LDM

[@glmm2001]

APR-9 was a Radar Warning Receiver used aboard B-47 and other strategic bombers. It has several components including: Tuner Unit Type TN-128/APR-9, Tuner Unit Type AT-129B/APR-9, Radar Tuner Type TN-131/APR-9, Power Supply Unit Type PP-337C/APR-9, Power Supply Unit Type PP-336A/APR-9, Amplifier Type CV-43A/APR-9, Indicator Type ID-226A/APR-9, Control Unit Type C654/APR-9B, Tuner Unit Type TN-131/APR-9 and Aerial Type AT-219/APR-9

[@Bordberti]

Das waren simple Detektor Empfänger und danach wurden die Signale über eine Schwelle(Rauschsperre gegeben) und auf einen Zähler gesendet, der hat die PRF des Radars bestimmt. Dann gab es sowas wie eine Datenbank, in der die unterschiedlichen PRFs gespeichert waren und unterschiedlich Warnungen ausgegeben haben(zB. Feuerleitradar on Air ) Ich bin Eloka gewesen bis 2000 und Funkamateur. Wir haben im Stab die nötigen Datenbanken erstellt auf Daten einem Aufklärer gesammelt. Ich habe zusätzlich eine Ausbildung an der Octopus Anlage und FL1800 erhalten. LG Maik 73 DG5YHS

[@jagaszepielak2601]

@@Bordbertiwaooo wriillyyy😂😂😂😂😂😂😂

[@-r-495]

a positive aspect of air and space equipment is the lack of potting. very nice layout, the electromechanical system is very intriguing. Merci!

[@hinz1]

Crazy how much machining went into each of these things.

[@satipsrl5207]

machining without cnc or punched tape programmed mills .... More work , workers , crafters ....was a beautiful world .

[@davidparrot4669]

Merci Michel, encore une merveille, un grand merci pour le partage c'est toujours un vrai plaisir.

[@gabrielepasqualoni7362]

Affascinante! E amcora funziona dopo 70 anni ! Complimenti per le tue conoacenze dettagliate ,le schede dei componenti (penso introvabili ) e per la disponibilità di certi apparati. !

[@Cyrob-org]

Hello, impressive !

[@CuriousMarc]

Talk about RF goodness! You have expect to need steam to make it work!

[@pushkarnarayan5193]

Osm brother, keep it up. Love from India 🇮🇳🇮🇳🇮🇳🇮🇳🇮🇳

[@uploadJ]

5654, also known as 6AK5, is a very good VHF amplifier tube ... they used to use these in set-top/outboard VHF preamplifiers for TVs in the 60s into the 70s is where I saw them.

[@leitopeugeot]

Gracias !!!

[@wolpumba4099]

*Inside a Vintage Radar Tuner TN-131/APR-9: Teardown and Analysis* * *0:14** Radar Tuner Background:* The video explores a TN-131/APR-9 radar tuner, a component of the APR-9 radar warning system used in aircraft like the B-47 bomber. [From Comments] The APR-9 is more specifically identified as a Radar Warning Receiver. * *1:28** Klystron Local Oscillator:* The tuner utilizes a 2K48 reflex klystron as its local oscillator, with frequency adjusted via a plunger mechanism. * *1:53** Dual Cam System:* Two cams are employed: a fixed cam for setting the klystron frequency and an adjustable cam for modifying the central frequency of the input filter. * *2:09** Bandpass Filter:* A waveguide bandpass filter, adjustable via screws, ensures a constant frequency difference between the local oscillator and the central frequency. * *3:20** Servo Control:* A geared DC motor and a likely synchro transmitter are used for servo control of the frequency setting. [From Comments] The synchro transmitter likely connects to a remote indicator to display the tuner's frequency. * *6:10** IF Preamplifier:* A separate module houses a four-tube IF preamplifier using 5654 (6AK5) tubes, powered externally. [From Comments] The 5654/6AK5 is known for its use in VHF TV preamplifiers. * *8:02** Mixer Diode:* A 1N26 diode serves as the mixer, combining the input signal with the local oscillator frequency to produce the IF signal. * *10:48** Potentiometers and Voltage Regulation:* Two large wirewound potentiometers are present, likely for controlling reflector voltage and providing feedback for servo control. OB2 voltage regulator tubes are also identified. * *13:52** DC Motor:* A 28V, 0.7A General Electric DC motor with a built-in brake drives the mechanical tuning system. * *15:38** Limited Testing:* Due to the lack of a suitable power supply, full functionality testing was not performed. I used gemini-1.5-pro-exp-0801 to summarize the transcript. Cost (if I didn't use the free tier): $0.06 Input tokens: 15555 Output tokens: 526

[@5Perf65mm]

It isn’t a radar unit that is I believe from an ELINT system. It is from an ESM/ECM receiver that with different tuner units could cover 1GHz-10GHz.

[@satipsrl5207]

merci michel...si j'ai bien compris c'est le front end d'un recepteur pour radar ...un pll mecanique avec un klystron reflex au lieu d'un varacteur en cavitee comme oscillateur local ...enfin je crois que ma definition pll est faux pcq il n'ya pas de detecteur de phase et le standard de reference . nexiste pas .la calibration se fait en fabrique sur la camme . le servo synchro sert a cherher le signal if maximum un peu comme notre afc des annees passees. Je commence a oublier mon farnçais de belgique apres 43 ans en italie ...merci beaucoup ancore

[@turkalpkucur]

perfect

[@norway4423]

Очень интересно.

[@haferraresi]

👏👏👏👏👏👏👏👏👏

[@Kretion666]

nice vids :D

[@alainmichaud8992]

This looks like the first mixer and the VCO of an SHF receiver

[@paulkocyla1343]

Great stuff, thanx for showing us this beautiful tech. No need to be sorry for the pronounciation: French accent sounds so good, you could call us all "d4mn m0therfuckers", and we would still be flattered 😀

[@GernotBoye]

dieser Tuner war Bestantsteil des Radarpeilempfaenger MLQ-24