sorry I used what I had at home for pc fr4 with a thickness of 0.8 mm
Posts by iw5bsf
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Hi to test I am using a maximum external power supply at 22 V, does not seem to go into the example of self-oscillation below 2.4 ghz tends to increase the output copper under both the connection board ok
Roberto
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Hi I built the cun mhl21336 amplifier but depending on the length of the output cable the resonance changes, it doesn't give me power because it should be along the ut141 cable
Hi I built the cun mhl21336 amplifier but depending on the length of the output cable the resonance changes, it doesn't give me power because it should be along the ut141 cable
Display MoreA pity to read your experience. Normally this module does not give any problems. Essential however is a good grounding,
I used thin copper foil under module as well as the board. see my earlier photo.
My module easily outputs 2.5 Watts without overdriving the input.
I experimented with a trimmer at output, but that is really not necessary.
73 de Cor
thanks, the 5000 pf capacitors I used 4700 and two vk200 inductors for power supply should not be critical
Roberto
RBRluccalLO
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Hi I built the cun mhl21336 amplifier but depending on the length of the output cable the resonance changes, it doesn't give me power because it should be along the ut141 cable
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this detector is also interesting
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Hi,
PA0P what exactly are these two components? I have found some of these at power lines and I do not know what they are.
Sorry thank info
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Hi Roberto,
Schematic is very simple. As per datasheet do not drive more than 5 mW at the input (50 ohm), put 12 to 28 Volts on pins 2 and 3 depending on the output you want and output is at pin 4 (50 Ohm).
See the photograph for the decoupling of the powerlines. Take several values of capacitors, I did 22pf, 5000pf and 100nf. Any series inductor from the junkbox will do.
Take attention to get a good ground connection, remember it is 2.4GHz...
Hi I received the mhl21336 from ebay sorry, am I going to know the two large capacitors you see in the value of the photo? and the small ones I think are 22 pf, and the two value inductor?
tnx Roberto
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hello all my reference used with success an oscillator with crystal 27 MHz of the phillps ex tele text tv
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Thanks and a cable that I had at the station yes, I do not like the optimal bnc are definitely N the size I made with a directional coupler and an hp436a bolometer and a hp8673d signal generator these are my means of availability
thanks again for the advice
for amp I am experimenting with rf126 1 watts followed by draiver vna25 with input +10 dbm I have to print the pcb
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With all due respect, I doubt this value as no datasheet of the various H155 variants suggests an attenuation of <0.1dB/m @2400 MHz. BNC is not optimal as well on 13cm, but this is another issue. My point is that the H155 cable is a 5-6mm OD cable and even a 1/2 inch cellflex coaxial cable (LCF12-50) only reaches 0.11dB/m.
That said, 1dB difference is barely noticable in daily life unless you have QRO amplifiers or cable in front of the LNA
Thanks and a cable that I had at the station yes, I do not like the optimal bnc are definitely N the size I made with a directional coupler and an hp436a bolometer and a hp8673d signal generator these are my means of availability
thanks again for the advice
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also as "RYRYRY DE QO4FUN" with 50 baudot on 620,
uplink QRG not stable, is constantly corrected irregularly ...
Display MoreIt is probably a phenomenon of our time that even intelligent people today pull themselves up on such things and deceive themselves and others.
Is it our "gravestone" that urgently needs psychological help, or is it the RTTY station that dilettantely pretends to be a military signal to itself and others? Yes yes-- "target" found... Unfortunately, he probably revealed himself by his sidebands of the mixer and CW identifier.
Sometimes I wonder what "goes on" in such heads when they look at their own nonsensical signal for hours...
But in the end amateur radio is only a mirror image of a society that possesses better and faster means of communication, but loses the "communication" capability between people more and more.
Since the advent of FT8, SSB activity on the short wave has declined noticeably, I have been told. Only the machines are talking between them..
When you walk through the city, all people have a smartphone in front of their nose, in the metro, even in the restaurant and at the bar, these people no longer talk to each other.
On QO-100 you sometimes see more SSTV/Fax/Packet and other "low communication" signals than SSB... I hope QO-100 is not 10 years too late in this respect!
Reach-out more for the microphone!
hello Peter, I'm preparing the station, in fact I had noticed these phenonemes in the past while I was listening I agree with what you say
Roberto
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hello everybody I tried 3.5 m of h155 cable with two bnc that I loss 0.37 @2400
I use Airborne-10, it has 0,19dB/m loss on 2G4
https://messi.it/dati/immagini/AIRBORNE10-All2_EN.pdf
73
Roberto
I just got delivered today 1.5m of Ultraflex 7 from http://www.kabel-kusch.de made to order including 2x N. measured loss 0.55 dB @2405 MHz, including connectors.
hello test 3.5 m of h155 cable with two bnc that I loss 0.37 @2400
Roberto
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web site link
h-155 0,49 db/m @ 2400 MHz
rf-240 0.42 super low loss
I use Airborne-10, it has 0,19dB/m loss on 2G4
https://messi.it/dati/immagini/AIRBORNE10-All2_EN.pdf
73
thank
Roberto
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thank
yes interesting thanks I take note of it
Roberto
iw5bsf look at this..may be this will fit for you as well..
https://www.wlan-shop24.de/Koa…Loss-Wetterfest-Meterware
Good morning to all the cables 2.4 ghz that I can use at low loss, I looked lmr600 but it seems to me a very high price and in Europe it seems to me that maybe you don't find an alternative?
Roberto
web site link
h-155 0,49 db/m @ 2400 MHz
rf-240 0.42 super low loss
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thank
iw5bsf look at this..may be this will fit for you as well..
https://www.wlan-shop24.de/Koaxial-Antennenkabel-H-155-Low-Loss-Wetterfest-Meterwa
yes interesting thanks I take note of it
Roberto
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Good morning to all the cables 2.4 ghz that I can use at low loss, I looked lmr600 but it seems to me a very high price and in Europe it seems to me that maybe you don't find an alternative?
Roberto
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thank you when I modified LNB OCTAGON with external reference. I use a 27 mhz crystal oscillator ex PH with a very stable low noise -149dbc made at home, now I have to start thinking about the transmission
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Hi Roberto,
Schematic is very simple. As per datasheet do not drive more than 5 mW at the input (50 ohm), put 12 to 28 Volts on pins 2 and 3 depending on the output you want and output is at pin 4 (50 Ohm).
See the photograph for the decoupling of the powerlines. Take several values of capacitors, I did 22pf, 5000pf and 100nf. Any series inductor from the junkbox will do.
Take attention to get a good ground connection, remember it is 2.4GHz...
ok have you tried in ssb how it works?
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Hi Roberto,
Schematic is very simple. As per datasheet do not drive more than 5 mW at the input (50 ohm), put 12 to 28 Volts on pins 2 and 3 depending on the output you want and output is at pin 4 (50 Ohm).
See the photograph for the decoupling of the powerlines. Take several values of capacitors, I did 22pf, 5000pf and 100nf. Any series inductor from the junkbox will do.
Take attention to get a good ground connection, remember it is 2.4GHz...
thank
Roberto
