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| Zetagi B550P Vs RM KL500 | |
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| Tweet Topic Started: Sunday, 6. February 2011, 13:24 (14,332 Views) | |
| MadMark1 | Friday, 11. February 2011, 00:15 Post #41 |
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According to RM the KL500/24 has a maximum current drain of 16 amps, so to be realistic i would run it from at least a 20 amp supply, now the 12 volt version uses about 40 amps to run to full power. lets say you have a 50 amp battery at 12 volts, now drawing 40 amps from it when powering the KL500 it aint going to last long, now if you have two of these batteries in series you have double the voltage but the same current available. so it stands to reason that if your only drawing a maximum of 20 amps from a 50 amp battery it would last longer. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Friday, 11. February 2011, 00:24 Post #42 |
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Again cheers Mark, much the same as I said..............but I used Coke as a reference, only because I was drinking a glass!!
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| ChrisC | Friday, 11. February 2011, 00:24 Post #43 |
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I think there is some confusion. 2 x 12v batts 50amp hours each = 1 x 24v @ 50 amp hour or 1 x 12v at 100 amp hour. If the current drain at 24v is roughly double you wont gain anything. You dont get to double both figures, only one. Just adding.. I'm talking purely about LARGE CAR BATTERIES, 12v/13.8v jobbies. Otherwise you're not mixing apples with apples. 2 x 12v 50amp batts vs 2 x 24v 50 amp batts are completely different beasts and the 24v batts will be much bigger Edited by ChrisC, Friday, 11. February 2011, 00:27.
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| MadMark1 | Friday, 11. February 2011, 00:27 Post #44 |
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A snip from QRZ.COM forums. W9GB02-28-2009, 12:33 AM Just a question, are the CCI Application Notes notes based on K7ES' designs? Yes. Helge authored most of the Motorola Application Notes (he worked for Motorola) and CCI really exists in part to continue the support for his work, now that he is no longer with us. ![]() Helge also served as a technical advisor to ARRL. The ARRL Handbooks in early 1980s had a shortened version of AN-762. Page 6-41 in my 1982 ARRL Handbook. Figure 65 (page 6-43) of that same Handbook shows a nice 7-pole Chebyshev low-pass filter design with notes by Ed Wetherhold, W3NQN. In retrospect, it does seem as if though the hassle to benefit ratio is too big with the KL500. I was thinking of doing exactly what you said, use it for parts. Yes, look at the MFJ/Ameritron ALS-600 and ALS-500 ... that is what the RM KL-500 should be -- but they cannot build the same for less than Ameritron. While the ALS-500 is a mobile unit (using 12 V RF transistors), the ALS-600 uses 48 Volt MOSFET devices. The ALS-600 does not have an automatic antenna tuner -- which is another feature that adds to COST ! Once you go beyond 2 bipolar transistors -- most good RF designers use 24 or 48 Volt RF transistors -- higher voltage -- lower current (This reduces the size of required PC board traces, wires -- by lowering the current requirements!!). You might want to look at the FoxDelta PC board (you could build 2 amps) http://www.foxdelta.com/products/rfamp.htm w9gb Read to bootom bit about 24 volts and 48 volts. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Friday, 11. February 2011, 00:32 Post #45 |
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This is why the Yaesu Quadra HF Linear that runs Motorola MRF150 devices runs at 48 Volts |
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| MadMark1 | Friday, 11. February 2011, 00:34 Post #46 |
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Your not taking into account the collector efficiencies, this improves as you increase the working voltages, its not the same as running from 12 volts, maths worked out on a calculator isnt the same as in the real world. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| ChrisC | Friday, 11. February 2011, 00:46 Post #47 |
26 Charlie Tango 437
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The differences in efficiency are not going to be so major it equates to double the run time as suggested earlier. sure you might get a little bit more but not massive amounts. 5%, 10% maybe? |
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| Deleted User | Friday, 11. February 2011, 12:24 Post #48 |
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The current draw on you 12v PSU will probably be even higher as a result due to the addition of loss in the step up transformer. |
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| MadMark1 | Friday, 11. February 2011, 13:09 Post #49 |
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163 Charlie Tango 020
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Yes a step-up transformer would be pointless really, two decent car batteries wired in series will do the job, and they need not be huge monsters as the current drawn from the 24 volt KL500 isnt very high, Not compared to the 12 volt version . Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Richy | Friday, 11. February 2011, 15:02 Post #50 |
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also dont forget the 24v rm and the 12v rm have two totally different transistors in them anyway!!! if i was going to spend some cash on a new amp i would forget the rm stuff and go for the ameritron or something! i know its more money but you really do get what you pay for!! and yes the mosfets can be volted to a silly amount !! also with the ameritron i believe you get the high volt transformer with it ! its not just the amp that you are paying for!! 73s. |
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| MadMark1 | Friday, 11. February 2011, 16:16 Post #51 |
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163 Charlie Tango 020
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Does'nt the Ameritron use 4 times 2sc2879 bipolar transistors ? Maybe the new version does use Fets. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Friday, 11. February 2011, 16:33 Post #52 |
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I just don't have Ameratron money spare.........talking of them, that is what we used for 48 hours on "Railways On The Air 2010".........Video http://www.youtube.com/watch?v=clL_Qj8-tWU
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| Deleted User | Friday, 11. February 2011, 17:03 Post #53 |
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Please keep it on topic, thank you. Gets untidy otherwise. |
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| Richy | Friday, 11. February 2011, 18:23 Post #54 |
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were not of topic!!! and yes mark the newer ameritrons are mosfet! 73s |
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| Deleted User | Friday, 11. February 2011, 19:05 Post #55 |
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Yes OK I put a video link in, but it has to do with the thread .............but it does show the Ameritron mentioned used in anger and that was the station and amp combo we worked you on Bob!. It also shows Solid State amps can take a good Hammering......check out the ampere Meter.......back to the thread......thanks |
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| Deleted User | Friday, 11. February 2011, 19:29 Post #56 |
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OK, thread - Zetagi B550P Vs RM KL500. Intersting information on solid state amps but a video of a Ameratron being given a good seeing too is a little wide concidering the said title. Shared electronics and operation maybe and again interesting it its own right but I still can't see how it might help anybody looking for a Zetagi B550P or RM KL500. Thats all. |
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| MadMark1 | Friday, 11. February 2011, 19:32 Post #57 |
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I see Martyn Lynch has a Ameritron on his site, its almost £700 though, thats a lot of money for a 400-500 watt Amp, ok the KL500 isnt a Ameritron but for the money, its a very good starting point, even if you spent a extra £150 on extras like replacing the matching transformers as this improves the lower frequency gain and switchable low pass filters and thermal shutdown etc, its still a cheap option. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Friday, 11. February 2011, 19:49 Post #58 |
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I agree Mark, the unit on the video was bought for around £500+ I think second hand, a cracking tool,and had 48 hours of hammer, this is when the top gear shows it's true colours but I will go the RM or Zetagi route ,modded or unmodded as firstly it is mainly for 10 meters use and I only have £200-£300 to spend. As I said before I have 3 very good top end tube amps for Ham use in my shack, so I just need something that makes cheapish power (but as clean as possible with the price parameters of coarse). Thanks for all your mod pointers and I understand peoples concerns for spurious emissions and lack of filtering (unless modded). But there's always the good old low pass filter after the amp I guess. This has been an interesting thread and has helped a few of us understand what can be done with cheaper CB amps. I can't find a Zeg' 550P at a fair price.........so it will be a RM KL500 24 volt with 2 HD yuasa batterys I have on stock and a pair of decent battery chargers.........when I use it base station. |
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| MadMark1 | Friday, 11. February 2011, 19:55 Post #59 |
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Thats true Dave its been good hearing everyones views on this amp, love them or hate them ( the amp i mean) there still a good amp for the money, and its upto the idividual as to if they modify them or not, it all comes down to what you want from the amp and what your willing to do with it.. So thats it for me on the KL500. Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Richy | Saturday, 12. February 2011, 18:58 Post #60 |
26 Charlie Tango 394
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thats actually a really good price for the ameritron!! considering that the so called rm ham amps can be anywere from £430!!! i know what i would rather have! £500 is even better lol. |
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