[1000mp] Adjusting the MP's RF output/speech processor settings
Ronald Walters
[email protected]
Tue, 29 Oct 2002 04:51:42 -0500
Mike,
You need to do a mod to the rig, simple in fact. Here's the solution: See
attached. Solved the problem at this end, now the power adjustment is very
smooth without spikes. Newer rigs from around 97/98 and on do not need this
mod.
73's
Ron W4LDE
----- Original Message -----
From: "Mike Gilmer, N2MG" <[email protected]>
To: "1000mp List" <[email protected]>
Sent: Monday, October 28, 2002 15:16
Subject: [1000mp] Adjusting the MP's RF output/speech processor settings
> I have a used, but new-to-me, 1000MP. This weekend, for the first time
> since I've owned it, I seriously used the MP on phone with an amplifier
> (in CQWW). I found the MP a difficult beast to tame when using its
> speech processor - it seemed very hard to adjust the MP's power output
> level such that the amp's grid protection circuitry would be happy. I
> either had a scant 800W out with very reasonable grid current or, after
> tweaking the rf output a touch (just a few degrees of rotation - VERY
> hard to do), I was overdriving the amp to the point that the protection
> would trip. On CW or with a TS-940 I experience no such problem. I
> read the manual, but it did not help - perhaps I misread it, but it
> actually seemed to mistate somewhat the relationship of the
> mic/processor/RFout controls.
>
> Any ideas - or is this just another way of indicating that CW is the
> better mode? ;-)
>
> 73 Mike N2MG
> _______________________________________________
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From: Lynn D. Osterbur <[email protected]>
To: [email protected] <[email protected]>
Subject: [[email protected]: [Yaesu] FT-1000MP RF Power Mod -- =
Do-it-yourself instructions]
Date: Saturday, October 25, 1997 11:53 PM
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Begin forwarded =
message =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
From: [email protected] ("Robert A. Wilson ")
To: [email protected]
Subject: [Yaesu] FT-1000MP RF Power Mod -- Do-it-yourself =
instructions
Date: Mon, 14 Apr
=20
The Rig: Yaesu FT-1000MP (new units may not have this =
problem)
=20
The Problem: When the RF speech processor is activated, =
adjustment of the
the "RF PWR" control becomes very critical -- =
output power can
jump from 40 watts to 100 watts when the control is =
rotated
only a few degrees.
=20
The Solution: Add a jumper wire and cut a trace (detailed =
instructions below)
=20
Disclaimer: I am not a Yaesu service technician. The =
modification
described below was shown to me at the 1997 Fresno DX
Convention by "Winston" of Yaesu service, but NO ONE =
AT
YAESU HAS REVIEWED THESE INSTRUCTIONS.
=20
If you mess up your radio attempting to install =
this
modification yourself, do not blame me or anyone at =
Yaesu.
All responsibility lies solely with you. If in =
doubt, send your rig to
Yaesu.
=20
The good news: I installed this mod on two FT-1000MPs, and it =
worked fine.
I have not noticed any unwanted side-effects.
=20
What you need:=20
1. Good eyesight
2. Steady hands
3. A small soldering iron, and experience using it
4. About 6 inches (15 cm) of No. 24 or 26 AWG insulated =
wire
5. Metal tweezers or forceps
6. A small knife with a sharp tip for cutting one trace
=20
If you do not have ALL of the above, you should not proceed any =
further.
=20
The wire size is critical. Anything larger will not fit into the =
tiny holes
in the circuit board. Radio Shack stocks only ONE kind of wire this =
small:
Cat. No. 278-857, 2-conductor "Rainbow Wire." Only one conductor is =
used; I
unzipped the tiny "zip cord" to get the length I needed. If you =
have No. 26
insulated wire around, use it instead.
=20
Detailed Instructions Follow (print with fixed-pitch font, such as =
Courier)
=20
1. Remove top cover
=20
2. Remove bottom cover
=20
3. Orient the radio so that unit is upside down (bottom side up), =
and
the rear of the radio is nearest to you. The circuit board that =
will
be modified is the "AF Unit," which is in the lower left corner.
It has a shiny shielded metal box in the middle.
=20
FT-1000MP
Bottom View
=20
Front
=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D+
| |
| |
| |
| |
| |
| |
| _________ |
|| AF | |
|| Unit | |
||_________| |
=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D+
Rear
=20
=20
4. Locate diode D3023 in the lower left corner of the AF Unit, about
1 inch (2.5 cm) from the left and 1 inch from the rear. Just =
below it
(nearer to the rear) is a small trace that runs right to left, =
terminating
in a small solder "island." The trace is completely surrounded =
by a wide
metal trace. The island has a small "through-hole" in the center =
that is
filled with solder, but has no visible components. The island is =
completely
"in the clear." Do not confuse this with the island immediately =
UNDERNEATH
D3023.
=20
=20
AF Unit (lower left corner)
=20
|
|
| D3023
| -=3D=3D-
| wide metal
| area |
| |
| /--------------/
| ( ()=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D <--- Narrow trace =
terminating in solder island
| \--------------\ Jumper will be soldered to this =
island and
| | trace will be cut
| wide metal |
| area
|
|_____________________________
=20
=20
5. Locate trim-pot (variable resistor) VR3011, labeled "AM", near =
the top
left center of the AF Unit. It is white, square, and clearly =
labeled,
and "in the clear"
=20
=20
AF Unit (top left center)
______________________________________
|
| VR3011
| +----+
| | |
| +----+ <--- jumper will be soldered to =
this leg
| AM
|
|
|
|
=20
6. Cut a length of No. 24 or No. 26 insulated wire long enough to =
reach from
the solder island near D3023 to the lower right corner of VR3011. =
Strip
3/16 inch (5 mm) of insulation from each end.
=20
7. Important: Tin both ends with solder. You just want a thin coat =
-- no
"blobs"
=20
8. This is the hardest step. If you can get through this, the rest =
is easy.
=20
Point the tip of the wire into the center of the solder island =
using
tweezers or forceps. Heat the WIRE with a soldering iron until =
it melts
the solder in the through-hole, then push the hot wire into the =
hole and let
it cool.
=20
When soldering, be careful not to touch other wires with the =
soldering iron.
Do not push too much bare wire into the hole, just enough to make =
a good
connection to the through-hole.
=20
It may be helpful to pull back a little more insulation before =
soldering,
then push the insulation back down after soldering.
=20
Make sure there are no solder blobs shorting to the surrounding =
traces.
=20
9. Tin the lower right leg of VR3011 with a little solder, then =
solder the
other end of the jumper wire to this leg. Do not use too much =
heat.
=20
10. Using the tip of a sharp knife, gently cut the small trace =
leading to the
solder island as shown below. You do not have to cut too deep, =
but
be sure the cut is wide enough and that there are no shorts to =
surrounding
traces:
=20
AF Unit (lower left corner)
=20
|
|
| D3023
| -=3D=3D-
| wide metal
| area |
| |
| /--------------/
| ( ()=3D=3D=3D=3D=3D\ \=3D=3D=3D=3D <--- Cut trace as shown
| \--------------\
| |
| wide metal |
| area
|
|_____________________________
=20
11. Re-install bottom cover and top cover
=20
12. Turn on the radio and verify that the RF PWR knob now controls =
output
power smoothly, both with and without the speech processor =
active.
=20
Good luck everyone.
=20
73,
Bob Wilson, N6TV
[email protected]
=20
--
FAQ on WWW: http://www.primenet.com/~ke7gh/yaesu.html
Submissions: [email protected]
Administrative requests: [email protected]
Problems: [email protected]
=20
=20
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