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I notice that emitter follower but it seem to be working.
Every time I send an update command, the CAT indicator come on and I get =
a data string on SO. Sig levels look normal but...the timing is what =
worries me. As explained, the shortest data element in the SO is below =
2.2ms For a 4800 BR signal the shortest element should be the inverse of =
4800 (1/4800).
Was hopping to work on my radio this week end but my honey to do list =
was tooo long hi
Thanks for the comments, appreciate it! That's good ham operators =
spirit!!
73 de KP3G
----- Original Message -----=20
From: Ron Pierce=20
To: Jose (Cheg=FCi) Torres=20
Sent: Saturday, January 26, 2002 10:58 AM
Subject: RE: [Yaesu] ft990 comm problem
Bretts' post got me to thinking. #1 there is no Line Driver/Receiver =
Chip. But there is a transistor used for Txd. BTW just to confuse =
things Yaesu uses SO/SI - Cat Out/Cat In- Txd/Rxd interchangeably.=20
On the control unit there is a transistor Q5017 / 2SC945AQ. NPN wired =
in an emitter follower configuration.=20
Voltages are supposed to be :
Collector 5v
Base 4.9v
Emitter 4.5v
Good luck
Ron
NI=D8L
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>I notice that emitter follower but it =
seem to be=20
working.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> </DIV>
<DIV><FONT face=3DArial size=3D2>Every time I send an update command, =
the CAT=20
indicator come on and I get a data string on SO. S</FONT>ig levels look =
normal=20
but...the timing is what worries me. As explained, the shortest data =
element in=20
the SO is below 2.2ms For a 4800 BR signal the shortest element =
should be=20
the inverse of 4800 (1/4800).</DIV>
<DIV> </DIV>
<DIV>Was hopping to work on my radio this week end but my honey to do =
list was=20
tooo long hi</DIV>
<DIV> </DIV>
<DIV>Thanks for the comments, appreciate it! That's good ham=20
operators spirit!!</DIV>
<DIV> </DIV>
<DIV>73 de KP3G</DIV>
<DIV> </DIV>
<DIV></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dni0l@indytel.com href=3D"mailto:ni0l@indytel.com";>Ron =
Pierce</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dkp3g@isla.net=20
href=3D"mailto:kp3g@isla.net";>Jose (Cheg=FCi) Torres</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, January 26, =
2002 10:58=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [Yaesu] ft990 comm =
problem</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Bretts' post got me to thinking. #1 there is no Line=20
Driver/Receiver Chip. But there is a transistor used for Txd. =
BTW just=20
to confuse things Yaesu uses SO/SI - Cat Out/Cat In- Txd/Rxd =
interchangeably.=20
</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff size=3D2>On=20
the control unit there is a transistor Q5017 / 2SC945AQ. NPN =
wired in an=20
emitter follower configuration. </FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Voltages are supposed to be :</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Collector 5v</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff size=3D2>Base=20
4.9v</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Emitter 4.5v</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff size=3D2>Good=20
luck</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Ron</FONT></SPAN></DIV>
<DIV><SPAN class=3D530044814-26012002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>NI=D8L</FONT></SPAN></DIV></BLOCKQUOTE></BODY></HTML>
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