Message-ID: <6A6E073DF810425DAD6D7D50DF71BC38@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <28E264A70BC6433AB06D915D0EAFB8B9@AGB> <op.wdisxbkcyzqh0k@pc-roelof> <2BB37ECFB44044EFACB44777CD3A2963@AGB> <1C53C5D0C2994BE792CED0AD217ADB76@lindavideo>
In-Reply-To: <1C53C5D0C2994BE792CED0AD217ADB76@lindavideo>
Date: Sun, 29 Apr 2012 13:02:04 +0100
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Subject: Re: LF: BFQ19   SMT   Collector  pad  
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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" <ken.h.wright@btinternet.com>
Sent: Sunday, April 29, 2012 12:50 PM
To: <rsgb_lf_group@blacksheep.org>
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: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Graham
> Sent: 29 April 2012 10:52
> To: rsgb_lf_group@blacksheep.org
> 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" <roelof@ndb.demon.nl>
> Sent: Sunday, April 29, 2012 10:35 AM
> To: <rsgb_lf_group@blacksheep.org>
> 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
>>
>
>