If you want the amplifier to be resonate in a split for which it was not
designed, you have to change the resonating parts. If you do not want the
amplifier to be resonate, do not change the resonating parts. If I drive a
80 Meter amplifier hard enough with a 40 Meter signal, you will get a 40
Meter signal out, but the amplifier is not resonate. If you resonate the
amplifier, the current drawn goes down and heat produced goes down for a
specified output. The Micor amplifier used transistors that were not
constant impedance. As you shift the amplifier from resonance, current goes
up, heat goes up, power goes down and spurious products go up as the
impedance of the transistor changes. The reason Motorola designed the
amplifier in four ranges to cover 136 to 174 was to keep the impedance of
the stages correct over the frequency range. You can become a good neighbor
and operate the amplifier at resonance, or you can operate it off resonance
and stand a good chance of helping to deny hams access to other towers
owned by the company that is providing you tower space.
My suggestion is operate the amplifier at resonance, keep your power bill
down, keep your repair costs down and become a good neighbor to the other
users of the RF spectrum.
73
Glenn
WB4UIV
At 01:28 PM 06/02/04, you wrote:
>Try using a short piece of 75 ohm feedline and watch the smoke come from
>the caps over the finals - your existing phase detector won't work well
>off the laboratory test bench. Most of the caps need to be increased
>slightly and the two blocks which are bandpass filters will need to be
>changed or modded to allow the full potential to reach the phase
>detector located next to the output port, make sure you have a 80-110
>watt phase detector board in place before you hike to the repeater site
>and connect.
>
>w9mwq wrote:
> >
> > I have a Micor TLD1693 amp, designed for the 150 to 162 Mhz range,
> > and am told that the amp will not operate at the 146 Mhz range, told
> > that componets have to be changed. Here is what I don't understand
> > about it, maybe someone can help expain it. Into a Cushman serive
> > monitor, I'm getting 100 Watts out of the amp at both 146.925 and
> > 154.115 Mhz, keyed down the temperature is the same after a 5 min
> > keyup test, allowed to cool down for each test. I see no spikes or
> > spurs at either frequency. Granted this will be used on a repeater
> > and key down times can go much longer, but why would this amp not
> > operate at 2 meters, just cause Motorola says the specs are for 150
> > to 162. I've seen amps go from 138 to 174 with no problems, just a
> > matter of tweaking. So help me to understand what the difference
> > really is between the TLD1693 and the TLD1692 amps. Thanks.
> >
> > Mathew
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>--
>73...Clark Beckman N8PZD
>
>Pursuant to U.S. Code, title 47, Chapter 5, Subchapter II, �227,
>"Any and all nonsolicited commercial E-mail sent to this address
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>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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