UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Closed Thread
 
Thread Tools
Old 24th Feb 2019, 3:10 pm   #1
Ian - G4JQT
Heptode
 
Ian - G4JQT's Avatar
 
Join Date: Jun 2004
Location: Reading/Fakenham, UK.
Posts: 920
Default "Rocking-in" during alignment

This is something I should know, but never managed to pin down, and that's the procedure for "rocking" or "rocking-in" during receiver alignment.

Assume a standard MW/LW receiver with trimmers at the HF end of each band, and padders or adjustable inductors at the LF end of each band. At which end of the band is rocking effective?

By "rocking" I mean the gentle peaking of the test signal at the calibration point by alternatively tweaking the main tuning with the associated trimmer/padder for maximum signal, even if this moves the signal off the calibration point. And if it does, adjustments at the other end should bring it back. (All done because tracking is not linear, particularly if the LO and antenna tuning gang has identical sections which is usually the case.)

I'm minded to think this should be generally done at the LF end, and any tuning discrepancy corrected at the HF end with the trimmer - if there is one. Of course some sets only have preset adjustments at one end of the band in which case this is a moot point. Or is it...?

Thanks.

Ian

PS: Incidentally, this was discussed by Dick and Smithy from Radio and Electronics Constructor in the 70s, but of course their topics are not indexed anywhere so will take ages to locate!
Ian - G4JQT is offline  
Old 24th Feb 2019, 3:21 pm   #2
ms660
Dekatron
 
ms660's Avatar
 
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 8,358
Default Re: "Rocking-in" during alignment

https://www.americanradiohistory.com...rch=%22rocking alignment%22

https://www.americanradiohistory.com...RC-1964-04.pdf

Lawrence.
ms660 is online now  
Old 24th Feb 2019, 3:29 pm   #3
Ian - G4JQT
Heptode
 
Ian - G4JQT's Avatar
 
Join Date: Jun 2004
Location: Reading/Fakenham, UK.
Posts: 920
Default Re: "Rocking-in" during alignment

Excellent. Thank you! I've used that site before but forget it has a search facility! (It's a very good site.)
Ian - G4JQT is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 6:49 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.