SSPA Construction Techniques
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- Daniella Martin
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1 SSPA Construction Techniques 6m, 2m, 222MHz, 70cm 23cm and above MHz digressed a bit at mentioning , didn t I? September 2016 Austin BBQ,
2 But Wait Let s examine how to build that SSPA And operate our radio and SSPA in a manner that complements our esteemed position in the food chain And then maybe we should look at modern SDR radios/amplifiers/accessories that will expand our enjoyment of the hobby September 2016 Austin BBQ,
3 Retired from HP/Agilent mid-2006 Web site started as a technical sharing site Most projects initially were for my own use Snowball effect to were it is now Primary target audience is DIY amateur September 2016 Austin BBQ,
4 Some Examples of Color Schemes and Options September 2016 Austin BBQ,
5 Rack Mount Option September 2016 Austin BBQ,
6 Desktop Amp for 1296 September 2016 Austin BBQ,
7 150w version for 1296 with internal power supply September 2016 Austin BBQ,
8 BIG LDMOS devices are available At reasonable cost Freescale and NXP (Phillips) MRFE6VP1K25H kw (Freescale) HF to ~300MHz MRFE6VP5600H 600w (Freescale) HF to 450 MHz MRF1K50 1.5KW BLF188XR -1.4KW (NXP) HF to ~300MHz BLF184XR 600w (NXP) HF to 450MHz September 2016 Austin BBQ,
9 VHF RF Decks September 2016 Austin BBQ,
10 We must kill all of that extra low frequency gain. This design used for 2m and 222 has an ally in that battle, the input transformer. It s nature at lower frequencies is to short the gates together September 2016 Austin BBQ,
11 70 CM is a different animal 70cm 1.25kw part produces ~350w with low efficiency 600w part produces 500w at P1db with 53% efficiency Two of the 600w parts produce 1kw at P1db with 53% efficiency September 2016 Austin BBQ,
12 Design Cautions 1. All bands Use good quality PC board substrate Matching components (capacitors) Best capacitor for matching is coaxial Instability due to low frequency gain Gate components Degenertative feedback (res/cap in series drain to gate) 2. Bias stability (thermal drift) LDMOS IDQ thermal drift Use of thermistors for stabilization.047uf 450v 4t #22 3mm diameter.047uf 50v 440 3w metal film MRFE6VP61K25H Or BLF578XR Or BLF188XR 440 3w metal film September 2016 Austin BBQ,
13 Mounting of Degenerative Feedback Components on 70cm KW board September 2016 Austin BBQ,
14 Thermistor Location September 2016 Austin BBQ,
15 A Legal-Limit 6 Meter SSPA September 2016 Austin BBQ,
16 And on the inside September 2016 Austin BBQ,
17 Bills of Materials description p/n quantity supplier #10 THHN stranded wire, black 15ft Ace hardware #10 THHN stranded wire, red 15ft Ace hardware #14 THHN stranded wire, blue 5ft Ace hardware #14 THHN stranded wire, red 5ft Ace hardware #18 THHN stranded wire, red 5ft Ace hardware White rubber feet, 4 per pack 1 pack Ace hardware multi-conductor hook-up wire, 10ft 10cs22 10ft Allelectronics meter, panel, 100V DC PMD-100V 1 Allelectronics meter, panel, 50A DC PMD-50A 1 Allelectronics meter shunt, 50A snt-50 1 Allelectronics 5mm led, red LED-1 2 Allelectronics 5mm led, yellow LED-3 1 Allelectronics 5mm led, green LED-3 1 Allelectronics 60mm fan, 17cfm, 12v CF Allelectronics sma jack for rg174/rg316 Ebay 4 Ebay sma plug for rg174/rg316 Ebay 4 Ebay rg142 coax, 5ft Ebay 1 Ebay rg316 coax, 6ft Ebay 1 Ebay flat washer, # a505 box of 100 McMaster-Carr flat washer, # a509 box of 100 McMaster-Carr flat washer, # a512 box of 100 McMaster-Carr September 2016 Austin BBQ,
18 Block diagram For a complete Desktop amplifier September 2016 Austin BBQ,
19 Flange-Mount Attenuators Available in 3,6,10,20 and 30 db packages (availability varies) Made by ATC and Johanson 100 watt package Requires transistion boards September 2016 Austin BBQ,
20 A more flexible option September 2016 Austin BBQ,
21 Low Pass Filter September 2016 Austin BBQ,
22 Filter Passband 2m setup September 2016 Austin BBQ,
23 Low Pass Filter with dual directional detector September 2016 Austin BBQ,
24 Low Pass Filter with dual directional detector 1. Coupler will sample both forward and reflected power levels 2. Each band can be configured for correct signal levels On-board attenuators set the correct signal levels for the detector diodes September 2016 Austin BBQ,
25 Antenna Relays (output) Transfer switch Dow Key model 412 SPDT model 402 September 2016 Austin BBQ,
26 Antenna Relays (output) SPDT Tohtsu model CX600NL September 2016 Austin BBQ,
27 Relay Measurements (CX600NL) insertion loss September 2016 Austin BBQ,
28 Relay Measurements (CX600NL) return loss September 2016 Austin BBQ,
29 Relay Measurements (CX600NL) isolation September 2016 Austin BBQ,
30 Antenna Relays (input) September 2016 Austin BBQ,
31 Relay Specs (CX120A) insertion loss September 2016 Austin BBQ,
32 Relay Specs (CX120A) return loss September 2016 Austin BBQ,
33 Relay Specs (CX120A) isolation September 2016 Austin BBQ,
34 Relay Specs isolation (G2RL series) September 2016 Austin BBQ,
35 Control Board Functions Sequencer Prevents hot-switching the antenna output relay DC power gate VDD and bias (event 2) Fan control Reverse power lockout (high VSWR) Over-temp lockout Sequenced LNA power feed and drive power gating if required (event 3) September 2016 Austin BBQ,
36 HF Amplifiers which include 6M W6PQL 1kw on 160m thru 6m 1.5kw+ version w/1500w on 6m Broadband transformer design Other suppliers (many) Very complex switching and filtering, as you can imagine Harmonic content is as high as -11dbc on some bands Thus, a complex output filter is required LPF or Combination LPF and diplexer September 2016 Austin BBQ,
37 1KW MHz HF Amplifiers September 2016 Austin BBQ,
38 September 2016 Austin BBQ,
39 Legal-Limit (+) versions September 2016 Austin BBQ,
40 September 2016 Austin BBQ,
41 September 2016 Austin BBQ,
42 September 2016 Austin BBQ,
43 September 2016 Austin BBQ,
44 September 2016 Austin BBQ,
45 September 2016 Austin BBQ,
46 September 2016 Austin BBQ,
47 September 2016 Austin BBQ,
48 September 2016 Austin BBQ,
49 September 2016 Austin BBQ,
50 September 2016 Austin BBQ,
51 September 2016 Austin BBQ,
52 Barefoot Apache 100D -30 db imd3 September 2016 Austin BBQ,
53 Barefoot Apache 100d with Puresignal correction -63 db imd3 September 2016 Austin BBQ,
54 1KW SSPA -34 db imd3 September 2016 Austin BBQ,
55 1 KW SSPA with Puresignal correction -61 db imd3 September 2016 Austin BBQ,
56 1 KW SSPA, Puresignal on, speaking the word hello September 2016 Austin BBQ,
Low Pass Filter (rev 5) for single and 2-Pallet HF Amplifiers The filter sections on this board differ from the web article, and offer some
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