Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: HLA-150 IMD test results RM Italy  (Read 5630 times)
W8JI
Member

Posts: 9296


WWW

Ignore
« on: March 19, 2010, 07:45:44 PM »

The HLA-150 IM results are in.

http://www.w8ji.com/rm_hla-150_test.htm

Logged
K6AER
Member

Posts: 3535




Ignore
« Reply #1 on: March 19, 2010, 11:04:12 PM »

Tom,

Very nice write up. Did the amplifier use the SD1446 transistors? I have a HLA-300V and saw similar results at about 250 watts. The unit I have uses 4 of the Thompson devices.

The amplifier looks adequate for a FT-817 to get up to 90 watts if you don’t get greedy. As with all specifications there is no free lunch.  

Mike
Logged
KE3WD
Member

Posts: 5689




Ignore
« Reply #2 on: March 20, 2010, 08:19:28 AM »

"Products are 3rd, 5th, 7th, 9th, 11th, and 13th. They actually go on forever it seems."

The "Texas Star 250" equivalent? 

Sure. 

But we already knew that.  Or some of us likely did. 

Good stuff, W8JI. 

The sad part is that if they would only advertise the doggone thing as what it really is, ie the equivalent of the "average" PA in the "average" solid state 100W radio, or perhaps I should say, "slightly below average" -- they would look a lot better.  Telling noobs and the perpetual watt-squeezers that the thing is capable of 300W is the recipe for interference disaster. 

TANSTAAFL applies. 

Now that you can see inside as well as peruse their skats, what do you think of their bias circuitry implementation, Tom? 

And thanks much for the report! 

Logged
N9MXY
Member

Posts: 240




Ignore
« Reply #3 on: March 20, 2010, 04:29:02 PM »

Yep, there's no way to "miracle" clean wattage above spec in a transistor.  Does this thing have a selectable bandpass filter for the output? At some point you'd think that would null the 9th, 11th 13th etc order harmonics.
Logged
WB2WIK
Member

Posts: 20669




Ignore
« Reply #4 on: March 20, 2010, 04:44:10 PM »

>RE: HLA-150 IMD test results RM Italy    Reply
by N9MXY on March 20, 2010    Mail this to a friend!
Yep, there's no way to "miracle" clean wattage above spec in a transistor.  Does this thing have a selectable bandpass filter for the output? At some point you'd think that would null the 9th, 11th 13th etc order harmonics.<

::I guess you missed the class on IMD. ;-)

IMD isn't "harmonics" of the carrier frequency, it's harmonics of the modulation frequency.  They all fall within the band, so low pass filters do nothing for this.
Logged
W8JI
Member

Posts: 9296


WWW

Ignore
« Reply #5 on: March 20, 2010, 06:54:41 PM »

Sorry for the delay.

Thinking about this, I would call this a 90 watt PEP amp. It is not 150 watts, it certainly is not 300 watts PEP because it can't ever run more than 155 watts no matter how much drive power is applied.

It is about like a FT1000MP on the WORSE band for the 1000MP with the HLA-150 at 90 watts PEP.

It is considerably worse than the FT1000MP for high order IMD with the HLA150 at 120 watts PEP.

It never cleans up significantly, not at any power.

It is very good on harmonics, so the filters are working.

Logged
G3RZP
Member

Posts: 4969




Ignore
« Reply #6 on: March 21, 2010, 12:41:25 AM »

Is anyone very surprised at the results? The 300 watts  claim maybe derives fom the old 'music power' ratings - max output single tone is X watts, 'music power' = 2X watts.
Logged
K2TY
Member

Posts: 20




Ignore
« Reply #7 on: March 21, 2010, 03:32:20 PM »

The 300 watts claim....

Not that it matters much as there is a hell of a difference between 90 and 250 but the manufacturer claims 250 watts max. No where in the manufacturers documentation do I see 300.

http://www.rmitaly.com/scheda.asp?IDGr=1&cat=19&tipo=185

Perhaps some posters are confusing the HLA 150 and HLA 300.

Tom would you operate this amp at the 90 watt level? If so, would padding the input be an acceptable solution?
Logged
KF6QEX
Member

Posts: 615




Ignore
« Reply #8 on: March 21, 2010, 03:50:20 PM »

I find it a little interesting that the model number is "close" to the power output of the amp.
Perhaps there is a European way of determining pep (involving a good year of Chianti)  we are unaware of Smiley

The amps do look beautiful though inside and out Smiley


Logged
W8JI
Member

Posts: 9296


WWW

Ignore
« Reply #9 on: March 22, 2010, 07:01:25 AM »

The 300 watts claim....

Not that it matters much as there is a hell of a difference between 90 and 250 but the manufacturer claims 250 watts max. No where in the manufacturers documentation do I see 300.

http://www.rmitaly.com/scheda.asp?IDGr=1&cat=19&tipo=185

Perhaps some posters are confusing the HLA 150 and HLA 300.

Tom would you operate this amp at the 90 watt level? If so, would padding the input be an acceptable solution?

If you activate the microcontroller inside, it not only puts birdies on the ham bands.... it also fails FCC emissions for computing devices with no drive. It is also not fixable because of the lack of shielding in the controller area.

:-)


It is OK at 90 watts. Maybe with a bigger input pad. At 90 watts on the best bands it is just slightly worse than a Ft1000MP on the worse bands. So it is in the ballpark of a typical radio on the radio's worse bands.

Logged
N6PJB
Member

Posts: 15




Ignore
« Reply #10 on: March 22, 2010, 10:36:10 AM »

Thank you, Tom, for a very informative article. Your the MAN!

Philip
Logged
N3OX
Member

Posts: 8847


WWW

Ignore
« Reply #11 on: March 22, 2010, 12:00:54 PM »

Tom,

It would be useful if you had a plot on your page of a better performing system to compare to ... especially one that rolls the higher order products down faster...

73
Dan
Logged

73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!