d21. Magnetic (Sonab)
2m 120-150W PEP transistor forsterker*
70cm 80W lineær forsterker*
150W
PEP Lineær forsterker ombygging til 144MHz
Magnetic TU8131 Solidstate 144-174MHz 100W
FM amplifier (2x CTC BM70-12).
The unmodified with all the social democracy, and a unit prepared
for conversion with the rubbish removed.
It is a 30W PIN-powerdiode attenuator, so it is well worth
keeping the board to be removed.
In the original application power output is varied with varying
supply voltage between 12...14.5V.
Such is not a good idea, and the potmeter on chassis could just
be removed as stage one of the modification.
Since over 15V supply is
used with the same amplifier in TU8171 it should be no reason not
to do the same for
this unit.
See somewhat more modern version of the
same Magnetic amplifier on page d25
De viktigste delene i TU8131 2m forsterker
Magnetic combiner TU8131 is a complex equipment consisting of
55-75W amplifiers. It is a lot of Swedish social democracy
on the input side, and directional couplers on the output for
measurements. One amplifier has 55W output for 10W drive,
it consists of 2 similar amplifiers (2x CTC
BM70-12), where one is used as driver and the two other
are driven in parallel.
The most common problem is that
somebody tried to use solder without silver and connections in
the collector
circuit were bad after some time with substantial lack of gain.
Supply line testpoint: 0.25V drop for 10A current
PC204a 3dB kopler (hybrid) for 2m. Hybrid
for 70cm (450MHz) er PC204, om disse er forskjellige aner jeg
ikke.
For begge er det oppgitt max 200W input. Det er også oppgitt at
PC204 og PC204a består av
Ytterlaminat = 1st PC204
.................. = 1st PC206
Innerlaminat = 1st PC205
PC218 regulatorkort har ikke så mye hensikt til en
linearforsterker, men her er noen fine effekt-PIN-dioder! (kun
HF-delen av skjemaet er vist)
Retningskopler og lavpassfilter. PC214 og PC203
4-way Wilkinson combiner for 4x 100W 2m FM forsterkere
Magnetic PC203/PC214 2m- and PC202/PC203 70cm
filterkopplare, se koplingsskjema nedenfor
Kontrollkrets for Jotron 250W VHF power
amplifier,
Noen små endringer trengs for TU8131 og lignende forsterker som
drives fra 12-14VDC
BIAS regulators:
Enkel BDV65A monteringsdetaljer og forslag til PCB utlegg
Dobbel bias regulator (BDV65A) for Magnetic
TU8131 2m 150W PEP lineær forsterker
The same info is
mentioned at C.12
80W PEP Linear amplifier for 432MHz TU8062.
A very similar unit was made for UHF mobile telephone system
(covering a part of the NMT band 461-464MHz base stn transmitter)
and it is easily converted to 70cm ssb. It is very much RF fields
in the box,
I once tried to use it as a beacon (LA9UHF), but the logic
wouldn't operate because of extensive RF in the box
De viktigste delene i Magnetic TU8062 som 70cm 80W
Lineær forsterker
TU8062. En av 3 like
(70cm) forsterkere (9W drive for 30W RF). VHF Power transistor:
CTC CM40-12 (CM45-12A)
se også side D24 for 2m NEC and
Magnetic personsøkersendere
Magnetic PC202/PC203 70cm Filterkopplare (TU8062)
SSB Electronics PA144-200 er faktisk ganske nær
det samme trinnet som ovennevnte og det tilsvarende som ble
brukt i Magnetic personsøkere for tekst.
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Omtale i SSB Electronics katalog 1990
Koplingsskjema for dette PA-trinnet. Det er brukt en enkel
forspenningsregulator med 2 transistorer og en sekshullskjerne
(som bredbåndsdrossel, Valvo VK200), den siste og bruk av
elektrolytkondensatorer er viktig for å unngå spuriøse.
sist oppdatert 2004.09.12