Talk:AN/URM-25 signal generator
This is the talk page for discussing improvements to the AN/URM-25 signal generator article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
![]() | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||||||||||||||||
|
"How To" Overhaul Tips
editI have moved this out of the article space, as instructional guides are not the purpose of the encyclopedia. See WP:NOTMANUAL. - LuckyLouie (talk) 18:56, 15 January 2009 (UTC)
Large "how to" section removed from article
|
---|
Many of the units on the URM-25x series were paper (may look like Mica) and electrolytic, and the unit should be recapped.
The 400 Hz and 1 kHz modulator has several paper block capacitors: C160,C161 = 1000 pF 500V mica C162, C163 0.1 400V C159, C164, C165 0.01 300V C166, C167 0.2 120V
Several key coupling capacitors here can fail and lead to turret resistor damage and lots of current through R130. These are C135, C136 on the output of V103. Buffer unit is challenging to remove. C130 0.01 300V paper C131 150pF 300V mica C132 25 25v electrolytic C133 0.022 200V paper C135 0.01 300V mica C136 510pF 300V mica
Power supply B+ filter caps C201-C203 in the 25C and 25D are dry, paper non-polarized, even though they appear to be electrolytics. See the manual for verification for your unit. C601 in 25F is 4 mf paper as well.
The following may lose tolerance over time: Modulation Meter Circuit: R167, R168, R170, R171 R169 Meter potentiometer 2,500 ohms R130, 500 ohm attenuator input R144, 4700 if adjustment of R172 can't give enough output R141 on the step attenuator on the X1.0 setting
|
External links modified
editHello fellow Wikipedians,
I have just modified one external link on AN/URM-25D Signal Generator. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20081201111125/http://www.r-390a.net/Pearls/URM-25.pdf to http://www.r-390a.net/Pearls/URM-25.pdf
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}
).
This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}}
(last update: 5 June 2024).
- If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
- If you found an error with any archives or the URLs themselves, you can fix them with this tool.
Cheers.—InternetArchiveBot (Report bug) 06:44, 1 October 2016 (UTC)