Ericsson Compact 9000 UHF amplifier

F5DQK July 2007

1

Ericsson Compact 9000 UHF amp: inside initial aspect 28V power supply

RF out N F5DQK July 2007

UHF class C amp

RF sensing connector

RF in N 2

Ericsson Compact 9000 UHF amp: initial power supply

Filtering solenoid on +25V

F5DQK July 2007

3

Ericsson Compact 9000: UHF amp part PTT RCA connector for DC biasing

UHF circulator

RF output

Output bandpass filter Fan output while Txing

F5DQK July 2007

Amp output

Amp input

4

Ericsson Compact 9000 UHF amp: 2 parallel stages Stage output

Stage input F5DQK July 2007

5

Ericsson Compact 9000 UHF amp: one transistor surrounding

PTB20062

F5DQK July 2007

6

Ericsson Compact 9000 UHF amp: output lowpass filter

Amp output

Filter input

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7

Ericsson Compact 9000 UHF amp: PTT wiring for DC bias

F5DQK July 2007

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9

Ericsson Compact 9000 UHF amp:

F5DQK July 2007

10

Substitution of original 2 x PTB20062 with 2 x TP3069 (or SD4590)

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11

Ericsson Compact 9000 UHF amp : original PTB 20062

F5DQK July 2007

12

Ericsson Compact 9000 UHF amp : TP3069 or SC4590

F5DQK July 2007

13

Ericsson Compact 9000 UHF amp now with 2 x TP3069 PTB 20062

TP3069 (or SD4590 equivalent)

Both collectors DC coupled !!

F5DQK July 2007

14

Ericsson Compact 9000 UHF amp now with 2 x TP3069

Step 1 : wire preparing

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

F5DQK July 2007

15

Ericsson Compact 9000 UHF amp now with 2 x TP3069 Collector side

Step 2 : wire soldering

Soldering on printboard

Base side F5DQK July 2007

16

Ericsson Compact 9000 UHF amp now with 2 x TP3069 Step 3 : transistor fixing + soldering

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

F5DQK July 2007

17

Ericsson Compact 9000 UHF amp now with 2 x TP3069 Step 4 : LC inputs & outputs to lower from 440.5 to 432 MHz with add of 4 parallel trimcaps

Blue 1.6-15 pF trimcap

RF input side F5DQK July 2007

18

Ericsson Compact 9000 UHF amp now with 2 x TP3069 Step 5 : convergent trimcaps adjusting at successively low, medium then high power

Drastic effect !

RF input F5DQK July 2007

Important equalizing

No influence, better totally open

Practically totally open

RF output 19

Miscellaneous

F5DQK July 2007

20

Ericsson Compact 9000 UHF amp : on/off switch addition on the rear side Step 1

Step 2 : panel drilling

Never used

Step 3 : switch fixing

F5DQK July 2007

Step 4 : mains wire access

21

Ericsson Compact 9000 UHF : solenoid take-off Step 1

F5DQK July 2007

Step 2 : strap (avoids problems in SSB that could also destroy the power transistors)

22

Ericsson Compact 9000 UHF : linearisation

Adjust roughly to Vbase à 700 +- 10 mV

Ic sleep = 150 to 200 mA both collectors

F5DQK July 2007

23

SMA transfer relay adding fitted with RG402 semi rigid hardline

F5DQK July 2007

24

Câbles coaxiaux souples

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Câbles coaxiaux souples

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26

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

Diam 3.58 et 2.18

Forbidden power zone

450

F5DQK July 2007

27

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

F5DQK July 2007

28

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

RG402 Φ3.59 ou 0.141" RG405 Φ2.18 ou 0.085"

F5DQK July 2007

29

Ericsson Compact 9000 UHF : semi-rigid hardline dims

F5DQK July 2007

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Output power measures

F5DQK July 2007

31

Ericsson Compact 9000 UHF : meas setup FT-847 RFin PTT cinch

Radial SMA transfer relay RFout

Bird 8135 dummy load

DC output for both Tx fans

Racal-Dana Wattmeter

F5DQK July 2007

32

Ericsson Compact 9000 UHF : 28 Volt SMA transfer relay

F5DQK July 2007

33

Ericsson Compact 9000 UHF : Pout / Pin à 432 MHz with 2 transistors TP3069 300 250

Attention : C9000 very critical zone! Safe Pout