Emerson R156 - Oscillator Coil Design Criteria & Build
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- Опубликовано: 13 сен 2024
- After getting the loudspeaker back together, I turn my attention to the winding of the oscillator coil. I'll share the details of my design spreadsheet in the future after evaluating the performance of the receiver, assuming the oscillator coil actually works and the receiver is closely performing as designed.
Music attributes:
Falls by Keith Kenniff
The schematic(s) for reference: www.nostalgiaai...
Riders 8-31 (Early)
Riders 9-5 (Late)
The playlist for the Emerson R156:
• Emerson R156 - Restora...
Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.
#restoreoldradios
#r156
I'll have to keep this particular video in mind if I ever come across this situation. It's a good one Don!
Much appreciated Steve and this will serve as a reference for me down the road as well. Best, Don
Very interesting presentation method. Thanks.
Glad you enjoyed it! Hope to have another one uploaded soon. Thanks again Jim. Best, Don
This is fascinating video on rebuilding the oscillator coil Don, it will be interesting to see how it works in the radio.
Thanks Jim. I powered it up today. Look for the video tomorrow. Hope this finds you doing well. Best, Don
I like how you built the coil. It would have been nice if you explained what awg wire you used and how you determined the number of turns to initially put on before you started trimming to get the inductance you needed. Otherwise good video.
I like the construction method.
Thanks for your feedback and taking time to reach out. I covered the design and shared my spreadsheet for download after posting this video. The AWG was #34 if I recall correctly. The playlist below has all of the videos that I published for the series. I think the 11th upload covers the design and some earlier videos may be informative as well. Thanks again for watching. All the best. Don
Emerson R156 - Restoration Journey
ruclips.net/p/PLjLu4V-71S1LPpJhNAOBbBlsRCi1wecO7
@@RestoreOldRadios thanks, i will check it out
nice job
Thanks! I appreciate it Dennis. Hope to power up the old radio this week. Best, Don
Awesome job on this Oscillator coil Don!
Thanks! Gregg, hope all is well with you. Best, Don
Did you check the self resonance point?
Curious to know at what point the inter-winding capacitance causes just the coil to oscillate...
The ticker winding is a 2 connection type or more like a _gimmick_ with only one connection? Sorry I don't know which tube is being used for the mixer.
The Peak LCR meter is something i have been considering picking up... very pricey though.
Cheers,
Eddy - the self resonant frequency of the BC band coil is 5.964 MHz w/ a calculated parasitic capacitance of 5.9 pF while the SW band coil is 5.208 MHz w/ a calculated parasitic capacitance of 5.48 pF. I’ll be publishing another video that shows the oscillator circuit later today and the spreadsheet I put together to simplify the inductance calculations or feel free to look at the video description for a link to the schematic for reference. Hope this helps and let me know if you have any additional questions. Best, Don
@@RestoreOldRadios - Thanks Don, that's a good update on the coil. Was curious about the number given the winding style you used.
Cheers,
Eddy - my earlier info on parasitic capacitance & self resonant frequency was inaccurate due to my o-scope capacitance and testing procedure. Still not perfect, but I think the following numbers below are much closer as follows:
BC band: 3.66pF @ 4.22301 MHz
SW band: 10.99 pF @ 9.6538 MHz
Best,
Don
Hey Don, where do your manual information from? I came across a great project to start again from. It is an old 1938 Silvertone 6123 Chassis 101.506 from the label inside the box and number on bottom of box. I got it for nothing non-working and looking underneath it appears all original.
Steven - one resource is: www.nostalgiaair.org/PagesByModel/381/M0017381.pdf Best, Don
@@RestoreOldRadios Thanks for the Web link.
Another one for Riders: worldradiohistory.com/Rider-Manual.htm
And the Beitman Supreme at: worldradiohistory.com/Beitman-Manual.htm
How did you tension the magnetic wire, Don?
Martin - laying the magnet wire on its side created enough tension. I also rotated the spool to create a slight angle back to the bobbin. Hope this helps. Best, Don
Broadcast coil inductance you said it is0.5 mh. Is it depend on variable capacitor value?
Thanks for sharing! Did you count turns with your Arduino. Take care and have a great day!
Ryan, I didn’t count turns at all and decided to place two markers on the bobbin denoting the start location and end point based on the calculated length of the coil for the predetermined design inductance. I’ll share more in a future video. Thanks for reaching out. Best, Don
@@RestoreOldRadios No problem! Thanks and take care.
hi, is there any difference for Hartley Oscillator coil?
Yes, check out this resource; chapter 3 covers the Hartley… Best, Don
www.worldradiohistory.com/BOOKSHELF-ARH/Technology/Sams-Books/Sams-Oscillator-Circuits-Adams.pdf