[Icom] RE: One last question on R8500 !

Sun, 15 Jun 2003 20:34:56 -0400

Scott:

Please let me know if you need info on identifying where the components
are located on the PC Board.

    Ted

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Scott Schappert
Sent: Sunday, June 15, 2003 2:53 PM
To: [email protected]
Subject: RE: [Icom] RE: One last question on R8500 !

Ted,

Thank you very much.  I guess I have not lost it all.  One thing though,
the
inductors are L53 and L6.  With the print so small...  Taking out SMT
components is easy.  Conversely, installation is non-trivial.  I thought
about the SD 550.  As it is inexpensive, I may splurge to purchase one
of
them should I find the spectrum analyzer performance limitations
irritating.

Finally, I just wanted to comment on how great the QTH reflectors are.
And
you, my friend, and other who selflessly give wisdom, and cast reason on
the
imbalanced.  Thank you, Ted.  I may be calling on you again.

Kindest regards, 

-Scott

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Ted Marston
Sent: Sunday, June 15, 2003 8:18 AM
To: [email protected]
Subject: [Icom] RE: One last question on R8500 !

Scott:

I'm happy to help you.

Remove one of the following items:   1. both L58 and L6 (they are each
100 uH and are in parallel),  2. R515 (1 ohm, or zero ohm jumper),  or
3. Q5 (2SC3650, P/O 9 Volt Regulator for the TV 10.7 MHz IF/DC Output
function only).  Removal of anyone of these components will do the job
for you.

These are surface mount components, and if you don't feel comfortable
working with them, you may want to seek some assistance from an
electronics technician/engineer that is.

If the deal on the Spectrum Analyzer falls through you may want to
consider the AOR SD-5500 Spectrum Display Unit.
http://www.aoruk.com/sdu5500.htm  It will do much more than the Spectrum
Analyzer with the R-8500.

Let me know if you have any other questions.

   Good luck, Ted

-----Original Message-----
From: Scott Schappert [mailto:[email protected]] 
Sent: Saturday, June 14, 2003 10:39 PM
To: 'Ted Marston'
Subject: One last question on R8500 !

Ted,  

I hope you do not mind me contacting off the reflector, but I was
looking at the schematics in regards to the IF output, and was curious
about one thing.  If you have access to the schematics, it appears that
there are two biasing voltages, one from a +8 VDC and one, with a
voltage divider from a +13.8 source.  Before I go off thinking I know
what I'm doing, IF you have access to the schematics, could you clarify
that the +13.8 VDC input is the 9 VDC feed choke (??), and if so, where
would the best place be to remove DC from the IF output ?  Please
forgive my meager knowledge of RF, as my disciplines have changed since
college !

Thanks for any further knowledge gleaning !

-Scott Schappert
Molecular Inversion Dynamics

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Your Moderator: Dick Flanagan W6OLD, [email protected]
Icom Users Net: Sundays, 1700Z, 14.315 MHz
Icom FAQ: http://www.qsl.net/icom/