Ulf
I suspect we are the same "Get it done". Not a science project. Though
science comes into it.
I just find the various new devices may be more easily obtained. L&Cs are
getting hard to come by.
So far I don't have failed FETs or anything else. But that day will come.
Regards
Paul
On Wed, Aug 26
Hi
> On Aug 27, 2020, at 10:35 AM, Poul-Henning Kamp wrote:
>
>
> Bob kb8tq writes:
>
>> Common wisdom is that there is a filter in the cavity match that
>> is specific to 60 MHz. Putting in 120 MHz apparently does not work
>> well. I haven’t tried it so I’m just passing on what I’ve
Magnus Danielson writes:
> 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.
If we are going to (as I hope) DDS synthesis, then there are better
modulation *patterns* than the cur
Bob kb8tq writes:
> Common wisdom is that there is a filter in the cavity match that
> is specific to 60 MHz. Putting in 120 MHz apparently does not work
> well. I haven’t tried it so I’m just passing on what I’ve heard.
Driving step-diodes is a bit of an art, and the relationship betwe
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 rea
Hi
Unless you are going to dig in and rebuild the microwave part of the physics
package,
you are limited in terms of what you can or can’t do. The SRD setup seems to be
a bit
unique in the 5065 so messing with it probably isn’t a good idea.
Common wisdom is that there is a filter in the cavity
Hej Ulf,
On 2020-08-26 09:09, Ulf Kylenfall via time-nuts wrote:
> Paul,
>
> A 60 MHz xtal oscillator divided by 12 and comparedwith the incoming 5 MHz.
> Then there is this thing
> how to acheive a good symmetrical FM injecting
> the 137 Hz signal without affecting the loop filterparameters.
>
>
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. I
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.
A question
The 137 is injected at
Paul,
A 60 MHz xtal oscillator divided by 12 and comparedwith the incoming 5 MHz.
Then there is this thing
how to acheive a good symmetrical FM injecting
the 137 Hz signal without affecting the loop filterparameters.
Keeping the original design with modern typesof semiconductors is less
work/ef
Luciano,
Yes, the ovens in the cavity are working correctly.
What destroyed the 5065A in the first place 1988 wasa very high raw input
voltage approaching 40V(something wrong with the AC Xformer that possibly
caused the original cavity windings to short circuit ?)
I got help from Corby Dawson ho
..Continued.
Having discovered that the A3 multiplier went bad the firsttime after a few
hours of service, I checked the A3 unitfrom a scrapped 5065 on my bench. It was
neverinserted in the once working unit : DOA
The problem with some of the plastic packaged FETs wasthe same. Also that
o
Ulf,
The A1 modules are most likely OK.
They do not need stellar performance for the 5065A to easily beat spec.
The A3 modules are another matter!
If you are indeed feeding them with 1VRMS and can't get a good output at
J8 then something is not right!
HP made several versions of the A3, the se
C)
Oggetto [time-nuts] Dead 5065A - Some comments - Some questions...
Greetings.
Having had my 5065 disconnected several months
due to all sorts of things, and started it up
yesterday. It was dead. "Pining for the fjords"
No 2nd harmonic. Just PhotoCurrent. Quick Phase Ch
Ulf Kylenfall via time-nuts writes:
> I checked the A1 syntesizer unit which did
> provide correct output frequencies but
> they were not as stable [...]
> I have two of these synthesizers, but they are
> both the 1st edition using TO packaged
> IC's that are unobtanium. One of my manual
Greetings.
Having had my 5065 disconnected several months
due to all sorts of things, and started it up
yesterday. It was dead. "Pining for the fjords"
No 2nd harmonic. Just PhotoCurrent. Quick Phase Checkusing a scope in X/Y-mode
returned a "U" instead of a bump
And most of the rest was noise.
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