Magnus agree on the bandwidth tripling. I thought the A3 generated 90 MHz. I was thinking the PLL at 90 MHz with a small power amplifier to drive the multiplier. I did see the pictures of the modernized A3 so thats a great answer. Ultimately my concern has been the SRD multiplier. There is some real magic going on in that unit as has been mentioned on time-nuts. If the diode goes there are no replacements accept for another unit. Regards Paul.
On Thu, Aug 27, 2020 at 8:19 AM Magnus Danielson <[email protected]> wrote: > Hi Paul, > > On 2020-08-26 17:11, paul swed wrote: > > Ulf I was thinking the 137 Hz was injected differently. But yes its a > > varicap on the 5 Mhz signal. Still that same effect can be accomplished > in > > the PLL feedback loop. I would simply go try these things but can not > hack > > my one and only 5065. Its working just fine. > Arn't you curious about making it work finer? :) > > A question > > The 137 is injected at 5Mhz isn't it multiplied to a FM swing of 2466 Hz > at > > 90 MHz? Granted close in sidebands would still contain 137 Hz. > > No, the modulation frequency would still be the same, but the modulation > width scale up as the carrier scales up. Thus, the frequency deviation > scales up. > > As you are a ham, I will make you recall the old days. In the old days > as people aimed to reach the 70 cm band, they used their 2 m equipment > and trippled the frequency. This makes the 144 MHz go to 432 MHz, the 25 > kHz deviation go to 75 kHz deviation and the modulated voice stays the > same pitch as it had on 144 MHz and does not pitch up about 1.5 octaves. > > Cheers, > Magnus > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
