The "receiver thing" is a logarithmic amplifier. The final signal is labeled "video" and the signal strenght (voltage) is proportional in decibel scale with dynamic range around 60-70 dB. Also, the high frequency diode inside the cavital four pole band pass filter is a mixer. A simple one but it does the mixing job.
The ML-7855 is a UHF planar triode with maximum power dissipation of 100w and frequency rating of up to 2.5GHz. It normally has a heatsink at one end for air cooling.
Tube looks to be in grounded grid configuration. Probably the input is the cathode and the output is capacitively coupled (or coupled to the surrounding cavity) and the HV bias is applied through the spring-loaded top piece and some combination of the spring and metal end pieces are acting as a choke so there is a high impedance for RF looking into the power supply and therefore the coax-connected antenna becomes the load on the plate (anode).
The supp in and out will likely be mutual suppression bus. In civil aircraft. All systems on the L band (DME , TCAS and Transponders are all on a "mutual suppression bus to lower sensitivity, and stop them all transmitting at once and causing interference issues)
The blue device with "1000" written on it is a precision ceramic capacitor. The only ones in that form factor I have encountered myself are white ones made by Vitramon.
22:00 this board is toast. engineer's fail (or more likely, a fail of the financial department) 25:45 I've never seen an RF connector like this. 30:38 a TNC connector, by the looks of it 33:22 aaaaawwwww, this is so beautiful. cavities. for tuning / filtering. 38:50 my guess is some sort of a diversity circuit for multiple frequencies 48:23 you can pull it out. planar tubes are sitting kinda strong in their contact rings. 51:20 output *excellent video btw, thank you!!!
The "receiver thing" is a logarithmic amplifier. The final signal is labeled "video" and the signal strenght (voltage) is proportional in decibel scale with dynamic range around 60-70 dB. Also, the high frequency diode inside the cavital four pole band pass filter is a mixer. A simple one but it does the mixing job.
The ML-7855 is a UHF planar triode with maximum power dissipation of 100w and frequency rating of up to 2.5GHz. It normally has a heatsink at one end for air cooling.
Tube looks to be in grounded grid configuration. Probably the input is the cathode and the output is capacitively coupled (or coupled to the surrounding cavity) and the HV bias is applied through the spring-loaded top piece and some combination of the spring and metal end pieces are acting as a choke so there is a high impedance for RF looking into the power supply and therefore the coax-connected antenna becomes the load on the plate (anode).
The common grid suggest a very high frequency amp. The receivers input filter looks like at least a couple GHz band.
It's very interesting sir. Thank you for showing.
YAY!!!! Awesome. You really saved my day! Will watch it right now.
Surely enough youtube has been pretty quiet so far today, almost nothing interesting and I have more than 400 subscriptions.
The supp in and out will likely be mutual suppression bus.
In civil aircraft. All systems on the L band (DME , TCAS and Transponders are all on a "mutual suppression bus to lower sensitivity, and stop them all transmitting at once and causing interference issues)
The blue device with "1000" written on it is a precision ceramic capacitor. The only ones in that form factor I have encountered myself are white ones made by Vitramon.
22:00 this board is toast. engineer's fail (or more likely, a fail of the financial department)
25:45 I've never seen an RF connector like this.
30:38 a TNC connector, by the looks of it
33:22 aaaaawwwww, this is so beautiful. cavities. for tuning / filtering.
38:50 my guess is some sort of a diversity circuit for multiple frequencies
48:23 you can pull it out. planar tubes are sitting kinda strong in their contact rings.
51:20 output
*excellent video btw, thank you!!!
According to the datasheet that tube can output 40W at 500 MHz when driven with 6W. frank.pocnet.net/sheets/026/7/7855K-AL.pdf
The transistor on the first card you removed - did you say 2N2004? It looks like it says 2N2904.
The "Code Of The Day" Crypto unit would be a real plus.
Surprised how similar it all is to US equipment.
This is a cool video. Difficult to understand you but that's okay. It's even more fun to watch on 2x speed!
33:43 you could have sold that on ebay for at least 200$
L'accent anglais le plus pourris