Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

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
"Let us begin to do good"- St. Francis

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
under chassis parts locator diagram for 1938 Zenith 9s262
Has anyone gone to the trouble of creating an under chassis parts locator image?  Yes, I can identify components by foll...bobloney — 08:57 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Try looking at this site the book mark is for a old generator that I was given. David    https://radionerds.com/index.ph...David — 08:36 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM

[-]
Who's Online
There are currently no members online.

>