Texas Star 500v

[tunercars]

when i turn on the 500v the receive cuts out what can cause this power output from the amp is normal but when the delay is pushed in for SSB it don't delay turn the amp off and receive comes back

 

[Dmans]

what can cause this

Dirty relay contacts.

73
David

 

[tunercars]

Dirty relay contacts.

73
David

i thought that too but it keys on and off am just fine but receive is out as soon as i turn the amp on and comes back as soon as i turn the amp off

 

[144inBama]

i thought that too but it keys on and off

That just means it is "mechanically" working.... The actual contacts are "pads" on the armature (part the moves back and forth when you key/unkey) and the fixed NO/NC (normally open/ normally closed) post. Every key causes a little ach and over time the surfaces become too worn or corroded to make good contact. You can, most of the time, remove the cover and lightly sand the surface with some 3K grit paper like you would the points in an old car.

 

[tunercars]

That just means it is "mechanically" working.... The actual contacts are "pads" on the armature (part the moves back and forth when you key/unkey) and the fixed NO/NC (normally open/ normally closed) post. Every key causes a little ach and over time the surfaces become too worn or corroded to make good contact. You can, most of the time, remove the cover and lightly sand the surface with some 3K grit paper like you would the points in an old car.

ill try that but its new so it shouldn't do that so soon i did take the cover off and look inside it seems to look okay ? ill get a pic and show you i can take the cover off the relay and look at it to while im at it i agree it has to be relay related as its not clicking like it should could the relay be stuck ?

 

[144inBama]

It could very well be the relay is not working correctly. Use an Ohm meter to check continuity when keyed and unkeyed at the SO-239s. follow "this" video to manually key the circuit. Also, does the pre-amp affect the receive in any way?

 

[tunercars]

It could very well be the relay is not working correctly. Use an Ohm meter to check continuity when keyed and unkeyed at the SO-239s. follow "this" video to manually key the circuit. Also, does the pre-amp affect the receive in any way?

okay so what's happening is the relay is turning on as soon as the amp is turned on i tapped on it to see if i could get it to break the contact and the meter light went out and it moved very little but still making contact so i turned it off and the relay went to the off position and as soon as i turned it back on it went right back to being in the transmit mode what would make the relay make contact as soon as the amp is turned on ?

 

[Shadetree Mechanic]

Sounds like the amplifier is going into oscillations. Like something is wrong with the output tune or something else is wrong inside the amp.

 

[groundwire]

i have seen ground loops cause it as well

 

[144inBama]

okay so what's happening is the relay is turning on as soon as the amp is turned on i tapped on it to see if i could get it to break the contact and the meter light went out and it moved very little but still making contact so i turned it off and the relay went to the off position and as soon as i turned it back on it went right back to being in the transmit mode what would make the relay make contact as soon as the amp is turned on ?

No radio connected, it keys? If so, I'd say use the circuit in the video I posted as a troubleshooting tool. Sounds like the keying circuit or component is shorted as done in the video.

 

[tunercars]

No radio connected, it keys? If so, I'd say use the circuit in the video I posted as a troubleshooting tool. Sounds like the keying circuit or component is shorted as done in the video.

yeah i think its the keying transistor i got a hold of john at galaxy i have to call him back later today but that would he thinks as well

 

[tunercars]

i have seen ground loops cause it as well

no it went form working to not and then replaced the fuses and the relay stays on when the amp is turned on and back off when its turned off if it was a ground loop it would have done it before now

 

[tunercars]

Sounds like the amplifier is going into oscillations. Like something is wrong with the output tune or something else is wrong inside the amp.

no its to do with the relay or keying transistor it dose it without a radio being connected to it so no RF going to the amp

 

[Ranch55]

Sounds as if the keying transistor is shorted.....
Whichever it is, it's an easy fix.
Texas Star amplifiers are not complicated. Sometimes take a little time to pin point the issue, but I have repaired/rebuilt quite a lot of Texas Star amps.
The TS 350 and 500 are the easiest to repair, if it's not all burnt up.....

 

[tunercars]

Sounds as if the keying transistor is shorted.....
Whichever it is, it's an easy fix.
Texas Star amplifiers are not complicated. Sometimes take a little time to pin point the issue, but I have repaired/rebuilt quite a lot of Texas Star amps.
The TS 30 and 500 are the easiest to repair, if it's not all burnt up.....

right it works otherwise so just trying to get it figured out