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 KL203 in black - SSB power rating?

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PostSubject: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Jul 03, 2020 11:11 pm

Hi All,

I just received an RM KL203, new.

When looking at the sparse info leaflet that comes with it, it specifies that max input is 10W.
Output max is 100W.

All good.  

However, despite mentioning SSB as one of it's operating modes, there is no separate info given on the instructions for SSB.

People say online that input (max) for AM/FM is 10W but input for SSB can be up to 20W.
Different versions of the leaflet that I see online also say so.

Also, the heatsink on my 203 is black. Most others I have seen (bar one new YT video) are blue.

Does anyone know if this is a new or older model, and if so, would the 20W input / 200W output still stand for SSB?

cheers   Doc

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Jul 04, 2020 12:10 am

Thanks Nubster.

You have the original President Lincoln...!

Is that the one with the NASA / Apollo 11 type roger beep Very Happy

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Jul 04, 2020 11:29 pm

Silly question, but never thought about this before....

The correct order of things would be: transceiver, followed by KL203, followed by Zetagi matcher / power SWR meter.........
Correct?

Thank you all cheers

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSun Jul 05, 2020 5:09 am

The Doctor wrote:
Hi All,

I just received an RM KL203, new.

When looking at the sparse info leaflet that comes with it, it specifies that max input is 10W.
Output max is 100W.

All good.  

However, despite mentioning SSB as one of it's operating modes, there is no separate info given on the instructions for SSB.

People say online that input (max) for AM/FM is 10W but input for SSB can be up to 20W.
Different versions of the leaflet that I see online also say so.

Also, the heatsink on my 203 is black. Most others I have seen (bar one new YT video) are blue.

Does anyone know if this is a new or older model, and if so, would the 20W input / 200W output still stand for SSB?

cheers   Doc

I have the same amp (mine is blue). The maximum inputs are 0.5-10 watts in FM/AM mode and 1-20 watts in SSB mode. I've never seen a black one and there are none on their website. There are a couple of black ones for UHF and "Ham" use though.

https://www.rmitaly.com/product-category/linear-amplifiers/25-30mhz/page/1/

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSun Jul 05, 2020 7:00 am

They are all the same. just different batches. 

RM KL203 is without the pre-amp and with 10w in on FM it will give you 100w output but most people put only around 6w into it for around 60w out on FM

On SSB 20w in will give you 200w PEP output. I have had a few of these and never had a problem with them. On SSB id always put the full 20w into it because remember it wont actually be a constant 20w as the power fluctuates with your modulation so its hard to stress the amp and it works perfectly well.

Make sure your PSU has enough amps because if not it wil make your audio terrible. When using amps with radios i suggest you buy a 30a power supply and you can 100% be sure that you radio and amp are getting enough juice.

SWR must be on point too when using amps. if you SWR is high, that amount of reflected power will be amplified by about 10 times and you dont want that because your radio will become a melted heap.

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSun Jul 05, 2020 7:08 am

I have a black one too, If I drive with more than 8 watts a/fm you could cook eggs on the heat sink. and ssb I never drive with more than 6 watts...Any more and it starts to buzz and hum, if I drop below 4 watts I get relay clatter, it heats up so much I had to fit a fan. I got so fed up with it I bought a Yaesu,,,,,,,,,,,,,,,, what a difference, propa job, no 1/2 mile of cables hanging out the back no little black boxes all over the place,, just plug in and play, should have bought one years ago
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSun Jul 05, 2020 11:23 am

Thank you all for your replies. Extremely helpful as always!
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSun Jul 05, 2020 12:59 pm

Just bought one of these and mine is black as well. 10w am/fm 20w ssb.

Paul.
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Aug 15, 2020 5:13 pm

Will these work off 600 watt pc psu at 12 volts ?  What a Face

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Aug 15, 2020 6:18 pm

Hi Leonard,

It has been done.....

Mower Junkie PC PSU for CB


Think he's using bigger than 600W though. (Your power supply should show the current for each voltage somewhere, I have a feeling you have a 600W in total unit)

I'm all for playing with and repurposing electronic items but I stuck with a purchased unit designed for the job. PC power supplies can be notoriously RF noisy and the ratings are normally absolute maximum not a 'comfortable' rating.

That said, people obviously do it, just I wouldn't personally trust it.


All the best,
Victor

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KL203 in black - SSB power rating? Empty
PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeWed Aug 26, 2020 8:14 pm

Sgt Bilko wrote:
Just bought one of these and mine is black as well. 10w am/fm 20w ssb.

Paul.
Hi Paul just wonder how you are getting on with the black coloured kl203p ? You had a chance to do any power input / output power checks on it ?
I thought they were just the same amp as the older blue or red coloured versions but notice on Simon the wizard website it states it’s a new spec version.
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Aug 28, 2020 12:08 pm

The " KL RM 203 Black Amp " i got is doing what it says on the box 10w /100w FM and 20w / 200w SSB.

But that was just testing. On my home base @5w my meter is reading 60w ( new zetagi HP 203W ).

When i had the 7900 i ran it @8w which was giving me 85w out. But i only run the amp for DX.

Paul.
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Aug 28, 2020 1:14 pm

Great stuff thanks for that.
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Aug 28, 2020 1:45 pm

Hi ,Sgt Bilko ,,, are you powering the radio and amp on the same power supply ,, Will a 30 amp work with both ?
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Aug 29, 2020 7:39 pm

Hi Leonard. Yes both from my 50a PSU but a 30a will do fine.
Even running the radio at 10w with the amp doing 100w, the PSU will be fine.

Paul.

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeSat Aug 29, 2020 7:43 pm

Hi Paul, Leonard,

Sorry to Jump in but I have to say Paul, Loving your new Avatar - Brilliant !!!

Brought a smile to my face is all I can say Very Happy Very Happy .

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Oct 23, 2020 8:19 pm

hi, i have the RM KL 203P in blue, 100 FM 200SSB, i have run this on a 20amp power supply no problem's, at 13.8volt's, i up graded my linear to a RM KL 400,  200 FM and 400SSB, it draws about 35amp's, and some times pushes my voltage to 17 volt's, depending and the strain, here's my new linear pic, KL203 in black - SSB power rating? 20201014
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeFri Oct 23, 2020 8:31 pm

to give you a comparison check on the size of the 2x linear's and the power supply needed to run the 
RM KL-400 check photo's,KL203 in black - SSB power rating? 20201016
KL203 in black - SSB power rating? 20201017
KL203 in black - SSB power rating? 20201015
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeWed Oct 18, 2023 12:41 am

The Doctor wrote:
Silly question, but never thought about this before....

The correct order of things would be:  transceiver, followed by KL203, followed by Zetagi matcher / power SWR meter.........
Correct?

Thank you all cheers
I would like to clarifie. On this question.

The correct order ONLY to test linear output power is 
Transiever followed by kl203 followed by swr matcher power meter. Then antenna.

The correct order to test swr or use the matcher is.
Tranciever followed by swr /matcher power meter followed by kl203 then antenna. 

I hope that helps someone. 
73s 26 GL79.
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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeWed Oct 18, 2023 9:53 am

26GL79 wrote:
The Doctor wrote:
Silly question, but never thought about this before....

The correct order of things would be:  transceiver, followed by KL203, followed by Zetagi matcher / power SWR meter.........
Correct?

Thank you all cheers
I would like to clarifie. On this question.

The correct order ONLY to test linear output power is 
Transiever followed by kl203 followed by swr matcher power meter. Then antenna.

The correct order to test swr or use the matcher is.
Tranciever followed by swr /matcher power meter followed by kl203 then antenna. 

I hope that helps someone. 
73s 26 GL79.

Incorrect. The proper way to test output power is radio, amp, meter then dummy load. Without the dummy load any readings will be inaccurate.

If you're using a matcher then that goes last, before the aerial if it's needed, the load needs to be matched for the burner output else damage may occur.

As for output power, the last thing you want is to over drive the amp to keep distortion and harmonics (nasties) to a minimum, SSB audio will sound bad if it's not truly linear too (most amps aren't). Amps have their uses but don't believe the hype, most ratings are very optimistic, I wouldn't put more than 4/5W in on am/fm or 10/12W in on ssb personally, keeps it safe.

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PostSubject: Re: KL203 in black - SSB power rating?   KL203 in black - SSB power rating? Icon_minitimeMon Oct 23, 2023 3:46 pm

i run mine black kicker at 4w am and fm and ssb 10w only and a fan keeps it cool

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