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Author Topic: Nice Amplifier  (Read 64003 times)
N4ATS
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Posts: 1305




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« on: May 26, 2013, 04:45:12 AM »

These amps are a lot of bang for the buck and work VERY well. They are built with extreme quality and actually look good...

http://www.amazon.com/RM-Italy-HLA-300V-Professional-Amplifier/dp/B0057QNGUS/ref=sr_1_1?ie=UTF8&qid=1369568567&sr=8-1&keywords=HLA+300V
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W5JON
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Posts: 373




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« Reply #1 on: May 26, 2013, 05:15:55 AM »

Stand-by...... here it comes.....  73,  John
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KE3WD
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Posts: 5688




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« Reply #2 on: May 26, 2013, 05:54:35 AM »

In 3-2-1...


 Grin
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WD5GWY
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Posts: 457




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« Reply #3 on: May 26, 2013, 06:26:30 AM »

Zenki must be asleep!!!
(it's CB crap!)
there, I said it!!
james
WD5GWY
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KA5N
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Posts: 4380




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« Reply #4 on: May 26, 2013, 06:31:01 AM »

I don't understand!   What is a professional amplifier (for amateurs) and who are
the fans?  Is there a fan club? Huh

Allen KA5N
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KE3WD
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« Reply #5 on: May 26, 2013, 07:35:29 AM »

The fans cool the heatsink. 

If it has a fan, that is. 

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G3RZP
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Posts: 1315




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« Reply #6 on: May 26, 2013, 08:10:07 AM »

The picture shows fans for cooling. The rather sparse data suggests it may not be that bad - which doesn't mean that it is good.
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N4ATS
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Posts: 1305




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« Reply #7 on: May 26, 2013, 08:51:20 AM »

Why not try it , I did , works great , 450 watts output , auto tracking and for in the car , easy to install. Thing is built WAY better than the us elchepo SS amp that one can only buy from one place and pray it works.

Power meter works flawless , HUGE hint sink.

"CB Junk" may be , who the heck cares if it works great for in the car?
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WD5GWY
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Posts: 457




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« Reply #8 on: May 26, 2013, 09:54:49 AM »

Why not try it , I did , works great , 450 watts output , auto tracking and for in the car , easy to install. Thing is built WAY better than the us elchepo SS amp that one can only buy from one place and pray it works.

Power meter works flawless , HUGE hint sink.

"CB Junk" may be , who the heck cares if it works great for in the car?
Who cares? Maybe the people up and down the band you are splattering all over care!
james
WD5GWY
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N4ATS
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Posts: 1305




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« Reply #9 on: May 26, 2013, 10:22:44 AM »

Just for curiosity , why would you be mindset it"spatters" with out looking at it or trying it? Is it just because someone said it was a "cb" amp? Its actually NOT a CB amp for sure with the BPF in it. I looked at it pretty close at work on the bench , its very clean compaired to my other amp.

They have a very well designed BPF in them , here is the schematic , VERY well designed

http://www.rmitaly.com/download/instructions/HLA300-instruction_rel_100.pdf
« Last Edit: May 26, 2013, 10:26:35 AM by N4ATS » Logged
N0YXB
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Posts: 1558




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« Reply #10 on: May 26, 2013, 11:12:21 AM »

Just for curiosity , why would you be mindset it"spatters" with out looking at it or trying it?

Perhaps because you said,"CB Junk" may be , who the heck cares if it works great for in the car?"

Or perhaps because of the reputation that this manufacturer has cultivated?
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KH6AQ
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Posts: 7985




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« Reply #11 on: May 26, 2013, 01:23:03 PM »

The amp is fused for 40 amps DC input, specified for 45 amps DC input, yet is rated for 550 watts CW. How do they do that? I thought that would take 100 amps DC input.
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M0HCN
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Posts: 566




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« Reply #12 on: May 26, 2013, 01:31:55 PM »

Also as far as I can see the bias regulator does not look near stiff enough to supply the current required at rated output in class AB.

Low pass networks are actually the easy bit in solid state ham amps, it is envelope linearity that tends to be problematic, particularly in low voltage bipolar designs like this one, and no amount of filtering helps with that.     

I have never used one of these (or even had one on the bench) so I must reserve comment on measured performance, but the power demand numbers not adding up and the bias thing would worry me.

73 Dan.
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N4ATS
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Posts: 1305




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« Reply #13 on: May 26, 2013, 05:14:01 PM »

The Comment was made from the above person about it being "CB Junk" . not me. I just bought one to try it out , they work great.
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KD6KWZ
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Posts: 302




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« Reply #14 on: May 26, 2013, 05:56:50 PM »

At least this amp has documentation! It's the amps that you can find details about that I would not think of touching.
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