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Author Topic: Nice Amplifier  (Read 64025 times)
K4RVN
Member

Posts: 261




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« Reply #105 on: June 24, 2013, 08:52:55 PM »


N4ATS
looking at the site does not give much info for connecting the amp to a transceiver. Does it have a RCA type connector to accept the send line from a transceiver and a relay or do you need
to provide something outboard?
I have never owned a solid state amp and have not seen a photo of the back of the  subject amp. Thanks for any hook up info you could give.

Frank
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K4RVN
Member

Posts: 261




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« Reply #106 on: June 26, 2013, 09:26:03 AM »

Decided to buy a SB 200 for now, so lost interest in a solid state until later. Please disregard my previous posts if you have not already.
You would need a 45 amp continuous power supply for the rated output so with shipping, looking at over 700 bucks. Too much to try one for me.

Frank
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W1BR
Member

Posts: 4196




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« Reply #107 on: June 26, 2013, 09:39:48 AM »

One other problem is the lack for a standard for measuring IMD. Is IMD below carrier, or does it allow for a 6dB correction?

I don't mind honest 3rd order IMD amplifier specs, but many of these amplifiers are producing odd order IMD products that seem to go on forever!!! A tube amp can have poor 3rd and 5th order IMD, and yet produce less havoc than a solid state amp with similar 3rd order IMD specs and yet can pollute the band for hundreds of kHz.

Pete
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W4KVW
Member

Posts: 0




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« Reply #108 on: June 29, 2013, 09:47:46 AM »

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.

http://swap.qth.com/fcc/fcc-oklinear2.htm

Don't see ANYTHING they build listed as LEGAL for use in the USA.That is a bigger issue maybe no matter how well they work!

Clayton
W4KVW
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G3RZP
Member

Posts: 1321




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« Reply #109 on: June 29, 2013, 02:03:17 PM »

Historically, we measured IMD as dB below PEP. So 30dB below one tone was 36dB below PEP: that was the 'magic' level acceptable for ISB. However, that was a 30kW PEP tx with a 12kHz channel width - 2 telephone channels on USB, and two 3kHz wide Multi Channel Voice Frequency Telegraphy channels on LSB, each one with 4 teletype channels  on it. But these days, it's guess work what the IMD is relative to.
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KH6AQ
Member

Posts: 7998




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« Reply #110 on: June 30, 2013, 06:20:27 AM »

The ARRL tests and reports transmitter IMD products relative to PEP.

An example is on page 12...

       http://www.radiomanual.info/schemi/IC746PRO_ARRLtest.pdf

Here is the standard for Maritime Mobile SSB transmitters, ETSI EN 300 373-2 V1.2.1 (2009-12)

      http://www.etsi.org/deliver/etsi_en/300300_300399/30037302/01.02.01_60/en_30037302v010201p.pdf

On page 10,11 the maximum allowed IMD for a transmitter of greater than 250 watts is 25 dB below one tone for normal test conditions. That is -31 dB relative to PEP.

« Last Edit: June 30, 2013, 06:41:00 AM by WX7G » Logged
G3RZP
Member

Posts: 1321




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« Reply #111 on: June 30, 2013, 08:10:57 AM »

I was referring to the amateur case where it isn't always stated in all reviews......

Interestingly, the ETSI standard for commercially available amateur radio only has measurement uncertainty for powers up to 160 watts - I was told that this is because there is no IEC standard available above that power. One must then ask from where the maritime standard gets its measurement uncertainty......which is twice the amateur one.

Now I'm retired with some time on my hands, I may well email the Chairman of ERM_TG26 and ask him - especially as I am still a corresponding member of that group!
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CHOKEOLOKO

Posts: 47




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« Reply #112 on: June 30, 2013, 04:15:27 PM »

I bought the BLA-350. I have had very good audio clarity and I have had a relatively local ham check his bandscope during transmission and I don't splatter.

Don't be the CB radio stereotype and overdrive your amp. I see people all_the_time splattering 3khz on either side of their USB transmission. I haven't found one using an RM Italy product.
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HA5BWW
Member

Posts: 10




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« Reply #113 on: July 12, 2014, 07:34:19 AM »

Today I bought a good piece about 170USD. The total power is more, than 100 Watts.
By my practice from Hungary with a HF9V is enough.
Beatuful contruction, and I have enough place in my shack (under the LT2S): see my page on qrz.com.
I have for spare a pair of MRF150...  Cheesy
Ed/HA5BWW
« Last Edit: July 12, 2014, 07:38:19 AM by HA5BWW » Logged
JS6TMW
Member

Posts: 1257




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« Reply #114 on: July 10, 2015, 02:48:49 AM »

Sorry (?) to re-open this topic, but has anyone ever succeeded in getting a reply to an email to RM Italy (USA)?
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W1BR
Member

Posts: 4196




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« Reply #115 on: July 10, 2015, 08:05:45 AM »

I bought the BLA-350. I have had very good audio clarity and I have had a relatively local ham check his bandscope during transmission and I don't splatter.

Don't be the CB radio stereotype and overdrive your amp. I see people all_the_time splattering 3khz on either side of their USB transmission. I haven't found one using an RM Italy product.

What the heck does "audio clarity" have to do with spectral purity?? Harmonics or IMD products?  The amp could be run nearly into Class C, and still garner good audio reports...

Pete
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