[Lowfer] VLF active antenna

[Mitch Powell]

Looks like it

quote
NPN transistor in a SOT89 plastic envelope intended for application in thick and thin-film circuits. 
It is primarily intended for use in UHF and microwave amplifiers such as in aerial amplifiers, radar systems, oscilloscopes, spectrum analyser unquote



On 2010-12-17, at 9:10 PM, LEE BAHR wrote:

> Are all BFQ19 and BFQ149 transistor surface mount?
> 
> Lee, w0vt
> 
>> 
>>> 
>>> Just for telling you that i have build your Complementary Push-Pull
>>> Amplifier Active Antennas the one with the Complementary Push-Pull Input
>>> Stage at Fig. 5 and that it work verry well for me, even at 5 farenheit 
>>> :)
>>> 
>>> http://www.home.earthlink.net/~christrask/Paper007.html
>>> 
>>> If i read you correctly the the OIP3 and OIP2 is +44.25dBm and +68.5dBm
>>> and it can be further improved by way of using higher current devices
>>> such as the BFQ19 and BFQ149 for the output devices. Have you made the
>>> OIP3 and OIP2 mesurement with these BFQxx transistors.
>>> I am on my way to buil an other one and i will probably build it with the
>>> BFQxx transistor.
>>> 
> 
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