Good info Lee...thanks for the support! Cecil K5DL
Sent from my iPad > On Mar 1, 2020, at 9:36 PM, Lee STRAHAN <[email protected]> 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 [email protected] 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 <[email protected]> On Behalf Of > Richard (Rick) Karlquist > Sent: Sunday, March 1, 2020 3:31 PM > To: VE6WZ_Steve <[email protected]>; Topband <[email protected]> > 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 > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
