CRT SS 7900V Turbo (latest version) Service Mode? (And more tricks)...

[Eldorado828]

Based on what you have said, I would strongly suggest that you do not mess with any adjustments in this radio.

The question is always: what power meter are you using, and what is your test setup?

(If I had to guess, I would say your radio is fine, and your power meter is not a real PEP meter (which is why you are not seeing the power you expect). This is almost always the case here. But maybe I shouldn't assume. ; )

Either way, you should stay out of that service menu unless you have access to proper test equipment. Otherwise this usually ends badly. (If you don't believe me, have a search and you will see how many people thought they knew better, and then had to ask for help (or send the radio off for repair) because they messed up their alignment settings and then couldn't get them back to how they were)...

Sing it!

 

[columbas]

I am using a Dosy TC-4001 meter On the Dosy meter showing 35 to 40 on am/fm/ssb PEP on THE RADIO METER AM =70 FM =50 SSB = 40 to 45 I plan on getting a signal generator. By the way Thank you for the help and advice.

 

[columbas]

I forgot to say I am also using a 50 ohm dummy load at the meter

 

[Pez]

I am using a Dosy TC-4001 meter On the Dosy meter showing 35 to 40 on am/fm/ssb PEP on THE RADIO METER AM =70 FM =50 SSB = 40 to 45 I plan on getting a signal generator. By the way Thank you for the help and advice.

If you are worried about power, the best thing you could do is get yourself a decent peak reading power meter. I can recommend this one (high accuracy, good price): https://www.dxengineering.com/parts/mtn-swrmeter

I have a coupe of these. They compare favourably to an LP-100A and Bird43 with peak kit.

Scotts Radios on YouTube did a good reviews on the Monitor Sensors meter recently.

The DOSY is not accurate for PEP tests.

 

[BC Coyote]

My radio from factory is showing 35 to 40 watts out with an external meter. Not the 60 that people are saying

The difference between 40 watts and 60 on the receive end is so tiny as to not even be detectable ! You need to quadruple power to get a 1 S unit increase on receive, so in this case to get the 1 S unit you would need to go from 40 to 160 watts. So you can see that going from 40 to 60 is insignificant !

People put WAY to much emphasis on getting out every single watt of power, when making improvements to the antenna system will make a MUCH bigger improvement every time.............

 

[AudioShockwav]

I don't know about the 5555, but the 6666 and 9900 have a 10% duty cycle.
They are not brick on the key radios, mine tends to run very warm on FM at full tilt.
The "best" option is to reduce the power of the radio and use a small amp to increase duty cycle.

73
Jeff

 

[BC Coyote]

reduce the power of the radio and use a small amp to increase duty cycle.

That's how I run my 5555N2 in all modes. On FM the radio is putting out about 3 watts so stays nice and cool. The Palomar 200 does the heavy lifting and since I added a nice quiet fan to it, it stays nice and cool too ! The amp is class A/B biased and I get about 150 out on FM.

 

[Keto]

If you are worried about power, the best thing you could do is get yourself a decent peak reading power meter. I can recommend this one (high accuracy, good price): https://www.dxengineering.com/parts/mtn-swrmeter

I have a coupe of these. They compare favourably to an LP-100A and Bird43 with peak kit.

Scotts Radios on YouTube did a good reviews on the Monitor Sensors meter recently.

The DOSY is not accurate for PEP tests.

Is that Monitor Sensors meter going to be very difficult for somebody to see that uses reading glasses when close up?
Looks like a nice little unit for the money.

 

[Pez]

Is that Monitor Sensors meter going to be very difficult for somebody to see that uses reading glasses when close up?
Looks like a nice little unit for the money.

I don't wear glasses, so I have no idea! I would guess that reading this would be easier than seeing a cross-needle or a 43 meter. Also, the LCD color will change with SWR (progressively from blue to red as SWR increases), so you also get that as a visual representation without even needing to read the displayed values for SWR.

73

 

[Keto]

I don't wear glasses, so I have no idea! I would guess that reading this would be easier than seeing a cross-needle or a 43 meter. Also, the LCD color will change with SWR (progressively from blue to red as SWR increases), so you also get that as a visual representation without even needing to read the displayed values for SWR.

73

All right I appreciate the info and you're doing good if you don't have to wear reading glasses yet.
Edit: the meters look nice I'm thinking about trying one of them

 

[_johnyD]

Hello.

Comparing service menu settings in my AT5555n II with those shared in the Excellsheet at page 4
( https://www.worldwidedx.com/threads...rvice-mode-and-more-tricks.264877/post-826044 )

I can notice quite huge differences for some item. The FW version for my radio is the next one though, the 101. I'm wondering if something's 'screwed up' in my radio or if that's cause of the different FW version.

I notice different values for:
11 FMMOD (00250 vs 01330)
14 CTC (00052 vs 00576)
15 DCS (00042 vs 00518)
24 USB PA (5-13 vs 140)
25 LSB Pa (5-13 vs 140)
and maybe
34 UL SQL (117-162 vs 241)


Wondering if anyone can share v101 settings for a comparison, that would be a great help.

 

[Shadetree Mechanic]

Hello.

Comparing service menu settings in my AT5555n II with those shared in the Excellsheet at page 4
( https://www.worldwidedx.com/threads...rvice-mode-and-more-tricks.264877/post-826044 )

I can notice quite huge differences for some item. The FW version for my radio is the next one though, the 101. I'm wondering if something's 'screwed up' in my radio or if that's cause of the different FW version.

I notice different values for:
11 FMMOD (00250 vs 01330)
14 CTC (00052 vs 00576)
15 DCS (00042 vs 00518)
24 USB PA (5-13 vs 140)
25 LSB Pa (5-13 vs 140)
and maybe
34 UL SQL (117-162 vs 241)


Wondering if anyone can share v101 settings for a comparison, that would be a great help.

What is wrong with your radio, are you having a problem with it?

 

[_johnyD]

What is wrong with your radio, are you having a problem with it?

I'd been fiddling in the menu in a moment when I'd be better being sleeping instead. And I noted down the only settings I was about to try and mod (22 and 23)
Not even sure if I changed anything, but had a feeling like ptt released for a lapse while turning the knob.
I thought better trying to verify before using the radio

 

[Shadetree Mechanic]

Oh dear, good luck. The setting in the radio are custom for the radio, other radio settings in your radio might be close. Might not be. Some settings can only be derived with test equipment supplying a signal to the radio. The value of the signal becomes set for that parameter. If you lost one of those settings, you will have to send it to someone who has the equipment to put it back. I would try the radio and cross your fingers.

 

[_johnyD]

Yep, I'll do radio checks asap.
I'm mainly concerned with those USB PA and LSB PA, even though it's not so likely the same value had been set for both by mistake. Have got no idea about the function of those.
Also concerned about FMMOD, but this would be easy to check in use, probably.
No way to check CTC and DCS instead, for me at now.