ground.
For None
Continental USA Shipments on orders under $50.00
Buy This Extra Shipping and Handling charge $3.00
For none USA Shipments on orders over $50.00 Email me for shipping charges.
OPTIONAL Insurance
and Delivery Conformation for USA ONLY Buy Here $3.00
Buy Insurance and Extra Shipping one time per order not each Item.
Part # RFamp RF Amplifier for AM and crystal radios
$39.95
Part# RFamp-wall Above amplifier with Wall
Transformer instead of 9 volt battery. $47.95
Optional Ferrite Output Coil for the RF amplifier $6.95 . This is not used as as antenna but as a coupling means. Do not purchase the Ferrite Rod thinking it will do something by its self. If you can not or do not have access to the tuning coil in your set or you receiver has no antenna inputs then you may need this option. This is not a common ferrite loopstick antenna coil but is made special for output coupling.
No picture yet but a ferrite rod with 2 wires coming from it.
Part# FC-Output Ferrite Antenna Output
Coupling Coil. $6.95
Visitors
contact me at slowe15@cinci.rr.com
Line card 1N34(A) 1N34A 1N60 1N270 1N277 1N3819 1N914 3N211 3SK88 40673 741 LM741 UA741 7805 7805A 8086 8088 BAT46 BF960 BF961 BF981 BF998 Ceramic ( Crystal ) Earphone Ferrite Loopstick Antenna Coil LM1458 1458 UA1458 LM324 324 LM386 LM555CN 555 LM555 LM555C MAR6 MAR-6 MFE201 MK484 MPF102 MVAM108 MVAM109 NE602 NE602A NE602AN SA602 SA602A SA602AN PN2222A PN2907A 2N4401 2N4403 2N3904 2N3906 2N2222 2N2222A MPF102 2N3819 KSP10 MPSH10 2SC2570 2SC2570A 2SC2498 Variable Capacitors