Very interesting modification. I run mostly CW on my PRC-320. I did also find an official mod that improves the stability of the CW tone that is transmitted. I think its pretty cool that after all of the years of service these radios have provided, you can still find ways to improve them and still use them. 73!
Regrettfully, my unit (ser# 3505 PLA-81-51) doesn't look in the least like yours in that board on the back. I've closed it up now, but it had holes in the plate for adjustments, printing indicating test points, and the board was totally different. The final transistor was visible at the right side and no processor chip was visible. So, it's buttoned up and still works, thankfully. Mike VE3EQP .....>
Yes a very few Clansman 320s (late version) replaced the PA board in the 2a section to a move modern board featuring Mosfets to replace the earlier RF power transistors. Id say your is one of those.
Very interesting thank-you. Now this mod has been done a little while, have you found any long term problems, like overheating damage? Would you still recommend this as a mod? I've finally found and bought a decent 320 and would hate to fry or shorten the life of any components.
Still working beautifully, no overheating. Others have done this mod with no problems. You also should know you can increase the power out on your 320 by adjusting R2 potentiometer on the No2 unit just behind the power supply to approx 48 watts. gets a little hotter with reduced battery life but the 320 takes it OK!
@@vk2prc978 Thanks very much for the information and I'll certainly bear it in mind. I've only just got this unit and haven't had chance to use it at all yet. So, I'll get to know how it ticks in standard form before doing any mods. Thanks for your videos, they are really useful to this newcomer.
how are you measuring the output power with a dmm?,is it measuring the volts over the dummy load?,if so how do you translate the reading into watts?,cheers. 73
Sorry no video. Its just made up of 1K 3 watt metal film resistors in parallel to make a final load of 50 ohms. Filled with vegetable oil. works great. 2 copper wire rings inside to solder the resistors to.
As most know I am by far very technical, but this is a great mod. I cannot use high power just yet (M6) but I wonder if there is a drop on LP also ? Thank Alex very much appreciated 👌👌
Very interesting modification. I run mostly CW on my PRC-320. I did also find an official mod that improves the stability of the CW tone that is transmitted. I think its pretty cool that after all of the years of service these radios have provided, you can still find ways to improve them and still use them. 73!
Hi Alex
I finally got around to do this mod, great that you and your friend worked it out,
The clansman is working great now ,
Thanks Dave 2E0DMB
Thanks, much appreciated! Greetings from Norway :-)
Alexander, great video as usual
Regrettfully, my unit (ser# 3505 PLA-81-51) doesn't look in the least like yours in that board on the back. I've closed it up now, but it had holes in the plate for adjustments, printing indicating test points, and the board was totally different. The final transistor was visible at the right side and no processor chip was visible.
So, it's buttoned up and still works, thankfully. Mike VE3EQP .....>
Yes a very few Clansman 320s (late version) replaced the PA board in the 2a section to a move modern board featuring Mosfets to replace the earlier RF power transistors. Id say your is one of those.
Another excellent video Alex. Keep up the good work
Excellent! I will do this on my set too. Thanks for sharing.
Very interesting thank-you. Now this mod has been done a little while, have you found any long term problems, like overheating damage? Would you still recommend this as a mod? I've finally found and bought a decent 320 and would hate to fry or shorten the life of any components.
Still working beautifully, no overheating. Others have done this mod with no problems. You also should know you can increase the power out on your 320 by adjusting R2 potentiometer on the No2 unit just behind the power supply to approx 48 watts. gets a little hotter with reduced battery life but the 320 takes it OK!
@@vk2prc978 Thanks very much for the information and I'll certainly bear it in mind. I've only just got this unit and haven't had chance to use it at all yet. So, I'll get to know how it ticks in standard form before doing any mods. Thanks for your videos, they are really useful to this newcomer.
@@vk2prc978 Hi Alex
When you increase the power to 48W what is the output on the low power setting,
Thanks Dave
@@davidbrowne1588 That also goes up I carn't remember the exact amount but it would be over 10 Watts
@@vk2prc978 ok thanks for the information Alex,
Thanks Dave
how are you measuring the output power with a dmm?,is it measuring the volts over the dummy load?,if so how do you translate the reading into watts?,cheers. 73
Did you ever experiment enough to find out the effect of different value capacitors on the timing?
Hi Alex,
Great video - your dummy load looks home made, do You have a video on that? Is it oil cooled? Thanks ed
Sorry no video. Its just made up of 1K 3 watt metal film resistors in parallel to make a final load of 50 ohms. Filled with vegetable oil. works great. 2 copper wire rings inside to solder the resistors to.
As most know I am by far very technical, but this is a great mod. I cannot use high power just yet (M6) but I wonder if there is a drop on LP also ? Thank Alex very much appreciated 👌👌
There is no reduction in power on LP