This probably has been pisted already but has anyone done this mod and have it work??
HIGH POWER MOD (30-35watts)
This will work for most EPT-069610Z Boards.
Install the parts listed below:
1. Q47 One additional 2sc1969 final with isolation hardware.
2. A heat sink should be bolted to the rear of the chassis after the conversion.
3.D91-1n4148 diode.
4. C209-390pf 5% 50mv mica capacitor.
5. C212-104uf 5% 50mv ceramic capacitor.
6. R242-22 ohm 1/8 watt 5% carbon film resistor
7. R243-150ohm 1/2 watt 5% carbon film resistor
8. L34-22uh conformal coated choke
9. Q47-2SC1969 Transistor
10. VR11-100 variable potentiometer.
And also maybe this mod and have it work or maybe do both?
RF Output Increase Modification
This modification will allow the DX959 & DX949 to exhibit the RF output and swing of the Galaxy DX-series 10-meter radios. The board was always capable of this type of output; it was simply choked off by the design engineers in order to meet FCC 11-meter specifications.
The first thing you need to do is turn up VR14 which is the AM high power variable. If you?ve already done the modulation improvements, you should be able to dead key about 8-10 watts and swing around 15 watts. 18 watts is probably the best you?ll get (using a peak-reading Bird wattmeter). Now, perform the following modifications:
Remove C218 (3pf) and discard.
Change C216 (470pf) to a 1000pf (100V mylar-type)
Remove C210 (470pf) and discard.
Remove C199 (560pf) and reinstall it in the C210 spot.
Adjust your dead key to around 5 watts. I was able to achieve average peak swing readings of around 35 watts. Depending on the audio input (voice or whistle), I was able to whistle myself to readings of over 40 watts peak! There was a slight decrease in modulation and it seemed as though I was really pushing it. I found that I was able to regain the modulation level by lowering the dead key (using the RF Power control on the radio face) to around 2.5 watts. This netted peak swing readings of just around 28 watts! More than enough given the fact that the modulation was over 95% and crystal clear! This is just about the same performance that I got from my Galaxy DX66V after performing the 1N4001 diode heavy swing modification. Like I alluded to earlier, this new radio has "the stuff." You just have to work slightly harder to get at it.
I did the first one and it don't work, I also installed a jumper in J91,
HIGH POWER MOD (30-35watts)
This will work for most EPT-069610Z Boards.
Install the parts listed below:
1. Q47 One additional 2sc1969 final with isolation hardware.
2. A heat sink should be bolted to the rear of the chassis after the conversion.
3.D91-1n4148 diode.
4. C209-390pf 5% 50mv mica capacitor.
5. C212-104uf 5% 50mv ceramic capacitor.
6. R242-22 ohm 1/8 watt 5% carbon film resistor
7. R243-150ohm 1/2 watt 5% carbon film resistor
8. L34-22uh conformal coated choke
9. Q47-2SC1969 Transistor
10. VR11-100 variable potentiometer.
And also maybe this mod and have it work or maybe do both?
RF Output Increase Modification
This modification will allow the DX959 & DX949 to exhibit the RF output and swing of the Galaxy DX-series 10-meter radios. The board was always capable of this type of output; it was simply choked off by the design engineers in order to meet FCC 11-meter specifications.
The first thing you need to do is turn up VR14 which is the AM high power variable. If you?ve already done the modulation improvements, you should be able to dead key about 8-10 watts and swing around 15 watts. 18 watts is probably the best you?ll get (using a peak-reading Bird wattmeter). Now, perform the following modifications:
Remove C218 (3pf) and discard.
Change C216 (470pf) to a 1000pf (100V mylar-type)
Remove C210 (470pf) and discard.
Remove C199 (560pf) and reinstall it in the C210 spot.
Adjust your dead key to around 5 watts. I was able to achieve average peak swing readings of around 35 watts. Depending on the audio input (voice or whistle), I was able to whistle myself to readings of over 40 watts peak! There was a slight decrease in modulation and it seemed as though I was really pushing it. I found that I was able to regain the modulation level by lowering the dead key (using the RF Power control on the radio face) to around 2.5 watts. This netted peak swing readings of just around 28 watts! More than enough given the fact that the modulation was over 95% and crystal clear! This is just about the same performance that I got from my Galaxy DX66V after performing the 1N4001 diode heavy swing modification. Like I alluded to earlier, this new radio has "the stuff." You just have to work slightly harder to get at it.
I did the first one and it don't work, I also installed a jumper in J91,