F5DQK July 2007 1

Ericsson Compact 9000UHF amplifier

F5DQK July 2007 2

28V power supply UHF class C amp

RF out N RF in NRF sensing connector

Ericsson Compact 9000 UHF amp: inside initial aspect

F5DQK July 2007 3

Ericsson Compact 9000 UHF amp: initial power supply

Filtering solenoid on +25V

F5DQK July 2007 4

Ericsson Compact 9000: UHF amp part

UHF circulator

Output bandpass filter

Amp inputAmp output

RF output

PTT RCA connector for DC biasing

Fan output while Txing

F5DQK July 2007 5

Ericsson Compact 9000 UHF amp: 2 parallel stages

Stage input

Stage output

F5DQK July 2007 6

Ericsson Compact 9000 UHF amp: one transistor surrounding

PTB20062

F5DQK July 2007 7

Ericsson Compact 9000 UHF amp: output lowpass filter

Amp output

Filter input

F5DQK July 2007 8

Ericsson Compact 9000 UHF amp: PTT wiring for DC bias

F5DQK July 2007 9

F5DQK July 2007 10

Ericsson Compact 9000 UHF amp:

F5DQK July 2007 11

Substitution of original 2 x PTB20062 with 2 x TP3069 (or

SD4590)

F5DQK July 2007 12

Ericsson Compact 9000 UHF amp : original PTB 20062

F5DQK July 2007 13

Ericsson Compact 9000 UHF amp : TP3069 or SC4590

F5DQK July 2007 14

PTB 20062 TP3069

Both collectors DC coupled !!

(or SD4590 equivalent)

Ericsson Compact 9000 UHF amp now with 2 x TP3069

F5DQK July 2007 15

Ericsson Compact 9000 UHF amp now with 2 x TP3069

Φ 1.2 mm wire hammered to H=0.75, then cut in adequate peaces

Step 1 : wire preparing

F5DQK July 2007 16

Ericsson Compact 9000 UHF amp now with 2 x TP3069Collector side

Base side

Soldering on printboard

Step 2 : wire soldering

F5DQK July 2007 17

Ericsson Compact 9000 UHF amp now with 2 x TP3069

original variable 0.8-8 pF trimcap above 27 pF cap between both bases

Step 3 : transistor fixing + soldering

F5DQK July 2007 18

Ericsson Compact 9000 UHF amp now with 2 x TP3069

Blue 1.6-15 pF trimcap

RF input side

Step 4 : LC inputs & outputs to lower from 440.5 to 432 MHz with add of 4 parallel trimcaps

F5DQK July 2007 19

Important equalizing

RF inputRF output

Drastic effect !Practically totally open

No influence, better totally open

Ericsson Compact 9000 UHF amp now with 2 x TP3069

Step 5 : convergent trimcaps adjusting at successively low, medium then high power

F5DQK July 2007 20

Miscellaneous

F5DQK July 2007 21

Ericsson Compact 9000 UHF amp : on/off switch addition on the rear side

Never used

Step 1 Step 2 : panel drilling

Step 3 : switch fixing Step 4 : mains wire access

F5DQK July 2007 22

Ericsson Compact 9000 UHF : solenoid take-off

Step 1Step 2 : strap (avoids problems in SSB that could also destroy the powertransistors)

F5DQK July 2007 23

Ericsson Compact 9000 UHF : linearisation

Adjust roughly to Vbase à 700 +- 10 mV

Ic sleep = 150 to 200 mA both collectors

F5DQK July 2007 24

SMA transfer relay adding fitted with RG402 semi rigid hardline

F5DQK July 2007 25

Câbles coaxiaux souples

F5DQK July 2007 26

Câbles coaxiaux souples

F5DQK July 2007 27

Ericsson Compact 9000 UHF : max power of semi-rigid cables à 450 MHz

Forbidden power zone

450

Diam 3.58 et

2.18

F5DQK July 2007 28

Ericsson Compact 9000 UHF : max power of semi-rigid cables à 432 MHz

F5DQK July 2007 29

Ericsson Compact 9000 UHF : max power of RG402 & 405 hardlines à 450 MHz

RG405 Φ2.18 ou 0.085"

RG402 Φ3.59 ou 0.141"

F5DQK July 2007 30

Ericsson Compact 9000 UHF : semi-rigid hardline dims

F5DQK July 2007 31

Output power measures

F5DQK July 2007 32

Ericsson Compact 9000 UHF : meas setup

Racal-Dana

Wattmeter

Bird 8135

dummy load

FT-847

Radial SMA

transfer relay

RFin

RFout

DC output for both Tx fans

PTT cinch

F5DQK July 2007 33

Ericsson Compact 9000 UHF : 28 Volt SMA transfer relay

F5DQK July 2007 34

Ericsson Compact 9000 UHF : Pout / Pin à 432 MHz

0

50

100

150

200

250

300

0 5 10 15 20 25 30

C9000

class

C

C9000

linea

r

TE Systems 4452g

Pin (W)

Pou

t (W

)

with 2 transistors TP3069

Both Pin & Pout measured at the output of a RADIALL R 556 431 transfer relay

Attention : C9000very critical zone!Safe Pout<250W

F5DQK July 2007 35

Ericsson C9000 à 432 MHz: Pout versus Pin

40

42

44

46

48

50

52

54

56

30 32 34 36 38 40 42 44 46Pin (dBm)

Pou

t (dB

m)

with 2 transistors TP3069

C9000 class C, Glin

=11 dB

C9000 linear, Glin=14 dB

TE Systems 4452g Glin=10 dB

52.6

54.3

53.8

P1dBc (dBm)

18210TE-4452G

26911.5C9000 class C

24014C9000 linearised

P1dBc (W)

Glin (dB)