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Zetagi B550P Vs RM KL500
Topic Started: Sunday, 6. February 2011, 13:24 (14,333 Views)
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Zetagi themselves list the B550P as 20 - 30Mhz, I guess the transistors are SD1446 type pills as fitted to the later KL500, in that case they are HF transistors designed to work at HF frequencies.

What I can tell you about the KL500, which will apply to the Zetagi, it will not do the quoted 600W SSB, and at 10m it will produce less power than it does at lower frequencies. It will probably be good for about 300W plus dependent on what transistors are fitted, the original MRF455 were rated at 60W so multiply that by four, the later SD1446 transitors are rated at 100W output for 6W drive

Just why is it a splatter box? simply put it's because it doesn't have a filtered output so it's 2nd and 3rd harmonics etc are not surpressed, a local chap uses a KL500 mobile on 20m, I can hear him on 10m when he's close by.

Using your's in the car Dave is the ideal situation, you obviously have much better for the house, and it won't upset the neighbours when you use it :D

I own a KL500, but haven't yet modified it.
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Yes I understand about the filtering ,I did have a RM HF amp................the big silver monster with three fans on top and sold it like a "Numpty" a couple of years ago without even using it.
It had switchable band past filters built in it.That would be my choice but £440 new........not going to happen.
To be fair I can fabricate a stainless double fan shroud unit at work for not much Pennys (I.e None!!) .I also have a nice pair of German (I think) Papst blower fans that Linear Amp UK use to cool it down kicking about doing nothing Mate.
It goes with out saying I trust the Ham amp power claims.........but anything made in Italy aimed at the CB Market,I believe as much as Alan Carr is going to be the next "Mad Max" ;)
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And remember if it is a hans anytone to watch the power. Hans tells one and all, 6w input on SSB only and ignore the described amount in the manual of the RM KL500. I have a hans one, takes over 45amps of juice with 4w input and is a little dirty as mentioned before. But ace for the car thats sure.
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Mark in Essex
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26 Charlie Tango 037

My turn :D ....have used RM and Zetagi amps of various different sizes over the years at home, mobile etc...have trimmed down my linear collection now. RM KL500 X 2 both sold, RM KL200 x 3 all sold..EA-150 sold (eh Dave ;) ).... Linears i use now are Zetagi B550P...Zetagi B300P...Zetagi B150....

RM watts have me broadcasting over most electrical items in the house :( ...Zetagi watts don't :)

Has nothing to do with it (or has it) but Zetagi linears are heavy...heavy is good ;) a sign of reliability (in my book...lol)

RM have the weight of a cheap Mills and Boon Romance novel....lol


Nothing scientific there...just my ramblings and findings.......oh and FANS ....a must on all linears ;) ..but you know that Dave ;)


That's all from me folks :cheers:
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MadMark1
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163 Charlie Tango 020
the b550 uses/d four MRF455 (60 watt) four of them, where as the KL500 uses the sd1446 (100 watts ) four of them as Northern35 has said, maths is easy, 4 times 60 is 240, 4 times 100 is 400. obviously this is peak power and the transistors are run at full output, in the interests of spectral purity a lowpass filter ( one for each band is best ) should be used . also care should be taken in NOT over driving these amps.

but then again most off us already know this stuff about over driving and lowpass filters ? dont we ....

Mark
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VoG
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madmark1
Monday, 7. February 2011, 07:03
but then again most off us already know this stuff about over driving and lowpass filters ? dont we ....
Apologies for a slightly off-topic comment..... But valid here.

MadMark: The Royal "WE" here (certainly yourself, Oggy, Northern35s, Mark in Essex, Simon, and maybe even me) should indeed know about over-driving and low-pass. But don't forget that the CT Boards now get over 30,000 hits per month, I think we can guarantee that the Forum may be read by people that DON'T know this stuff.

So it IS always worth an explanation, such as you've given.
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Mark in Essex
Monday, 7. February 2011, 04:01
My turn :D ....have used RM and Zetagi amps of various different sizes over the years at home, mobile etc...have trimmed down my linear collection now. RM KL500 X 2 both sold, RM KL200 x 3 all sold..EA-150 sold (eh Dave ;) ).... Linears i use now are Zetagi B550P...Zetagi B300P...Zetagi B150....

RM watts have me broadcasting over most electrical items in the house :( ...Zetagi watts don't :)

Has nothing to do with it (or has it) but Zetagi linears are heavy...heavy is good ;) a sign of reliability (in my book...lol)

RM have the weight of a cheap Mills and Boon Romance novel....lol


Nothing scientific there...just my ramblings and findings.......oh and FANS ....a must on all linears ;) ..but you know that Dave ;)


That's all from me folks :cheers:
Thanks for your advice Mark........EA150 mmmmm seen that somewhere before ;)
I'll be buying a new large one very soon .
The 550P Zetagis seem hard to find new (unlike the 300P)
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Mark in Essex
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26 Charlie Tango 037

No worries Dave..should have also said ...The reason the KL500's was ditched from mobile use was anything over 150 watts played havoc with the auto electrics in both the Mercedes (R.I.P.now somewhere in Africa being used as a cab lol) and the Mitsubishi Truck.....The Zetagi's i could run flat out and not a problem :cheers:
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MadMark1
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163 Charlie Tango 020
A lowpass filter circuit diagram and a output sensor used for power measurements or TX shut down etc.. could be used with the KL500 or any other amp if beafed up a bit.

http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=17766

Mark

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Is it worth buying a 24Volt RM 500 as it only needs half the amps to drive it ( 18ish by my calculations). But can you buy a unit to convert your 12Volt DC PSU to 24Volts like an inverter or a step up transformer.If so from where and at what sort of cost.Or is it a waste of time?
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ChrisC
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26 Charlie Tango 437

totally totally not worth it. a step up from a 12v psu that does enough power will cost loads.
If you're going to run it off of batts then two batts will do it just fine :)
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So two truck batterys with trickle charge then I guess.Is this better than 12 Volts for any reason (last longer?)
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ChrisC
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26 Charlie Tango 437

Erm no they wont last longer as you are still drawing X Amp hours.
20Amps at 12v or 10Amps at 24 volts will still see the same drain. The one advantage of being at 24v is the slightly lower cable losses due to the higher voltgage.

You'd need a truck battery trickle charger for 2x12v batts showing 24v or charge them both seperate.
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ChrisC
Thursday, 10. February 2011, 23:09
Erm no they wont last longer as you are still drawing X Amp hours.
20Amps at 12v or 10Amps at 24 volts will still see the same drain. The one advantage of being at 24v is the slightly lower cable losses due to the higher voltgage.

You'd need a truck battery trickle charger for 2x12v batts showing 24v or charge them both seperate.
So other than cable loss and having twice the batterys of coarse I understand that it draws X amps per hour regardless ..........I'm just sussing out the best option for me
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ChrisC
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26 Charlie Tango 437

All depends on cost. if it costs a lot less to get the 24v version and the battery is cheap (which it should be) then you can easilly save a fair wedge of cash.
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I think new there similar money...........or I could buy a Volvo F10 to put it in.......now thats an idea
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MadMark1
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163 Charlie Tango 020
Also RF transitors that run on higher collector voltages are generally more cleaner 'RF' wise than transistors that use the normal 13.8 volts .. also less amps are needed to run it, so your batteries last longer when out mobile, so yes its worth it, two decent car batteries will do the job of powering it..


Mark
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madmark1
Thursday, 10. February 2011, 23:36
Also RF transitors that run on higher collector voltages are generally more cleaner 'RF' wise than transistors that use the normal 13.8 volts .. also less amps are needed to run it, so your batteries last longer when out mobile, so yes its worth it, two decent car batteries will do the job of powering it..


Mark
Thanks Mark........I thought as much, just pondering on the best way forward , for some decent clean power.....cheers all advice welcome ;)
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ChrisC
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26 Charlie Tango 437

madmark1
Thursday, 10. February 2011, 23:36
Also RF transitors that run on higher collector voltages are generally more cleaner 'RF' wise than transistors that use the normal 13.8 volts .. also less amps are needed to run it, so your batteries last longer when out mobile, so yes its worth it, two decent car batteries will do the job of powering it..


Mark
I can't comment about the first bit but the second bit is wrong.

If you've got a 100% efficient amp running 500w at 12v it'll draw 41 amps, if you've got it running at 24v it'll draw 20.5 amps.

Two batteries running at either 12v or 24v will last the same length of time as they will both be 12v "xxAH" batts.
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ChrisC
Thursday, 10. February 2011, 23:54
madmark1
Thursday, 10. February 2011, 23:36
Also RF transitors that run on higher collector voltages are generally more cleaner 'RF' wise than transistors that use the normal 13.8 volts .. also less amps are needed to run it, so your batteries last longer when out mobile, so yes its worth it, two decent car batteries will do the job of powering it..


Mark
I can't comment about the first bit but the second bit is wrong.

If you've got a 100% efficient amp running 500w at 12v it'll draw 41 amps, if you've got it running at 24v it'll draw 20.5 amps.

Two batteries running at either 12v or 24v will last the same length of time as they will both be 12v "xxAH" batts.
Yes you have the same current been used in an hour..............but surely you have two batterys instead of just one like having two 1 litre bottles of Coke instead of 1 bottle (double the energy stored).......or am I loosing the plot :(
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