Posts by SP3OSJ
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Hi
Thanks for your comments.
I used 2.1MHz capacitors (Note transistor PDF).
Then I changed them and swapped 0p5F and 2p2F and forgot to draw it. If you remove the soldermaske capacitors 1p8 and 1p2 from the bottom, these must be selected individually.
I changed the 110R resistor to 75R to get the bias of the transistor 400mA at 28V.
1) My circuit is for PTT on antenna cable 50R + 5V cable (low current efficiency). Picture: 1a.jpg / PA_a.jpg
2) For VOX. I haven't checked this layout but it should be OK. Diode 2x BAT62. Picture: 1b.jpg / PA_b.jpg
3) External PTT + 12V TX. Picture: 1c.jpg / PA_c.jpg73
Artur
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Hi
BOM (pdf) my TRV2
73
Artur
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Hi
A few photographs of TRV2
The VCOCXO generator has its own additional housing
50R (6x300R) 6x2W resistors do not touch the PCB.73
Artur
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Hi
50MHz firmware added for ATtiny13
TRV2_6_10 for out 50.5-51MHz and 29-29.5MHz
For people who have problems with ATtiny programming, I can suggest ATTiy already programmed for this TRV.
73
Artur
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Hi
Yes it's true.
For 29MHz it is capacitor the value 6.2pF.
For 144MHz it is 2.7pF value.For 439 is 1.2pF value.
The fewer the better.
VOX operate on an operational amplifier.73
Artur
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cześć
Diagramy TRV
Tłumienie LO i drugi sygnał miksujący dla 29MHz
LO: -15dB (jeden filtr SF2124E) + -15dB (dwa filtry SF2124E) + -30dB (podwójnie zbalansowany mikser ADE-25MH) = -60dB
Mieszanie różnicowe: -43dB (jeden filtr SF2124E) + -43dB (dwa filtry SF2124E) + -7dB (podwójnie zrównoważony mikser ADE-25MH) = -93dB
Sumowanie miksowania: (sygnał 2,4 GHz): -2 dB (jeden filtr SF2124E) + -2 dB (dwa filtry SF2124E) + -7 dB (podwójnie zbalansowany mikser ADE-25 MH) = -11 dB
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The video is still being recorded on the YouTube platform.
Time to finish is 30 minutes.
Please wait -
Only simplex, just like communication on 80m, 40m .....
If you want duplex you need to help yourself with the Internet:
https://eshail.batc.org.uk/nb/I recorded a movie how my TRV works !!!!
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Hi
1) Yes, the frequency ~ 740MHz is converted to: 10/2/0.7m. I'm using a one mixer ADE-25MH (5-2500MHz)
2) I use two solutions:
- Well-designed PCB (look screen)), polystyrene, and PCB cutting around the generator, 50R artificial load.
You can use VCTCXO with 0.1ppm but they cost a lot.
- VCOCXO can be used: I bought a small OCXO (25MHz/5V) on http://www.ebay.com for $ 9.90 and rebuilt it to VCOCXO (add one resistor).73
Artur
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Hi all.
I want to show the new TRV project for frequencies
1) 29-29.5MHz
2) 144-144.5Mz
3) 439.5-440MHzTRV in one box has a receiving part (740MHz) and a transmitting part PA 2W out (2.4GH). It injects a stable 25Mz signal into the LNB and is powered by 12V.
2W is enough to have a strong signal on the Oscar-100TRV has low prices of items:
Ready generator module 11.5 $:https://aliexpress.com/item/4000068359970.html
Aluminium case 2.50 $:
https://aliexpress.com/item/4000067969131.htmlVCTCXO generator 0.5ppm 1.00 $:
https://aliexpress.com/item/33013343039.html
PA transsistor (10psc-30$) 1psc 3.00 $:
https://aliexpress.com/item/32973216655.html
Power 12V (DC 2.5-0.7MM + 1A + EU + 12V) 2.50 $:
https://aliexpress.com/item/32857105606.html
PCB 11.5 $
Filter SF2126E (700-750MHz) and filter SF2124E (2.4GHz) look for:
73
Artur
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Hi
I discovered the relationship between the probe and the lens.
Foto:
73
Artur
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Hi people
I made 20W amplifiers in enclosures from WiFi amplifiers.
PTT is controlled by means of a 50R cable which as it transmits attaches the stabilizer to the BIAS transistor.Power input max: 0,9W,
BIAS BLP9G0722-20G: 460mA for 28V.
Imax: 1.5A
Supply voltage - power out:
28V - 20W
24V - 16W
20V - 11W
13.8V - 5W
PCB: FR-4 (no: PCB ROGERS), thick: 0.5mm.
Foto:
73
Artur
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This is ceramic generator DRO, no quartz.
For use in my constructions there is only a teflon lens.
DRO vs PLL:
http://lnbreviews.blogspot.com…-lnb-which-is-better.html
73
Artur
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Hi
Is this fair?
Can anyone explain it?
What does it mean: "Quartz Cristal Control" in this LNB?
73
Artur
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Hi
LNB modification for TRV OSCAR-100:
http://www.kooikerhondje.com.pl/movie/TRV_LNB.pdf
and signal road TRV (RX and TX):
http://www.kooikerhondje.com.pl/movie/Signal_road.pdf
73
Artur