RF Porn, teardown of Apollo Comms, the S-Band Transponder and Amplifier. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: September 18, 2021, 03:57:26 am
content: Enjoy 1960's 2.1GHz RF technology:

author: eti
author_rank: Super Contributor
timestamp: September 18, 2021, 04:26:42 am
content: Yeah, could the internet DROP this tedious idiotic habit of appending <* porn> to the end of their favourite subject.Please, but I know you won’t. It’s IDIOTIC, and juvenile.

author: KaneTW
author_rank: Frequent Contributor
timestamp: September 18, 2021, 04:30:36 am
content: pornography (n)1: the depiction of erotic behavior (as in pictures or writing) intended to cause sexual excitement2: material (such as books or a photograph) that depicts erotic behavior and is intended to cause sexual excitement3: the depiction of acts in a sensational manner so as to arouse a quick intense emotional reactionseems like a dictionary-correct use of the word

author: eti
author_rank: Super Contributor
timestamp: September 18, 2021, 04:35:49 am
content: Have a look -https://1061evansville.com/can-we-please-stop-describing-everything-as-whatever-porn/It’s about not following along with internet ways and being a lemming, basically. Doing that demonstrates a clear deficit in discernment.

author: james_s
author_rank: Super Contributor
timestamp: September 18, 2021, 05:18:34 am
content: Reminds me a little of the inside of a HP spectrum analyzer.

author: BrianHG
author_rank: Super Contributor
timestamp: September 18, 2021, 05:35:24 am
content: @10:30, is that hot snot glue on those connectors? Did they have Bostick glue back then?

author: BrianHG
author_rank: Super Contributor
timestamp: October 09, 2021, 01:55:39 am
content: Part 2:Enjoy.

author: BrianHG
author_rank: Super Contributor
timestamp: November 11, 2021, 03:03:40 am
content: Part 3, enjoy!

author: BrianHG
author_rank: Super Contributor
timestamp: November 26, 2021, 09:21:45 pm
content: Part #4, enjoy:

author: thinkfat
author_rank: Unknown
timestamp: November 26, 2021, 10:13:51 pm
content: waiting for the next part

author: BrianHG
author_rank: Super Contributor
timestamp: November 27, 2021, 01:02:51 am
content: Quote from: thinkfat on November 26, 2021, 10:13:51 pmThey are doing it really slow....

author: BrianHG
author_rank: Super Contributor
timestamp: December 01, 2021, 06:26:21 am
content: Part #5, Enjoy...

author: BrianHG
author_rank: Super Contributor
timestamp: December 02, 2021, 12:23:51 pm
content: Now they are beginning to pump. Part #6, Enjoy:

author: TheSteve
author_rank: Unknown
timestamp: December 02, 2021, 03:47:47 pm
content: Very pleased to see Keysight has decided to sponsor Marc's channel - an excellent choice.

author: BrianHG
author_rank: Super Contributor
timestamp: December 05, 2021, 04:15:30 am
content: An part 7, Enjoy:

author: BrianHG
author_rank: Super Contributor
timestamp: December 16, 2021, 08:41:16 am
content: Part #8, now with the timing:

author: BrianHG
author_rank: Super Contributor
timestamp: January 18, 2022, 10:23:24 pm
content: Part #9: Talk about those beautiful digit displays...

author: BrianHG
author_rank: Super Contributor
timestamp: March 04, 2022, 05:20:25 pm
content: Part 10:Part 11:Part 12:Part 13: (Finally, the first deep penetration.)

author: Terry Bites
author_rank: Super Contributor
timestamp: March 07, 2022, 05:35:59 pm
content: Utter filth- shame on you!

author: TimFox
author_rank: Super Contributor
timestamp: March 07, 2022, 05:48:31 pm
content: In Part 7, what is the purpose of the illuminated switch labeled "21 Hz 400 Hz"? I know 400 Hz is a common power distribution in aircraft, but have never seen 21 Hz anywhere.

author: free_electron
author_rank: Super Contributor
timestamp: March 07, 2022, 06:41:46 pm
content: not much of a teardown ... i want to see the actual circuitry !

author: jmelson
author_rank: Super Contributor
timestamp: March 08, 2022, 06:34:54 pm
content: Quote from: TimFox on March 07, 2022, 05:48:31 pmLikely it is the lock bandwidth of the phase lock loop.Jon

author: schmitt trigger
author_rank: Super Contributor
timestamp: March 08, 2022, 06:44:24 pm
content: I find it beyond fascinating how 50+ years ago engineers managed to design what they were required to design. With the limited available technology, as compared to the modern one.So it it does qualify as porn to me.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 08, 2022, 06:49:46 pm
content: Quote from: free_electron on March 07, 2022, 06:41:46 pmThis is as close as I can get you to 1960s RF stuff...https://w140.com/tekwiki/wiki/1L20http://ki3u.byethost3.com/Radio-PhysicsDIR/Substitute_uhf_osc_tubes_for_Tek_1L20.html?i=1

author: TimFox
author_rank: Super Contributor
timestamp: March 08, 2022, 08:00:23 pm
content: In Part 9, the beautiful digital display did not use Nixie tubes, but back-projected characters. Each possible character had an incandescent light, a small transparency with the character on it, and a lens focused on the back of a screen.I remember seeing them on digital counters in the early '70s, but can't remember the manufacturer. I did find this US patent:https://patents.google.com/patent/US3041600An advantage was the capability of projecting arbitrary characters if you made the correct transparency, including +/-, units, or other messages.

author: BrianHG
author_rank: Super Contributor
timestamp: March 09, 2022, 12:10:28 pm
content: Quote from: free_electron on March 07, 2022, 06:41:46 pmI believe some of the units are on loan and since they are functional, they are too afraid of irreparably damaging something.All it takes it one bending of a mid-air inductor spring to make re-tuning the thing impossible unless they have the complete tuning guide.

author: BrianHG
author_rank: Super Contributor
timestamp: March 25, 2022, 12:01:13 am
content: Part 14:

author: BrianHG
author_rank: Super Contributor
timestamp: March 29, 2022, 05:38:22 pm
content: Part 15:

author: BrianHG
author_rank: Super Contributor
timestamp: May 07, 2022, 08:56:39 am
content: Part 16: (see a reflection of a ham radio transmission to moon and back to earth)

author: BrianHG
author_rank: Super Contributor
timestamp: July 03, 2022, 10:12:10 pm
content: Some real sexy shots, #17: (Yes it's part 17, there is a typo in the beginning slide)Some home made board replacements #18:

author: BrianHG
author_rank: Super Contributor
timestamp: July 24, 2022, 05:46:48 am
content: Part 19: It's complicated...

author: BrianHG
author_rank: Super Contributor
timestamp: July 25, 2022, 09:06:31 pm
content: Part 20:They got it working...

author: BrianHG
author_rank: Super Contributor
timestamp: August 21, 2022, 05:51:05 am
content: Part 21:

author: BrianHG
author_rank: Super Contributor
timestamp: November 11, 2022, 02:00:59 am
content: Part 22:Part 23:

author: BrianHG
author_rank: Super Contributor
timestamp: December 09, 2022, 08:50:49 am
content: Part #24:

author: BrianHG
author_rank: Super Contributor
timestamp: October 08, 2024, 11:14:28 pm
content: Part 25:Part 26:Part 27:Part 28:Part 29:Part 30:Part 31:Part 32:Part 33:Part 34:

author: BrianHG
author_rank: Super Contributor
timestamp: September 21, 2025, 08:46:41 am
content: Apollo Comms Part 35: PCM Telemetry - Power UpWow, in 1969, PCM encoded 365 analog signals plus 304 digital signals plus serial link stream from the Apollo Guidance Computer, all without a single modern ICs. Try to do this today without a modern MCU.

author: iMo
author_rank: Super Contributor
timestamp: September 21, 2025, 09:34:07 am
content: Any datasheet on the 3N68 3N69 3N70 INCH transistors/chips??Except the shot in the video I've found this below (NRAO in August 1963, on the last page):So my bet Marc et al. will do with the same schematics in the next episode..

author: ch_scr
author_rank: Frequent Contributor
timestamp: September 21, 2025, 09:45:39 am
content: Found this "second source" datasheet from New Jersey Semi Conductor

author: iMo
author_rank: Super Contributor
timestamp: September 21, 2025, 09:51:56 am
content: Some of them could be pretty useful for a Tayloe RF mixer (short wave)..