The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

If you need more swing than the radio will do from stock. Then you will most likely need to do some sort of swing modification, as it not something we do hear in the UK. You will need to do a search on the forum or do a search on Google and if you do not find what you are look for, then put a new p...

Try replacing TR51, the transistor bolted to the side of the radio near the power socket right hand side. ok rick i changed tr51 b754 with a new 1. the radio still the same. this is what i have on power settings. low power dead keys 1 watt and will swing up to 2 watts. medium power dead keys 2 watt...

You do not say if you DX33 is the HML or the HP model. Check the choke on the back of the mike socket, it maybe O/C. thanks rick the L501 choke on the back of the mike socket was causeing the buzzing.the only thing now is the radio has no forward swing just alittle.i have adjusted all the modge pot...

You do not say if you DX33 is the HML or the HP model. Check the choke on the back of the mike socket, it maybe O/C. thanks for the reply rick my bad its a dx-33hml.i did chang c128 as stated above but the radio is still the same.i will check the choke on the back of the mike socket.i will let you ...

i have a galaxy dx 33. when i key the mike with the radio on high power it keys up 3 watts with a buzzing sound and no forward swing but has audio on the talk back. i can set the radio on medium power and it will key up 2 watts with just alittle forward swing and no buzzing. the same for low power....

i have a galaxy dx 33. when i key the mike with the radio on high power it keys up 3 watts with a buzzing sound and no forward swing but has audio on the talk back. i can set the radio on medium power and it will key up 2 watts with just alittle forward swing and no buzzing. the same for low power.k...

sorry for the remark james .i guess i was haveing a bad day.i got the radio up and running. it was a bad tr51 it had 13v first pin and the other 2 where dead. i replace the tr51 b754 with a new 1 and problem fix. once again sorry for the remark.have a nice day unit.

well to start with i didnt no i was to use the post reply. but yes the tx light changs color when you key the mike. i was told by a good freind of jp when i joind this site that i would meet some rude people.but hey have a nice day unit.

I will try one more time. Is the RX/TX led change colour when you key-up? What is the voltage at the collector pass regulator TR51 in the TX mode on AM; this is the transistor, which is bolted to the chassis near the rear right corner. and what is the voltage at the collector of TR38. It will not h...

I will try one more time. Is the RX/TX led change colour when you key-up? What is the voltage at the collector pass regulator TR51 in the TX mode on AM; this is the transistor, which is bolted to the chassis near the rear right corner. and what is the voltage at the collector of TR38. It will not h...

if you got it to key up briefly will wiggling around on pc board..you have a poor solder connection....with unit powered up.key it up and bump on the foil side of pc board with the but end of a plastic handle screwdriver..if you see it key on your meter..then find you a plastic scratch tool..i use ...

Is the RX/TX led change colour when you key-up? What is the voltage at the collector pass regulator TR51 in the TX mode on AM; this is the transistor, which is bolted to the chassis near the rear right corner could u give me the right voltage readind for tr51 . and also do u know what number the ke...

First you may want to check the mic cable. Start with the lil things first. ok i checked the mike on another radio and it work fine. i did notice while i had the radio opened up looking arround the radio key up for just a second and then nothing again. have tryed many working mikes on this radio an...

First you may want to check the mic cable. Start with the lil things first. ok i checked the mike on another radio and it work fine. i did notice while i had the radio opened up looking arround the radio key up for just a second and then nothing again. have tryed many working mikes on this radio an...

this is my first post hope i do it rite. i have a superstar 3900 plus.it was working fine when i went to bed. when i got up and turn it on today it wont key up . theres no key up on am or ssb. receive on the radio is fine.any ide where to start on this radio to fix the problem. thanks for any help--...