Hi Armin!
Because VCR's time is out, mayfound for free,no charge.I can fine one, try not spend the time, but it's worth checking out.
73
4Z4LS
Posts by 4Z4LS
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Great work in both versions! SAW make his job everytime.
By the way, did you try to test stability of oscillator from TV MODULATOR. It's can be stable, in spite of variable capacitor. Really is simple, but i don't remember for change or adjust of frequency, because VCR working very stable. This one on the picture. UHF version cover frequencies from 517 to 635 MHZ.
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Test results of 3 LNB with replaced XTAL with TCXO. 2 types given good results - clear and stable signal.
OCTAGON 1609 with 7P-25.000MBP-T
STRONG SRT-739 with D75F-025.0M
VisionNET 300124 with D75F-025.0M
Can say only one - clear and perfect signal. In OCTAGON 1609 very important to inject TCXO to pin 7 (OSC2 or OSC Out) of RDA3566xx. Other LNB's not important. Coupling capacitor 4,7nF. Each TCXO have supply 3,3v from LDO. Capacitor across LDO 1uF ceramic 0805.
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More pictures from construction and measurments.
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Ok gentelmans, we forgott old devices, it's was working many year. Perfect quality of products, with only low stability of DRO oscillator for narrow BW. 1 year ago i build dual synthesizer module for some RX/TX path.
MAIN SYNTHESIZER, based on PLL of QUALCOMM Q3216i. This device not so simple for home builder, but the reason of use is because chip have 3 programming modes - direct parallel, 8-bit bus mode and series interface. Each mode have some set of options to control PLL chip. Datashet of device will attached to tread with many photos of device.Also i'll attache idea release of RX/TX path for single transiever with 144 MHZ band.
RFeference oscillator choosed 20MHZ TCXO, is on board. VCO - my choise is HV93T , cover 4,6~6,0 GHZ. PCB of main synthesizer is routed for one of Q3500 (VCO series) devices from QUALCOMM. I have almost of them, but i walk in other way. Because PLL's maximum frequency in for VCO is 2GHZ input, i build extended PCB in size of Q3500 VCO and set on some schematics with HMC434 (by 8 divider) and some components arownd. In that case PLL see 4700MHZ : 8=587,5MHZ, lock VCO and i can send out 2 carriers at the time - 4700 MHZ & 587,5 MHZ. Some trick is in use who build synth in serios labs. Because i have not deal with phase inverting, coheret side of deal not so important here. All math calculation on schematics diagram. First diags was draw on paper, after test few parts was deleted and changed. Theoretical calculation of LOOP FILTER some time required other values on PCB.
SECOND SYNTHESIZER based LMX1511 old PLL from NS (!). PIC controller consist of little program for controll PLL in lock position. VCO type from mobile phone 967NA (should be some old models of NOKIA) with central frequency of 945 MHZ. 3rd order LOOP FILTER in use, i have not problems with fast sttling time, is single frequency only. Out of synth divided by 10 with MC12080. Good device w/o excitment.
TOTAL PATH. 4700 MHZ doubled to 9,4 GHZ. enen low power of harmonics is good for injection instead DRO. Of course DRO removed from him place on LNB. Now we have IF out on 1089,55 MHZ, This signal filtered by TA1090 SAW filter, fc=1090MHZ. Product on frequency 1089,55 MHZ. This freqeuency subtrac by 945 MHZ (second PLL) in MIXER to 144,55 MHZ. The last one is TRX antenna in. RX path is simple. Next step is TX path. Divided 945 MHZ by 10, result will 94,5 MHZ. Next mixer subtrac 94,5 MHZ from TRX 144,55 MHZ will 50,05 MHZ. Next step is one more conversion. 587,5 MHZ from first PLL multiplied by 4 to get 2350 MHZ. This one mixed with 50,05 MHZ to 2400,05 MHZ for TX OUT.
Many mixers, but simple comstruction, minor size and low power consumption.
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I'm receive in 28 MHZ. First way to prevent image in 683 MHZ (not total), is connect mixer as up converter, LO=711 MHZ, IF=739 MHZ. Second way HPF 730 MHZ in line of LNB. What's problem can up in 683 MHZ? Even i power up TX mode, 683 x 3 = 2049, 683 x 4 = 2732 MHZ
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Hello Armin! Device also can working on HF, LO freq=711,5MHz.
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Jan, in same case SAT TV RX can get high level ESD into tuner. Is not a problem in this issue. You can short F on second side of coax and sonnect to ground point to prevent ESD. Also, see F-connectors w/o cable, internal pin forever inside.
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hi. to set DX Patrol to downlink or RX mode, you need external module frequency conversion based PLL with constant frequency of VCO=1660,5 MHz.
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This device with little addition can give a simple way for full duplex and use of single TRX for any frequency HF,VHF or UHF.
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Someone made similar test?My frequency calculation:
RX (10489.55 28.55) / 390 = 26.8230xxxx
28.55 + 2371.5 = 2400.05
In your frequency calculation is BIG mistake, because you are take RX downlink frequency (10,489) as final. Division by 390 is opposite of multiplier clock XTAL of 25 MHz, to get LO=9750 MHz. Even you are use in HF radio as basic XTAL frequency, not clear what is RX channel frequency. Were is your downconverter in formula? LO freq is demissed. Take basicaly LO=9,75GHz (standard LNB value) to get IF=739,xx MHz. in that case you can convert your RX to any range UHF,VHF or HF.
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It's possible, but required one more convertion for RX. if standard LNB run sat at 739,xx MHz, Si590 burned for 711,5 MHz can reduce IF frequency to HF range of 28 MHz. Sample of PCB from G0MRF.
Also, see picture. Not finished device, need only filter and attenuator. Si590 burned for HF out (f LO= 711,5MHz.)
One more device like this from DF1QE.
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If it's necessary, i can routing those boards to get GERBER format files for SMD & T.H. versions PCB.
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In continue of testing, few pictures of COMB generator from external source. Last one is little noisly, because PHASE NOISE of source at 10kHz offset ~90 dBc/Hz. Injected power to the COMB was in 2 levels: +17dBm & +25dBm. Internal lose in source frequency about 12 dB.
+17dBm is start working level wich wake up COMB gen. All pictures with span 1~5kHz seems 50Hz spurs. Testing in frequency 10 GHz.
In any case multiplied by 20 source signal have clear result.
to be continued.
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Last time was tested 3 different LNB's with TCXO 25 MHz from VANGUARD. Not so good and not reccomend. Carrier not clear. TCXO mounted on PCB & filtered in DC very well . Tight coax inject 25 MHz. One interest point - not important selected port X1 or X2 on PLL, LNB will wake up. I'm testing with load capacitor or w/o - working in any case.
LNB model SR-320 consist of PLL RDA3568 (?) ,other models RDA3566xx
OCTAGON OSLO 1609 http://www.pabr.org/radio/lnblineup/pcb_oslo1609.jpg working even coax connected (include GND!) direct to PLL w/o load capacitors.
Attachet picture of transmitter with WG 10,489 MHz.
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Nice to know that that those filters work as advertised I was thinking of getting one but then I found a PCB in the OSH Park shared area that the SF2124E fits on... Link
As you can see it was originally intended for the UHF filter but the SF2124E has the same footprint. A word of caution... it really needs hot air or an
73 Clive
BIG ATTENSION with prices of and lesd time in OSH Park. Download GERBER, chech in JLCPCB, and make order 5 PCB fot 2 USD. Shipping is same price,but lead time 24 hours only. 2-3 days you hsve your order.
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Hi!
How do you measure the effective power output of a PA rated 20 Watts nominal output with an rf power meter able to measure between -55 and -5 dBm.
please see here VERY SIMPLE POWER METER UP TO 2,5 GHz.
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Sometimes builders have not required underhand equipment . This issue every time care of self-builders. Analog Devices manufacturing a lot of IC’s for some homebrew applications. There is example to get some pleasant device with minor budget and not spend a lot of money.
Represented simple power meter, based AD8362 device; in my case from 500 MHz to 2,5 GHz because directional coupler cut some low frequencies range. Also, in use device from first lot, recover up to 2,7 GHz. Today’s TruPwr™ Detector (same device) recover up to 3,8 GHz.
Advantages - data sheets of AD8362 (Analog Devices) is exactly, what declare is what we get. Today with others it is much less.
No LCD and program needed. A small footnote on the scale of output voltages relative to the input power, also does not affect. The level of accuracy (+/-5%) is not in our case, everything is so precise and linear. The maximum input power of +8 dBm is not levels below zero. You can apply a few watts by connecting attenuators to the input (up to 5 watts).
Since the RF-cable from SG to DUT has a loss of 1 dB at a given frequency 2440 MHz, the input signal differs by 1 dBm from the name in the photo.
True schematics and app note part attached. Coupling transformer “RED TC1,6-4-2-3” was in use in 1st mixer of NOKIA 2120 mobile at late 90’s. To expand measurement range may reduce value of 10K resistor. This value adapted to voltage of micro analog port in VNA.
This device AD8362 and PCB have been “waiting” for their moment since 2002, when I built the NWT-7ex VNA (http://www.asobol.ru/moi-konstrukcii/nwt-7-ex UB3TAF). External detector of this equipment’s, PCB makes with Paint Brush and reproduced by thermal method.
See attached pictures of measurements in different levels, diagrams and PCB.
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Thank you!
