| Author |
Message |
    
Radiodude
Advanced Member
Username: Radiodude
Post Number: 550
Registered: 1-2002
| | Posted on Saturday, May 10, 2008 - 8:15 pm: | 
|
I just received a Telsat 1023 with extra channels. The radio keys up and shows wattage BUT no modulation.
I have tried other mics but still no mod! Can you give me some idea where to start to look for the problem?
Thanks
Ernie
KC8YOQ
Copper 123
Walkie Talkie
2NA750
|
Bruce
Senior Member
Username: Bruce
Post Number: 4709
Registered: 9-2003
| | Posted on Sunday, May 11, 2008 - 7:32 am: |
|
Stupid question but did you check the PA switch?
On 6 since 66
|
Radiodude
Advanced Member
Username: Radiodude
Post Number: 551
Registered: 1-2002
| | Posted on Monday, May 12, 2008 - 12:22 pm: |
|
Bruce you always come up with the good ones. YES I thought about that and yes I did LOL
Ernie
KC8YOQ
Copper 123
Walkie Talkie
2NA750
|
Bruce
Senior Member
Username: Bruce
Post Number: 4711
Registered: 9-2003
| | Posted on Monday, May 12, 2008 - 1:36 pm: |
|
The PA switch has given many a tech heartburn .....
If you know the audio hot pin try seeing if you can hear anything if you put a wire/probe on it.
Speaking of audio i'm asuming that it is receiving ..... If it is then that rules out the audio amp and leaves you with the mike preamp ckt.
99% of thoes radios had dynamic mikes with no preamps if all else fails you can try using a speaker for a mike.
An't broken radios FUN .......
On 6 since 66
|
2ir473
Intermediate Member
Username: 2ir473
Post Number: 142
Registered: 7-2002
| | Posted on Wednesday, May 14, 2008 - 7:47 am: |
|
Does your radio receive a signal?
Do you hear audio coming from the speaker?
I had a Lafayette Telsat SSB-140 which had RF output on AM (4w carrier, but no modulation on AM or on SSB. Also, the S-meter indicated a received signal but no audio would be heard through the speaker. I found the audio chip was bad and replaced it. All works fine now.
Perhaps you have a similar problem?
Paul
2IR473
CEF-218/ham #107
CDX8412
|
Radiodude
Advanced Member
Username: Radiodude
Post Number: 552
Registered: 1-2002
| | Posted on Saturday, May 17, 2008 - 6:16 pm: |
|
Radio rx's fine! Keys up and shows wattage BUT no modulation. It has me baffeled! I tried othe Lafayette mics with the same result. Guy i got it from "said" it worked fine before he shipped it!
More ideas please
Ernie
KC8YOQ
Copper 123
Walkie Talkie
2NA750
|
Hotwire
Senior Member
Username: Hotwire
Post Number: 2484
Registered: 1-2005
| | Posted on Sunday, May 18, 2008 - 7:42 am: |
|
You are positive that it is not a mic or mic socket problem. Receive works normal.
It keys up, shows a little wattage?
I would be replacing the RF final and or driver final. good luck
KEEP IT REAL!
Kenny
cef491(27.115lsb)
2sf491(27.555usb)
Indiana
|
Radiodude
Advanced Member
Username: Radiodude
Post Number: 553
Registered: 1-2002
| | Posted on Sunday, May 18, 2008 - 9:37 pm: |
|
Yeah thats what I thought also I guess i will do that!
Ernie
KC8YOQ
Copper 123
Walkie Talkie
2NA750
|
