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

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

duplicating stations top of band;bottom of band
#7

(08-05-2016, 06:20 PM)tomt Wrote:  
(08-04-2016, 10:48 PM)Radioroslyn Wrote:  Something else comes to mind, check the LO frequency to be sure it's on the high side of the signal and not the low side.

being away from any repairs for about 35 yeas makes it kind of hard! do you mean set to high side of 455kc if I missed a wire or got one wrong in wrong place on the band switch could this cause my problem. man I used to think I could work on radios some of these old ones will challenge me Thank for your help. ps I was looking at you gallery and seen your 84b; I have  one like it I am working on I got into vintage about a year ago having fun!!

What mean is the lo frequency must be 455kc above the incoming rf signal. For instance if you dial is set at 800kc the lo fq should at 1255kc. LO fq= dial fq + IF fq (your IF is 455kc) LO fq of 1255kc is 455kc above the 800kc that the dial is set to. You can listen for it in another reciever with the ant lead near the mixer tube.
Connecting a wire in the wrong place probably won't shift the oscilltor to the other side of the IF but it could cause some other issues that might cause your image problem.
I've been at it since the '60s when I was a kid and lately I had several real butt kickers! That 660L and thev42-854 where no picnic. It takes a lot of perseverance for sure!
On the 84 you need to replace all of the ecaps/foil paper and all of the resistors except the ww in the bias circuit. Rewiind the primary on the ant and osc coils and it will work swell!

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry


Messages In This Thread
RE: duplicating stations top of band;bottom of band - by Radioroslyn - 08-05-2016, 08:31 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
RCA T62 is playing.....
Beautiful set.morzh — 09:07 PM
An attempt to remove the Field Coil from a G speaker
Well....here it is. The green stuff. Unfortunately, probably penetrates deep. I opened the top layer and saw that: ...morzh — 08:58 PM
Philco 91 Restore Code ??
:clap: :clap: :clap: :clap: Really nice workmanship!!! Top of the chassis looks great. Sorry about the long winded e...MrFixr55 — 08:09 PM
Philco 40-120C Restoration
Thank you for your reply. I will check voltages on the other tubes, look at resistor 23 and cap 25, etc. If all else fai...bluecap — 07:58 PM
RCA T62 is playing.....
Nice looking set great save. DavidDavid — 07:48 PM
Philco 89 indicator light.
Hello Jim, I have done several 89s. The trick is to move the drum in or out on it's shaft. You will need to loosen a set...dconant — 07:36 PM
An attempt to remove the Field Coil from a G speaker
MrFixr Yes, it is my plan to go with 45rpm spider if I go that far. No, the pole was not left-handed as I unscrewed ...morzh — 07:14 PM
Philco 40-120C Restoration
Change the tube. Check the tube's bias network. Are any other tubes experience the drop or just this?` Is resistor 23 OK...morzh — 07:09 PM
Philco 89 indicator light.
I forgot how the pointer is formed: could you show the way it is formed and how you tried to change it?morzh — 07:01 PM
An attempt to remove the Field Coil from a G speaker
Was that pole piece left handed ? Since the metal "spider" is toast, wonder if you can either get the "4...MrFixr55 — 06:54 PM

[-]
Who's Online
There are currently 5577 online users. [Complete List]
» 4 Member(s) | 5573 Guest(s)
AvatarAvatarAvatarAvatar

>