Yes but wait! Are you saying that by turning the channel selector, you're actually making the adjustment? I must guess that you are saying that. So I have two simple questions, (assuming that my guess to the first question is correct). A: do you have the radio coax connected to a 50 ohm dummy load? If you said that in the video, I didn't hear it. And B: what did you press and hold to get into the service mode of the radio? It just occurred to me that you may have noted that info in the details "below", so I'll check that ASAP. If you haven't I hope you could take a moment to answer those questions. Thanks for the video and everything you recorded on camera was crystal clear, (I mean, I could see exactly what connections you made). Rich
Mark, thank you a lot for sharing the video. Where is the manufacturer (Qixiang Electron makes the board) information, that 20 mA is used for I Q3?. Is somewhere a alignment manual or schematic available?
So, fellow technicians and wanna-be technicians, what did we learn here today?.....That's right, the factory had already set the Bias properly and nothing was needed to further enhance the already properly working Stryker ver 2. ......in short, we learned to Keep your damn fingers out of a good radio because all your going to do is fk it up!
What final output transistors does the V2 use? I'm wanting to upgrade the 13N10s in my V1 955 but am still not sure what all is required. From some research I have found that folks are putting IRF520N's in place of the 13N10's.
@@Mark19960 Ok thanks! Ill leave them be for now. What about the obsolete TDA2003V IC? Its the last transistor before the speaker. I have a bad one can you recommend a replacement?
Yeah, you need to have a lab supply now. The procedure was changed to make it safer for the radio. The version 1 radios ran a risk of turning the mosfets on hard and letting out the magic smoke. by having a 10 volt source and a ballast resistor in place that risk is pretty much gone. One thing that has been seemingly impossible to get some people to understand is that there never was a "magic voltage" used to set bias. You can change the outputs, but keep this in mind.... It does very little to change the driver and final. The gains are had by changing the 2 mosfets in the PA section. That's the two closest to the antenna jack. I can't show you the schematics and explain why that is but simply put, the final is padded going into the PA stage... so there is little benefit to changing all 4 devices.
@@Mark19960 if I do decide to change to something like, ERF2030+ mosfets, for the fun and the learning experience, would you still set the bias using the values in the video? Or does the bias change based on the components own requires values?
@@mcconja good question. I would have to try to put ERF2030s in there. They are not much different from Z24s. the same procedure works for Z24s so i don't see any issue with 2030s - which are just sketchy relabeled parts.
Didn't see that mate. I don't really dabble in the messenger thing. It's sort of there.... I don't make those things anymore. It's sort of a time issue... I don't really have much these days. I try to pick it up but then I get swallowed down another more important rabbit hole.
Yes but wait! Are you saying that by turning the channel selector, you're actually making the adjustment? I must guess that you are saying that.
So I have two simple questions, (assuming that my guess to the first question is correct). A: do you have the radio coax connected to a 50 ohm dummy load? If you said that in the video, I didn't hear it. And B: what did you press and hold to get into the service mode of the radio?
It just occurred to me that you may have noted that info in the details "below", so I'll check that ASAP. If you haven't I hope you could take a moment to answer those questions.
Thanks for the video and everything you recorded on camera was crystal clear, (I mean, I could see exactly what connections you made).
Rich
Very nice demonstration Mark! 73
Nice job learned a lot keep up great work
Mark, thank you a lot for sharing the video. Where is the manufacturer (Qixiang Electron makes the board) information, that 20 mA is used for I Q3?. Is somewhere a alignment manual or schematic available?
That stuff isn't available unfortunately. I drew my own schematics of the radio and I wrote an alignment procedure.
So, fellow technicians and wanna-be technicians, what did we learn here today?.....That's right, the factory had already set the Bias properly and nothing was needed to further enhance the already properly working Stryker ver 2. ......in short, we learned to Keep your damn fingers out of a good radio because all your going to do is fk it up!
i havent seen one that required a change. Now if you change the transistors then yeah, you have to redo it.
Otherwise yeah leave it alone.
Thanks for sharing this with us
Do you happen to have any information or a video on adjusting the 980's pots? Thanks.
On that one, no.. but I think Mike has one. look for mikes radio repair. I will be willing to bet he has covered this.
@@Mark19960 Is Mike still working Radios?
He hasn't posted new videos in a while.
How do you like the V2?
@@RC-Heli835 I use one in the car for a daily driver. Prefer it over the version 1.
@@Mark19960 10 4
Roger that! My 955 v1 is my favorite of all radios. I have not tried the v2 yet.
What final output transistors does the V2 use?
I'm wanting to upgrade the 13N10s in my V1 955 but am still not sure what all is required.
From some research I have found that folks are putting IRF520N's in place of the 13N10's.
They use IRF520s.
If you have a 955 with 13N10s, it's an old radio. I think it needs a few other parts changed to work with 520s.
@@Mark19960 Ok thanks! Ill leave them be for now.
What about the obsolete TDA2003V IC?
Its the last transistor before the speaker. I have a bad one can you recommend a replacement?
Thinking about changing finals in mine. I don’t have a 10v source. 🤔
Yeah, you need to have a lab supply now.
The procedure was changed to make it safer for the radio. The version 1 radios ran a risk of turning the mosfets on hard and letting out the magic smoke. by having a 10 volt source and a ballast resistor in place that risk is pretty much gone.
One thing that has been seemingly impossible to get some people to understand is that there never was a "magic voltage" used to set bias.
You can change the outputs, but keep this in mind....
It does very little to change the driver and final. The gains are had by changing the 2 mosfets in the PA section. That's the two closest to the antenna jack. I can't show you the schematics and explain why that is but simply put, the final is padded going into the PA stage... so there is little benefit to changing all 4 devices.
@@Mark19960 thank you!
@@Mark19960 if I do decide to change to something like, ERF2030+ mosfets, for the fun and the learning experience, would you still set the bias using the values in the video? Or does the bias change based on the components own requires values?
@@Mark19960 ordered a supply. 😄
@@mcconja good question. I would have to try to put ERF2030s in there. They are not much different from Z24s. the same procedure works for Z24s so i don't see any issue with 2030s - which are just sketchy relabeled parts.
The service manual doesn’t say add 20….
There are a lot of things the manual doesnt say, or says incorrectly. I could made a video on the mistakes in it.
Well I’ll wait for the new manual with this version of current adjustment. Is this verified by Stryker?
MARK tried to contact you on facebook about channel king board shoot me an email if you would please.
Didn't see that mate. I don't really dabble in the messenger thing. It's sort of there....
I don't make those things anymore. It's sort of a time issue... I don't really have much these days.
I try to pick it up but then I get swallowed down another more important rabbit hole.
@@Mark19960 bummer there are sure a lot of folks wanting them!