Cannot Adjust an IF Transformer’s cores - Printable Version
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+--- Thread: Cannot Adjust an IF Transformer’s cores (/showthread.php?tid=25151)
RE: Cannot Adjust an IF Transformer’s cores - slford310 - 08-11-2024
Great work, we are all looking forward to the final design.
462ron - 462ron - 08-12-2024
Hi Joseph, here is a great article on various types of FM detectors including the FM1000…https://www.radiomuseum.org/forumdata/users/4942/file/FM%20Alignment%20Ghirardi%201952%20OCR.pdf
Ron
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-12-2024
Thank you for sharing! I am going to take some time to review and soak this all in.
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-20-2024
Just a quick update, folks. The PCBs have been manufactured, and shipped yesterday. Surely they’ll arrive this week. I also just submitted an order for the connectors I will need between the two PCBs. We should have a working IF transformer by the end of the week.
RE: Cannot Adjust an IF Transformer’s cores - slford310 - 08-20-2024
Awesome!!
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-24-2024
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original insides, and soldered the new assembly to it. Then I put the metal can on top. I need to complete the full alignment (at long last), but I was able to tune into a few stations quite clearly. And the nice part is that it looks original!
RE: Cannot Adjust an IF Transformer’s cores - RodB - 08-24-2024
Joseph, now you are an engineer!!
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-24-2024
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a summary of the process we went through in the Electrical Restoration category. I realize now that this thread should have been there, but that’s okay.
RE: Cannot Adjust an IF Transformer’s cores - GarySP - 08-24-2024
The abilities of our 'Phorum Pholks" never ceases to amaze me! Fantastic fabrication, Joseph! I'm waiting now for your PCB solution to the FM1000 tube scarcity. Come up with that and you would make A LOT of hobbyists happy! Take care and BE HEALTHY! Gary
RE: Cannot Adjust an IF Transformer’s cores - slford310 - 08-25-2024
Outstanding work indeed. I wish I could come up with solutions like this.
462ron - 462ron - 08-25-2024
Joseph, this is beyond awesome. A lot of thought and engineering went into this and you hit a home run! Now I must save this thread for future reference. Thanks for posting!
Ron
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-27-2024
Thank you all! It would not have been possible without the guidance of everyone who has weighed in. So far I’ve gotten about 8 hours of playtime out of the radio with the new IF transformer. It’s working great, but I’ve had to wiggle the IF can a few times because audio has gone quiet. Wiggling the can does the trick. I’m suspecting I have a bad solder joint, so I will have to pop it back open to address that.
RE: Cannot Adjust an IF Transformer’s cores - jrblasde - 08-29-2024
I’ve taken the day off today, so I took a look at the IF transformer. I got lucky this time—there were no loose solder connections. The unit simply wasn’t fastened securely into the brass clip that holds it in place. This has resolved the audio issue.
RE: Cannot Adjust an IF Transformer’s cores - slford310 - 08-29-2024
Congrats on the easy fix. I will bookmark this great project for future use as I’m sure many others will as well.