Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 2 Vote(s) - 4.5 Average
  • 1
  • 2
  • 3
  • 4
  • 5

47-1230 Capacitors
#34

You can often align AM acceptably by ear. I don't think the exact IF frequency matters too much as long as all the IFs are peaked the same as each other. I did several radios this way before I had the signal generator and VTVM.

Warm up your radio. From the alignment instructions that came with the schematic figure out which IF compensators to adjust and in what order. Tune to a medium strong station. Peak each compensator in the order given to find the highest audible signal. Do this several times. Then find a weaker station and do it two or three times more. It goes pretty fast once you've done it the first time. You have to wait until there is some steady music or someone talking without much dead air, but you can get close.

To align the dial, follow the instructions for the dial alignment except instead of injecting low and high frequency RF from the signal generator, use a high and low station near the frequencies they suggest. Adjust the compensators as instructed. If the alignment instructions say to set the signal generator to 700 KHz and 1500 KHz for alignment, and you can pick up stations at 680 and 1530, no big deal, just use them and set the dial appropriately at 680 and 1530 or whatever station you use. Again, peak by ear, and you should be close enough.

I'm not sure if you can align FM by ear or not. The only FM receiver I've aligned was difficult even with a signal generator and VTVM. A scope might make it easier.

John Honeycutt


Messages In This Thread
47-1230 Capacitors - by Warren - 07-03-2013, 02:19 PM
RE: 47-1230 Capacitors - by exray - 07-04-2013, 06:27 AM
RE: 47-1230 Capacitors - by morzh - 07-04-2013, 11:26 AM
RE: 47-1230 Capacitors - by codefox1 - 07-04-2013, 11:38 AM
RE: 47-1230 Capacitors - by Warren - 07-04-2013, 06:15 PM
RE: 47-1230 Capacitors - by Mondial - 07-04-2013, 06:28 PM
RE: 47-1230 Capacitors - by Warren - 07-04-2013, 07:07 PM
RE: 47-1230 Capacitors - by Mondial - 07-04-2013, 07:54 PM
RE: 47-1230 Capacitors - by morzh - 07-04-2013, 08:00 PM
RE: 47-1230 Capacitors - by Mondial - 07-04-2013, 08:15 PM
RE: 47-1230 Capacitors - by morzh - 07-04-2013, 09:04 PM
RE: 47-1230 Capacitors - by Warren - 07-04-2013, 10:51 PM
RE: 47-1230 Capacitors - by morzh - 07-05-2013, 12:20 PM
RE: 47-1230 Capacitors - by Warren - 07-08-2013, 01:46 PM
RE: 47-1230 Capacitors - by morzh - 07-08-2013, 08:11 PM
RE: 47-1230 Capacitors - by Warren - 07-08-2013, 08:44 PM
RE: 47-1230 Capacitors - by Warren - 07-19-2013, 01:45 PM
RE: 47-1230 Capacitors - by Chuck Schwark - 07-19-2013, 02:12 PM
RE: 47-1230 Capacitors - by Warren - 07-19-2013, 02:28 PM
RE: 47-1230 Capacitors - by codefox1 - 07-19-2013, 03:02 PM
RE: 47-1230 Capacitors - by Warren - 07-19-2013, 08:24 PM
RE: 47-1230 Capacitors - by BrendaAnnD - 07-19-2013, 09:18 PM
RE: 47-1230 Capacitors - by Warren - 07-19-2013, 11:37 PM
RE: 47-1230 Capacitors - by BrendaAnnD - 07-20-2013, 12:59 AM
RE: 47-1230 Capacitors - by Mondial - 07-20-2013, 09:02 AM
RE: 47-1230 Capacitors - by Warren - 07-20-2013, 05:02 PM
RE: 47-1230 Capacitors - by Mondial - 07-20-2013, 11:46 PM
RE: 47-1230 Capacitors - by Warren - 07-21-2013, 01:25 AM
RE: 47-1230 Capacitors - by Warren - 01-20-2014, 12:38 AM
RE: 47-1230 Capacitors - by Warren - 01-21-2014, 12:58 AM
RE: 47-1230 Capacitors - by Marsupial - 01-22-2014, 03:44 PM
RE: 47-1230 Capacitors - by Warren - 01-22-2014, 03:58 PM
RE: 47-1230 Capacitors - by Marsupial - 01-23-2014, 05:34 PM
RE: 47-1230 Capacitors - by Raleigh - 01-24-2014, 12:12 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM

[-]
Who's Online
There are currently 2631 online users. [Complete List]
» 2 Member(s) | 2629 Guest(s)
AvatarAvatar

>