RF MODULE information.
update: 25-05-2003.
Warning!
It's possible that there are
some errors!
I do NOT feel responseble for that!
mode all = FM/SSB.
P.in = Power
input (watts).
P.out = Power ouput (watts).
datasheet = technical details (Click on it!).
READ HERE: copyright © 2001 Cor PD0RKC.
|
type
|
freq.
|
P.in | P.out |
mode
|
datasheet
|
|
M57704M
|
430MHz
|
0,2
|
13
|
?
|
|
|
M57716
|
430MHz
|
0,2
|
17
|
all
|
|
|
M57719L
|
145MHz
|
0,2
|
14
|
?
|
|
|
M57719N
|
145MHz
|
0,2
|
14
|
?
|
|
|
M57721M
|
430MHz
|
0,01
|
7
|
?
|
|
|
M57726
|
145MHz
|
0,3
|
43
|
?
|
|
|
M57727
|
145MHz
|
0,3
|
37
|
?
|
|
|
M57729
|
430MHz
|
0,3
|
30
|
?
|
|
|
M57745
|
430MHz
|
0,3
|
33
|
?
|
|
|
M57762
|
1.2GHz
|
1
|
18
|
all
|
|
|
M57788M
|
430MHz
|
0,4
|
45
|
?
|
|
|
M57788MR
|
430MHz
|
0,4
|
45
|
?
|
|
|
M67711
|
1.2GHz
|
1
|
16
|
?
|
|
|
M67715
|
1,2GHz
|
0,01
|
1,2
|
all
|
|
|
M67727
|
145MHz
|
0,5
|
60
|
all
|
|
|
M67728
|
430MHz
|
10
|
55
|
all
|
|
|
M67746
|
145MHz
|
0,3
|
60
|
?
|
|
|
M67748L
|
145MHz
|
0,02
|
7
|
?
|
|
|
M67748LR
|
145MHz
|
0,02
|
7
|
?
|
|
|
M67749M
|
430MHz
|
0,02
|
7
|
?
|
|
|
M67749MR
|
430MHz
|
0,02
|
7
|
?
|
|
|
M67749LR
|
430MHz
|
0,02
|
7
|
?
|
|
|
M67755L
|
145MHz
|
0,002
|
7
|
?
|
|
|
M67781L
|
145MHz
|
0,3
|
40
|
?
|
|
|
M67798LA
|
145MHz
|
0,02
|
8
|
?
|
|
|
M67798LRA
|
145MHz
|
0,02
|
8
|
?
|
|
|
M67799MA
|
430MHz
|
0,02
|
7,5
|
?
|
|
|
M68712N
|
145MHz
|
0,02
|
2
|
?
|
|
|
M68719
|
1,2GHz
|
0,1
|
16
|
?
|
|
|
M68731L
|
145MHz
|
0,05
|
7
|
?
|
|
|
M68731N
|
145MHz
|
0,05
|
7
|
?
|
|
|
M68750
|
145MHz
|
0,2
|
27
|
?
|
|
|
M68751R
|
430MHz
|
0,2
|
27
|
?
|
|
|
M68769L
|
430Mhz
|
0,3
|
45
|
?
|
|
type
|
freq.
|
P.in
|
P.out
|
mode
|
datasheet
|
|
S-AV7
|
145MHz
|
0,2
|
33
|
FM
|
|
|
S-AV17
|
145MHz
|
0,4
|
60
|
FM
|
Repair your power module! (at your own risk!!!).
Becarefull
with your module, do not put your screws to tight on the
module, if the screws
are too tight, your metal (from the module) will be like a half circle (when
it's hot), so the heat can not dissapeare!!!!
Remove old white silicone grease, make the earia as clean as possible!!!!!
Also do not use much white silicone grease, it will dry out (when it's hot),
so again the heat can not dissapeare.
Put the white silicone grease, only in the holes, or scratches.
white silcone grease is toxic, wash your hands when the work has been done!.
Renember: white
silicone grease, and broken RF power parts are verry toxic!!! (it can kill you!).
warning:
do not damage the electronic parts in your module,
the toxic is verry dangerous it can kill you!!!
Defects VHF output stage
Some time ago the
unit did give hardly any power in the 2m band.
The tip of Hans (DC7OU) lead to a solution.
He reported that the VHF powermodule frequently fails in this type of unit,
and that you could try to repair it yourself.
A S-AV17 from Toshiba
is used in the VHF final amplifier.
After removal of the upper cover you can see it in the middle of the unit.
Diagram of the 2m of output stage module Toshiba S-AV17
After
unscrewing the screening hood the module can be soldered loose.
The plastic body is only clicked onto the unit and rests onto the ceramic substrate.
Now the module is open, you can examine and/or test the unit.
Pay special attention to small cracks in the tracks, which may mean interruptions
of the tracks.
The sealing compound protecting the bond-wires of the two transistors is
not solid, but jelly-like, so make sure you handle the module carefully.
The 2m output stage module without housings
Probably by different
coefficients of expansion between ceramic(s) and radiator box fine tears
arise in the ceramic substrate, which are to be recognized with the eye only
laboriously.
Leads sometime then also to interruptions in the imprinted conductive strips,
with me equal in six different places.
The situation of the hair-cracks in my RF power module.
I made the repair
with threading wire, whereby soldering is quite difficult by the strong
heat dissipation of the radiator box.
Do not forget a thin layer thermal compound with the re-installation.
I do not feel responseble for errors, do not blame me if the module die (maybe it was dead before!).
Published with
permision (21-08-2003) from Rolf Bleher DK7IN
(many thanks!).
The orginal info came from: http://www.dk7in.de/
