[NLRS] RF Concepts Amp Question

[jcplatt1 at mmm.com]

Hi Scott.

I do not have intimate knowledge of that particular amp, but all these
bricks are usually the same.   The two compression caps are most likely the
tuning for the input and output stages.   I would recommend that you simply
adjust both for maximum RF output.  On these bricks there usually is not an
input  drive adjustment.  The previous user may have "detuned" these tuning
caps in order to drop the power.

Unless you have a good power meter (Bird, etc), the accuracy of most power
meters is perhaps +/- 10 % AT full scale.    At something less than full
scale the accuracy is most likely worse than +/- 10%.

And although we all like to see the power meter go way up scale, going from
110 to 150 watts is only a 1.4 dB improvement - something that would be
very hard for anyone to detect.

73, Jon
W0ZQ



                                                                           
             "KB0NLY"                                                      
             <kb0nly at mchsi.com                                             
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                                                                   Subject 
                                       [NLRS] RF Concepts Amp Question     
             11/30/07 03:32 PM                                             
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           






Anyone familiar with the RF Concepts Max 45 2m amp?  Its supposed be rated
for 45w in 150w out according to the manual i got with this one.  I can
only
get about 110w output.

Years ago i had a similar model Mirage amp that someone else had readjusted

for 100w output instead of 160w output.  And i remember adjusting something

inside, trimmer caps in the pa if i recall correctly.

I opened this one up and see one large compression trimmer on the input
side
of the amp after the T/R relay, and one next to each transistor as well.  I

can't find any service information for this model online, as a matter of
fact i can't find anything for this model online.  Anyone know how to make
adjustments to this model?  I would like to see it doing at least the rated

output.

The previous owner said it was too much power for him and he turned it down

to 100w according to his wattmeter, mine shows 110w.  Unfortunately he
doesn't remember what he had to adjust to do that since it was years back.

Thanks in advance...

73,

Scott KB0NLY

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