Major M588 ptbm059 am/fm frequence issue.
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Major M588 ptbm059 am/fm frequence issue.
I donno what is wrong with Major M588 frequencies,WHY there is so big difference between modulations?.
Powersupply 13.8v
ch20 tx freq
FM 27.204663MHz
AM 27.205043MHz
X1 10.240 crystal freq
10.240000MHz
Compare to Ham multimode 2 ptbm059
ch20 tx freq
FM 27.205518MHz
AM 27.205617MHz
X1 10.240 crystal freq
10.240002MHz
http://ham-international.nuxit.net/PTBM ... glages.htm
Anyone have better alignment brochure?
Edit.
There seems to be a bit different parts on the PTOS006AOX board.
Major
R26 100ohm
R23 18k ohm
R27 2.2k ohm
Multimode 2
R26 680ohm
R23 8,2k ohm
R27 1,2k ohm
Powersupply 13.8v
ch20 tx freq
FM 27.204663MHz
AM 27.205043MHz
X1 10.240 crystal freq
10.240000MHz
Compare to Ham multimode 2 ptbm059
ch20 tx freq
FM 27.205518MHz
AM 27.205617MHz
X1 10.240 crystal freq
10.240002MHz
http://ham-international.nuxit.net/PTBM ... glages.htm
Anyone have better alignment brochure?
Edit.
There seems to be a bit different parts on the PTOS006AOX board.
Major
R26 100ohm
R23 18k ohm
R27 2.2k ohm
Multimode 2
R26 680ohm
R23 8,2k ohm
R27 1,2k ohm
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Re: Major M588 ptbm059 am/fm frequence issue.
Is anyone having same issue?.
I own 5pcs M588 and all same problem.
Is there some component or voltage diference somewhere why MM2 is a bit better am/fm stability.
I own 5pcs M588 and all same problem.
Is there some component or voltage diference somewhere why MM2 is a bit better am/fm stability.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
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Re: Major M588 ptbm059 am/fm frequence issue.
Is there any difference in voltage on the emitter of Q44 when you change modes?
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Re: Major M588 ptbm059 am/fm frequence issue.
Not much.
I looked from schema it should be 9,4v
13.8v psu
Major
RX
FM 9.26V
AM 9.27V
USB 9.25V
LSB 9.25V
TX non modulated
FM 9.17V
AM 9.18V
USB 9.20V
LSB 9.20V
MM2
RX
FM 9.60V
AM 9.61V
USB 9.59V
LSB 9.59V
TX non modulated
FM 9.49V
AM 9.50V
USB 9.55V
LSB 9.55V
I looked from schema it should be 9,4v
13.8v psu
Major
RX
FM 9.26V
AM 9.27V
USB 9.25V
LSB 9.25V
TX non modulated
FM 9.17V
AM 9.18V
USB 9.20V
LSB 9.20V
MM2
RX
FM 9.60V
AM 9.61V
USB 9.59V
LSB 9.59V
TX non modulated
FM 9.49V
AM 9.50V
USB 9.55V
LSB 9.55V
Last edited by pienari on 06 Jun 2017, 19:25, edited 1 time in total.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
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Re: Major M588 ptbm059 am/fm frequence issue.
I measured a bit more.
TX on IC3 pin 1
Major
FM 10.695002MHz
AM 10.695002MHz
MM2
FM 10.695015MHz
AM 10.695015MHz
So that is fine or maybe a bit high to Multimode.
I think i have to measure voltages if there is something ...
TX on IC3 pin 1
Major
FM 10.695002MHz
AM 10.695002MHz
MM2
FM 10.695015MHz
AM 10.695015MHz
So that is fine or maybe a bit high to Multimode.
I think i have to measure voltages if there is something ...
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
- Ashtec
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Re: Major M588 ptbm059 am/fm frequence issue.
If i was you i would see how the radio is frequency modulated...
ie....By the xtals or is it by a conversion to the vco...
I say this as it looks when in FM mode the frequency is dropping or being dragged down.
ie....By the xtals or is it by a conversion to the vco...
I say this as it looks when in FM mode the frequency is dropping or being dragged down.
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Re: Major M588 ptbm059 am/fm frequence issue.
Hello Ashtec
Happy to see you here
@+
Claude
Happy to see you here
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Claude
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Re: Major M588 ptbm059 am/fm frequence issue.
Only 22ohm bias mod on Major.
I donno what mod is made to MM2 but channel guard and maybe some kinda microphone preamp.
I have to look osciloscope and spectrum analyzer how both act with TX.
I donno what mod is made to MM2 but channel guard and maybe some kinda microphone preamp.
I have to look osciloscope and spectrum analyzer how both act with TX.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
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Re: Major M588 ptbm059 am/fm frequence issue.
Another 588 arrived and this time Black spirit moded.
I have to check this too.
I have to check this too.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
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Re: Major M588 ptbm059 am/fm frequence issue.
Problem maybe solved atm.
I have to make aligment again and after that i can say if it helped.
All M588 same issue and manufactured wrong because 9v voltage coming from FM/AM/SSB selector AM without diode and FM thru diode so it drop about 0.5v.
So i added diode both and frequence is really stable . 27.205 FM -> 27.205387 . AM -> 27.205400.
I have to make aligment again and after that i can say if it helped.
All M588 same issue and manufactured wrong because 9v voltage coming from FM/AM/SSB selector AM without diode and FM thru diode so it drop about 0.5v.
So i added diode both and frequence is really stable . 27.205 FM -> 27.205387 . AM -> 27.205400.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
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Re: Major M588 ptbm059 am/fm frequence issue.
Same issue this one too.
Paljon pilalle tinailtuja koneita.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
Mobile. Ham concorde3, Megawatt 4000,Zetagi B550p.
Home. Colt Excalibur SSB , 2el Quad, Diy ldmos amp 1.6kw pep.
- Ashtec
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Re: Major M588 ptbm059 am/fm frequence issue.
Interesting to know.
- cb4ever104
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Re: Major M588 ptbm059 am/fm frequence issue.
30TM060
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Handle "Fortune Hunter" back in "the day"
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Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: Major M588 ptbm059 am/fm frequence issue.
Glad to be back..