Good info Lee...thanks for the support!
Cecil
K5DL
Sent from my iPad
> On Mar 1, 2020, at 9:36 PM, Lee STRAHAN <k7tjr@msn.com> wrote:
>
> Hi Guys,
> I got advance information of the 2N5109 and its cousin the 2N3866
> transistors demise. I used the 2N3866 in my older design Hi-Z 75 ohm preamp
> so this transistor should suffice in most preamps that used the the 2N5109 .
> I bought a good supply of the 2N3866 devices and can offer them up to the ham
> community for $3.00 each in small quantities. I intend to support hams that
> are in need of these devices in small quantities only which should prolong
> the lives of the ubiquitous single transistor feedback preamp such as the
> HI-Z and the W7IUV.
> I am not selling these transistors through Hi-Z Antennas but through
> private sales. E-Mail through k7tjr@msn.com or address below. There is no
> profit to me involved. There will be postage costs involved also.
>
> Also do not buy the Motorola labeled 2N3866 or 2N5109 devices from China
> as they are nothing more than audio transistors at best. I tried them.
>
> Lee K7TJR
> 8125 SW Larch Dr.
> Culver, OR 97734
>
>
>
> -----Original Message-----
> From: Topband <topband-bounces+k7tjr=msn.com@contesting.com> On Behalf Of
> Richard (Rick) Karlquist
> Sent: Sunday, March 1, 2020 3:31 PM
> To: VE6WZ_Steve <ve6wz@shaw.ca>; Topband <topband@contesting.com>
> Subject: Re: Topband: 9 circle RX array combiner board
>
>
>
>> On 3/1/2020 2:22 PM, VE6WZ_Steve wrote:
>> Just like some guys enjoy woodworking and making furniture that they may not
>> really need, I like to build radio things just for the fun of the project
>> even though I may not really “need” it. For three years I have been using
>> the original 9 circle RX array kit that I bought from DX-engineering, and it
>> has performed well, but I wanted to build my own and add my own design
>> tweaks.
>>
>> Using KiCad, I have designed and built a 9 circle RX array combiner with a
>> 2N5109 pre-amplifier integrated onto the same board.
>>
>
>> 73, de steve ve6wz
>> _________________
>>
>
> Now I know why you work stuff I can't even hear :-)
>
> The 2N5109 is just about extinct. Did you secure a source for it before you
> laid out your PC board? If you did, please share it with the rest of us.
> Most people are now using substitutes for the 2N5109 with varying degrees of
> success. Are you possibly doing that? Of course those substitutes are not
> in a hermetic metal can, so the PC board has to be laid out for differently
> for them.
>
> You might want to look at these references for so-called "E-field" arrays of
> whip antennas:
>
> A military design:
>
> https://www.dst.defence.gov.au/sites/default/files/publications/documents/DST-Group-TR-3522.pdf
>
> Various improvements to the above:
>
> http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
>
> You also find a lot of other good stuff on Chris's site.
>
> They go beyond the DXE design.
>
> Good luck with your project.
>
> BTW, how do you like KICAD? I'm currently using a grandfathered EAGLE 7.7
> perpetual license, but "some day" I might switch to KICAD.
>
> 73
> Rick N6RK
> _________________
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