[Icom] Re:R9000 RECIVER TT-340

[Adam Farson]

Johnny, Dick,

Yes indeed - the IC-781 and the R-9000 both suffered from heat problems. The
power-supply heat problem in the IC-781 is a matter of concern. The power
supply uses a shunt regulator, and was designed for the Japanese 100V mains
supply. When connected to 120V mains, the power supply dissipation increases
by 20%. The heatsink was not designed for the additional thermal load;
consequently, the power-supply area runs very hot. This can lead to
component breakdown over time. Further reading:

http://www.icomamerica.com/support/troubleshooting/ic-781.html

Cooling-fan kits are available for both radios. On the Icom FAQ site
http://www.qsl.net/icom/ click "IC-781 & IC-R9000 Cooling Kits".

"We have learned" that Icom is developing a high-end DSP-based HF
transceiver to replace the IC-781 and IC-775. This radio will incorporate
technology licensed  from Rohde & Schwarz of Munich. The projected price of
the new radio will be in the $5K ~ $6K range.

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Icom FAQ site:
http://www.qsl.net/icom/

-----Original Message-----
From: icom-admin@mailman.qth.net [mailto:icom-admin@mailman.qth.net]On
Behalf Of Siu Johnny
Sent: Tuesday, October 08, 2002 19:14
To: icom@mailman.qth.net
Subject: Re: [Icom] Re:R9000 RECIVER TT-340


Hi Group members,

I share with Adam AB4OJ's view on some of the top line classic receivers
and transceivers.  Those rigs such as IC781 and R9000 were of high regard
even at today's market.  Perhaps, their high prices did give some respect.


I am not saying that they are not good.  However, with advancement in
telecommunciation technology and DSP components, modern rigs such as the
IC756 families are performing better and at a lower price.

One the other hand, if you are fond of rigs collection, these classic rigs
would be a good piece of art on your shack - sorry, it is a very subjective
judgement.

Both IC781 and R9000 suffered from overheat problems in the regular unit.
According to Icom Amercia, if you have any problem with these rigs, you
should check the regular unit first.

Fortunately, there are kits available for modification to overcome this
problem.  Please visit www.qsl.net/icom

73

Johnny VR2XMC