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Content preview: But what are you sending with the reduced power rig ? SSB
... Normal CW Opera all have low duty cycles and result in low heat build
up But if you running at 100% key down sending qrss and the like , then ,
yes the rig will heat up , in the early days I always though wspr should of
been named Icarus , with the number of thermal run a ways caused by 100%
duty over 120 seconds ( not a problem at Hf where power levels are low, but
down here at 1:400 efficiency's = a lot of heat) [...]
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Subject: Re: LF: TRANSVERTERS
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But what are you sending with the reduced power rig ?
SSB ... Normal CW Opera all have low duty cycles and =
result in low heat build up
But if you running at 100% key down sending qrss and the =
like , then , yes the rig will heat up , in the early days I =
always though wspr should of been named Icarus , with the =
number of thermal run a ways caused by 100% duty over 120 seconds =
( not a problem at Hf where power levels are low, but down here =
at 1:400 efficiency's =3D a lot of heat)
The rig will have a class AB1 or similar PA with high =
standing bias to reduce cross over distortion =3D splatter on ssb =
, so standing dissipation will be high ..not much you can do ... =
add a fan to cool the heat sink , but be careful of the thermal =
gradients , out side cold , wont mean inside is also at the right =
temp ..may still be very hot , if parasitic 'ambient' cooling =
is part of the equation and the fan is only cooling the last =
part of the heat path ..
73 -G..
From: mal hamilton=20
Sent: Tuesday, November 06, 2012 4:45 PM
To: rsgb=20
Subject: LF: TRANSVERTERS
RIG/TRANSVERTER HEAT
I have noticed when running a Transceiver at low power for Transverter =
or other use the Transceiver PA gets very HOT so it would appear that =
this is an inefficient approach except the Transceiver has a dedicated =
low power output.
I was wondering what system was used to reduce this power. It would be =
better to disable the PA and take the output from the driver stage.
It is vy noticeable on an IC-706
de G3KEV
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charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.19328">
<STYLE></STYLE>
</HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
id=3DMailContainerBody leftMargin=3D0 topMargin=3D0 bgColor=3D#ffffff=20
CanvasTabStop=3D"true" name=3D"Compose message area">
<DIV>But what are you sending with the =
reduced=20
power rig ?</DIV>
<DIV> </DIV>
<DIV>SSB ... Normal CW =
Opera =20
all have low duty cycles =
and =20
result in low heat build up</DIV>
<DIV> </DIV>
<DIV>But if you running at 100% =
key =20
down sending qrss and the like =
,=20
then , yes the rig will heat up , in =
the =20
early days I always though wspr should =
of =20
been named Icarus , with the =20
number of thermal run a ways caused =
by 100%=20
duty over 120 seconds ( not a problem at =
Hf=20
where power levels are low, but down =
here =20
at 1:400 efficiency's =3D a lot of =
heat)</DIV>
<DIV> </DIV>
<DIV>The rig will have a class AB1 =
or =20
similar PA with high standing bias =
to =20
reduce cross over distortion =3D splatter on =
ssb ,=20
so standing dissipation will be high ..not =
much you can do ... add a fan =
to =20
cool the heat sink , but be careful of the =
thermal =20
gradients , out side cold , wont mean inside is=20
also at the right temp ..may still =
be=20
very hot , if parasitic 'ambient' cooling =
is =20
part of the equation and the fan is only =
cooling =20
the last part of the heat path ..</DIV>
<DIV> </DIV>
<DIV> 73 -G..</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A=20
title=3D"mailto:g3kevmal@talktalk.net CTRL + Click to follow link"=20
href=3D"mailto:g3kevmal@talktalk.net">mal hamilton</A> </DIV>
<DIV><B>Sent:</B> Tuesday, November 06, 2012 4:45 PM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb</A> </DIV>
<DIV><B>Subject:</B> LF: TRANSVERTERS</DIV></DIV></DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial> RIG/TRANSVERTER =
HEAT</FONT></DIV>
<DIV><FONT face=3DArial>I have noticed when running a Transceiver at low =
power for=20
Transverter or other use the Transceiver PA gets very HOT so it would =
appear=20
that this is an inefficient approach except the Transceiver has a =
dedicated low=20
power output.</FONT></DIV>
<DIV><FONT face=3DArial>I was wondering what system was used to reduce =
this power.=20
It would be better to disable the PA and take the output from the driver =
stage.</FONT></DIV>
<DIV><FONT face=3DArial>It is vy noticeable on an IC-706</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>de G3KEV</FONT></DIV>
<DIV> </DIV></BODY></HTML>
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