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Re: RMItaly BLA600

 

Hi Bob

Could be...I heard the same thing regarding ICOM but was not sure if
its multiple radios or just the 706.

RMItaly says they only recommend using the ALC jack if you are mostly on 1 band
else if you change bands, you have to reset and re-adj.

The owner of this one only works 6M, so I am gonna have him try and hook up the
ALC and set it up in the amps ALC on screen menu. Its got a MIN and a MAX
and (2) trimpots near the RCA jack to set MIN/MAX.

The owners manual is sort of vague for the amp but last night on 80M
I could put no more than about 10W peak ssb mod to it, else it would trip
to sdby with errors that usually indicated the RF input was too much.

Other hams call these "CB AMPS", and those usually are designed with maybe
5-12W inputs from AM or SSB so maybe its working as designed.

Hes running it on 110V power, maybe on 220/240 they would allow more headroom?

--
Steve Hearns [ KA2PTE ]
Technotronic Dimensions, VT [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
E-Mail: Steve@...

----- Original Message -----
From: "Bob" <W4JFABob@...>
To: <[email protected]>
Sent: Tuesday, September 10, 2024 8:44 AM
Subject: Re: [ham-amplifiers] RMItaly BLA600


Steve, I have read that the Icom 706 has a very bad amplifier overshoot. I
wonder if that's what caused the owner's problem?
I don't have any experience with a 706 myself, I've only read about it. I
wonder if your 930 does as well?
Just a thought.
Bob W4JFA

On Tue, Sep 10, 2024 at 8:25?AM Technotronic Dimensions via groups.io
<steve@...> wrote:

Fixing one of these up, had a blown LDMOS FET now
ok on CW, but SSB trips a lot of error protect faults related to I think
the
peak power during modulation input to the amp.

It claims > 25W is what brings it into protect and my Kenwood 930S
trips it in SSB no matter how low the output is. My KW 850S has better
Carrier and FR out controls, so I can bring it down much lower and it
seems to be ok with that rigg.

This is running on 110V hookup, I get about 450W CW carrier,
and most I can see on the average analog power meter is like 200W
and thats almost full bars on the amps power bar meter on the front
panel, so I am left to believe this is its intended operation without
using ALC?

The owner of the amp uses an ICOM 706MK2 with no ALC on the AMP, but I
believe
it does have an ALC output.

I have never ran an amp with the ALC from the rigg, but its suppose to I
guess
limit the spikes I am seeing which also reduces the buckshot side splatter
from the
inherent IMD they produce?

--
Steve Hearns [ KA2PTE ]
Technotronic Dimensions, VT [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM <>
E-Mail: Steve@...
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