Excalibur SSB base radio will work fine one day,not the next.
This transceiver is a moody *****.I did my best to look for any cold solder joints,power supply is reading 13.5 volts dc.the radio always lights up,but sometimes does not trans or receive,next day it could work fine....While I got your attention,I also have a old tube radio that popped 2 oil caps,a.1uf and a .047uf 600w v made by Atlas,they shot the foil out,is there a modern equivilant replacement? The radio is a Robyn T-123B.Thanks,Brozinski.
Re: Excalibur SSB base radio will work fine one day,not...
Might be worth checking the microphone cable on the transceiver, specially near the plug, or the push to talk switch. I saw this umpteen years ago with a CB that was intermittent.
High voltage capacitors are a bit hard to find but look on the net for vintage radio suppliers. While you have the tube radio open, look for resistors that gone high, this can put higher voltages than design on the caps and of course can quickly wreck tubes that were otherwise OK.
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Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx
If your receiver was operating previously but now the SSB option is not working, very likely the sideband detector has failed. I'm not directly familiar with your Yaesu unit but, in most Yaesu transceivers, the SSB chip and control circuit (including diodes) is identified in print on the main board.
Under some circumstances the transceiver’s internal
CPU may cause erroneous indications on the display.
If this happens, reset the CPU as follows:
While pushing [ENT] + , push [POWER] to turn
• The CPU is reset and the display at right appears. CAUTION: Resetting the CPU returns set mode
contents to their default values.
that's the quickest way to do it, hopefully you don't have alot of stored frequecies in memory.
The Yaesu FT-8900 is a quad band FM transceiver only. It can not be modified to receive or transmit AM, SSB, RTTY or CW. It works on all or portions of 70 centimeter, 2 meter, 6 meter and 10 meter bands. The 26.805 Mhz frequency is 11 meters, so it is out of range of the 10 meter band in the radio, it is close. Even if able expand the transceiver, the AM / SSB mode commonly found in this band makes it impossible to use. Further, the radio is not FCC Type Accepted for use in this band.
Have you checked the caqble that goes between the head and the radio. I have had radios come into my shop that have had bad cables or the cable connector on the board gets a cold solder joint. be sure to check the connector on the head and on the radio side. If this is not the problem then it's time to take it to your local ham store for service. If it's still under warranty then let the factory take care of it.
sounds like some loose solder joints. check power output with external meter to see if output is ok . i think youprobably have 2sc1969 finals init unles someone has changed them theyshould put about 25 watts if tuned correctly. also check the antenna a and antenna b switch to see if something has shorted across it inside cabinet.