Ken,
I found this on the web, the pcb is shown in the pdf , looks ok,
single sided for the amp .....but may be with double sided board
could be more stable , as the op transistor is ok to 5 ghz .. for
the ae , linking both sides may work , save etching !
I've decided I cannot actually receive anything on 500/136 that is
out of ground wave range ! , when I first started on 500 Rx was fine ..
73 -G..
http://www.py2mg.qsl.br/Arquivos_PDF/pa0rdt%20whip.pdf
--------------------------------------------------
From: "Ken" <[email protected]>
Sent: Sunday, April 29, 2012 12:50 PM
To: <[email protected]>
Subject: RE: LF: BFQ19 SMT Collector pad
Hello Graham.
Can you remember the name of the web site where the layout was?, I did my
own layout but it was not all that successful when tested on 198kHz S/N
improved but no increase in level, although this may have been because I
wound two 20mH inductors for the power feed and may have been too greater
inter-winding capacitance, for use on VLF.
73s
Ken
M0KHW IO91TV
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Graham
Sent: 29 April 2012 10:52
To: [email protected]
Subject: Re: LF: BFQ19 SMT Collector pad
Ok , Tnx , Roelof,
I thought that may be the case, but before doing it , best to ask ...
I have a pcb layout (from web) for a mini-whip Ae and after your
post
, that the bfq19 is a better option, was going to alter the track to
take the surface mount device, would need to be on the track side
of
the board. At 1.5 mm pitch will not be that simple !
Q there a commercial PCB available ?
73 -G.
--------------------------------------------------
From: "Roelof Bakker" <[email protected]>
Sent: Sunday, April 29, 2012 10:35 AM
To: <[email protected]>
Subject: Re: LF: BFQ19 SMT Collector pad
Hello Graham,
I use them a lot and yes, you can solder the collector tap, which is
preferred for better heat transfer.
For best contact, I solder both sides of the collector.
73,
Roelof, pa0rdt
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