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

AM transmitter issues
#3

+1 on what Vinzer said. However, check the carrtridge. Most "phono" preamps, especially those little boxes with no controls) are for magnetic cartridges. If the RC/88 has a crystal or ceramic cartridge in it, it will overdrive a magnetic preamp. Plug the preamp that the RC88 is feeding into the "line level" input of an amp, to confirm that it works. If the Spitfire has a "line level" input and the phono and preamp are functional, distortion should not be an issue. Otherwise, get a 100K audio taper pot, connect the output of the preamp between the 2 outer legs (ensure the leg closest to minimum is the common), and the transmitter between the center (wiper) contact and the common leg.

Hopefully this works.

Re the SSTRAN, I understand that they stopped making them but still support them. If possible, tune the SSTRAN to an OCCUPIED channel, turn it off and tune that channel on the radio. Power up the SSTRAN. If no difference is heard, the transmitter is dead. I don't know how many stages that there are to the transmitter, but either the oscillator, RF amp or power is the issue. If the unit was run without an antenna or a poorly matched antenna, the output transistor may have blown (although these are only 100mW units and I hope that the output transistor was a little heftier than that). Do you have a schematic? Post it, and we all will see if we can help. I don't have the SSTRAN (I have a Vector kit and a Talking House) but several other Phriends on the Phorum do have them.

"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards, 

MrFixr55


Messages In This Thread
AM transmitter issues - by oldschoolphotoguy - 04-15-2023, 06:39 PM
RE: AM transmitter issues - by vinzer - 04-15-2023, 08:03 PM
RE: AM transmitter issues - by MrFixr55 - 04-16-2023, 10:37 AM
RE: AM transmitter issues - by Radioroslyn - 04-16-2023, 12:02 PM
RE: AM transmitter issues - by radiorich - 04-16-2023, 02:33 PM
RE: AM transmitter issues - by oldschoolphotoguy - 04-21-2023, 05:51 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
IF can wire size and Rubber mounts?
Thanks for the info but I doubt that a hardware store would be carrying the proper tuner assembly support mountings for ...georgetownjohn — 10:38 PM
12' Philco
Perhaps Kareem Abdul Jabbar?GarySP — 10:33 PM
My last cabinet for this year
Outstanding work, Dan! Take care and BE HEALTHY! GaryGarySP — 10:31 PM
My last cabinet for this year
They are a nice looking radio, Stromberg. I have a small tabletop octagon-dial one. It sounds surprisingly nice. And t...morzh — 09:40 PM
Philco 41-608 changer coupler
Different years but the same idea.morzh — 09:38 PM
My last cabinet for this year
That’s a beauty! :thumbup:klondike98 — 09:24 PM
Philco 41-608 changer coupler
Hi Morzh, I've searched using Mondial as the user name with various keywords such as 'coupler', 'motor', 'idler', 'p...alangard — 08:31 PM
Philco 16B Parts
I think the chassis is painted.morzh — 08:13 PM
Philco 38-2 Automatic Tuning
Honestrly, the original is quite acceptable and, it seems to me, can be cleaned.morzh — 08:11 PM
Philco 41-608 changer coupler
Mondial left a thread about remanufacturing thois type coupler.morzh — 08:09 PM

[-]
Who's Online
There are currently 2870 online users. [Complete List]
» 1 Member(s) | 2869 Guest(s)
Avatar

>