Stryker SR-955 quick tune question

[Greg T]

Trying to lower the AM low power setting. I have the high power set up properly, but the lower power pot... is that the w10 ANL pot? That just seems like a mod limiter to me. I want a no-mod dead carrier down to about 2 watts. anyone know which pot? TIA

 

[Greg T]

No one else knows, either?

 

[Riverman]

Greg,
Check out this thread. Particularly Post #3 by Shadetree.
https://www.worldwidedx.com/threads/stryker-955-amp.232782/

 

[Greg T]

Greg,
Check out this thread. Particularly Post #3 by Shadetree.
https://www.worldwidedx.com/threads/stryker-955-amp.232782/

I can regulate the pep by using the AM ANL pot. That works great and adjusts the amount of swing. I just need to lower the dead key without losing the high power setting. There is a W1 pot that says PWRL, but it is not referenced in the alignment procedure. I was just wondering if this is just the dead key.

 

[Riverman]

I can regulate the pep by using the AM ANL pot. That works great and adjusts the amount of swing. I just need to lower the dead key without losing the high power setting. There is a W1 pot that says PWRL, but it is not referenced in the alignment procedure. I was just wondering if this is just the dead key.

Gotcha.
I’m not sure about the pot. Someone should be. Good luck!

 

[Shadetree Mechanic]

Not sure about the pot either, but I the power knob on the front of the radio should turn down the carrier. At least that's the way it works on mine. The peak remains the same, I don't know if mine has been modified though.

 

[Handy Andy]

Last I knew,

RF Power knob (front panel) all the way to MAX (HI)
W15 is FM High power,
W11 is AM High Power

You set both
- but FM is ~40 W (At least I'd keep it there)
- and AM is ~15W (no more than that)
- V10 sets "limiter action"

Else if this doesn't "line up" with what you got, might need a pic so us kids can help...

 

[Greg T]

I found the info on this site on a 655, which I believe is pretty much the same radio, minus the SSB. I really don't want to mess with the peak unless to turn it down, so I believe the ANL will remain the same. I don't need any more than 15W dead key and will most likely never run it that high. I'm not one of those "bottom of the page" cam guys when building a motor. BUT, I have seen videos of people showing a 2W carrier and 50W pep radio, and others showing a 5W carrier with a 35W pep. My goal is to have about a 2W carrier and 40W pep max on the low end. I'll run this radio in the same manner as I run my Yaesu. Let the radio idle while it feeds the amp and let the amp do the work.

Back to the 655 settings; I've seen other publications mentioning V10 as low power. The schematics I've seen do not show a V10, but rather a W1. Could be a newer/older silk screening I would guess. But the instructions in the 655 publication state the W1 is the AM low power. The last 955 board I viewed looked exactly like it. I'm attaching an image of the 9555 layout that shows the W1 pot.

 

[Handy Andy]

Yeah, that's what I have too - but does it look like your board?

​

The chassis is a lot like Galaxy's DX series, the Q56 that people often get confused with, - the Envelope Controller uses W11 for SSB while W14 is for the "FM" side of it - which tracks the carrier signal "level"

​

W1 is the "dead nuts" control -your Base. Your starting "bias" so if you set this too low, any tune up done after setting it wrong - it won't work very well.

 

[Greg T]

Yeah, that's what I have too - but does it look like your board?

View attachment 56776​

The chassis is a lot like Galaxy's DX series, the Q56 that people often get confused with, - the Envelope Controller uses W11 for SSB while W14 is for the "FM" side of it - which tracks the carrier signal "level"

View attachment 56777​

W1 is the "dead nuts" control -your Base. Your starting "bias" so if you set this too low, any tune up done after setting it wrong - it won't work very well.

The image I attached was for the 955 from my archives. I realize the fact that I am no tech, never claimed to be and never will be. Too damned old to learn all that!! LOL. But, I'm not going in there blindly to start turning stuff. The info I have on the 955 is as follows:

W6 SSB ANL
W10 AM ANL
W11 AM Hi Power
W13 SSB Limit ( not sure what this does)
W14 FM Hi Power
W501 AM Mod

W1 Says PWRL ( I assume, low power AM?)

I understand that the ANL, coupled with a carrier adjustment is similar to the old Yaesu FT-757GX where they have a drive control, and the modulation percentage on the back. You adjust the low carrier first, and then use the drive to get the forward swing. The 955 looks very similar. Basically, I'm not going to screw with a thing until I know for certain what is what. I'll do the conversion, set the hi power, drop low SSB to 40 pep and leave it.

 

[Handy Andy]

You adjust the low carrier first, and then use the drive to get the forward swing. The 955 looks very similar.

You're good to go,

IF you have issues let us know, but the radio is pretty much straightforward, set low, then set hi and ALC and AMC fall in between.

Just remember to keep an eye on the RF Power control...

The PEP part, is where people get goofed up - when you set AM LOW - that W1 is BASE for EVERYTHING - FM/SSB/AM CW.

The PEP/ALC/AVC and AMC issues come up when the W1 is set too low, and you can't get the swing dynamics low (narrowed down) enough so you don't or can't keep the pills in the amp from popping.

 

[Greg T]

You're good to go,

IF issues let us know, but the radio is pretty much straightforward, set low, then set hi and ALC and AMC fall in between.

The PEP part, is where people get goofed up - when you set AM LOW - that W1 is BASE for EVERYTHING - FM/SSB/AM CW.

The PEP/ALC/AVC and AMC issues come up when the W1 is set too low, and you can't get the swing dynamics low (narrowed down) enough so you don't or can't keep the pills in the amp from popping.

IF I happen to get one of those rigs where the low AM carrier is above 3W ( It's been known to happen) I want to just knock it down to about 2W. That's the only reason I would need to touch it. My main goal is to crank the RF power knob fully CCW, and have 40W pep max on both SSB and AM. Then, let the amp do the work.

Thanx for the info, H.A. I'll give a report how she works out when I get it done.

P.S. Do you know anything about the power output meter on these? Notoriously out of whack. Can't seem to locate the proper adjustment for that, either.

 

[Handy Andy]

I'll check - no guarantees, but it's on the front panel CPU board...

 

[Handy Andy]

OOPS - It not!

It's W4 for RX S-Meter adj side...AM and FM
W5? That is RX for SSB S-Meter adj...
Right by "Network" coils on main PCB..."behind" the shield towards the front - of the RFI shield mid-section.

For some ungodly reason, the TX side is CPU controlled.

But uses ANL and ALC/AMC controls to limit it on the main PCB.

 

[Handy Andy]

From the "alignment" section of the CBT stuff I have - it tells you the "expected" RF peaks are at the supply rail (13V) if that means it's MENU Selectable - I haven't played with one to VERIFY that is the way to "adjust RF meter" using CPU display.