Following the discussion on the Syncal 2000, can anybody help me with:

1.? Technical manual - not user handbook

2. A pin out of the 7 pin output to the AAMTU?? (How many of the pins are used?)

Thanks

Mike

2 Messages

Digest #1844

1a

Re: Question on Syncal 2000 - Chapter 2 by "Peter Gottlieb" hpnpilot219

1b

Re: Question on Syncal 2000 - Chapter 2 by "W2HX" w2hx_w2hx

Messages

1a

Re: Question on Syncal 2000 - Chapter 2

Mon Sep?16,?2019 6:51?pm (PDT) . Posted by:

"Peter Gottlieb" hpnpilot219

I was finally able to get the radio to the bench.

The hi-lo tone is always in the background low on receive, and loud during tune
and PTT.? According to the manual this is indeed the synthesizer out of lock.

I tested with heat and cold but it is now quite solidly on and insensitive to
temperature.? I guess that's helpful.

On the synthesizer board there are two out of lock (OOL) indications, OOL1 and
OOL2.? Each goes to an I/O expander on the SPI bus.? They also are both or'ed
from a different point in the circuit to disable the transmitter.

The transmitter is not disabled, indicating the there is no OOL condition.
Both OOL signals show false at the I/O expander chip.
All self tests pass, and the manual states that self test checks for an OOL
condition.
Receive seems ok and transmit puts out a good modulated signal.

I am thinking that:

1)? Transmitter enabled, receive and transmit good, and both OOL signals false
indicate there is no synthesizer unlock condition present,
2)? Since self-test isn't seeing this problem, the I/O expander is good and the
control processor isn't seeing this fault.

That leads me to the tone generation circuits as a possible problem, falsely
indicating a fault when there is none.

Further analysis in that direction will be for Chapter 3.

Peter
KB2VTL

On 8/30/2019 8:50 AM, M0ORE m0ore@... [Racal-manpacks] wrote:
>
> Did you check the supply voltage at source i.e. battery terminals or actually
> at rig. Might be a significant voltage drop due to leads not thick enough or a
> poor connection.
>
> On 30/08/2019 13:24, Scott Dorsey kludge@... [Racal-manpacks] wrote:
>>
>> Synthesizer is out of lock. Look for bad decoupling capacitors which might
>> be fine in an air conditioned shop but will go out of spec in the hot sun.
>> --scott
>>
>

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1b

Re: Question on Syncal 2000 - Chapter 2

Mon Sep?16,?2019 7:05?pm (PDT) . Posted by:

"W2HX" w2hx_w2hx

I agree with your analysis to check the circuit that injects the error tone into the audio, perhaps it is being falsely triggered.
________________________________________
From: Racal-manpacks@... <Racal-manpacks@...> on behalf of Peter Gottlieb hpnpilot@... [Racal-manpacks] <Racal-manpacks@...>
Sent: Monday, September 16, 2019 9:51 PM
To: Racal-manpacks@...
Subject: Re: [Racal-manpacks] Question on Syncal 2000 - Chapter 2

I was finally able to get the radio to the bench.

The hi-lo tone is always in the background low on receive, and loud during tune
and PTT. According to the manual this is indeed the synthesizer out of lock.

I tested with heat and cold but it is now quite solidly on and insensitive to
temperature. I guess that's helpful.

On the synthesizer board there are two out of lock (OOL) indications, OOL1 and
OOL2. Each goes to an I/O expander on the SPI bus. They also are both or'ed
from a different point in the circuit to disable the transmitter.

The transmitter is not disabled, indicating the there is no OOL condition.
Both OOL signals show false at the I/O expander chip.
All self tests pass, and the manual states that self test checks for an OOL
condition.
Receive seems ok and transmit puts out a good modulated signal.

I am thinking that:

1) Transmitter enabled, receive and transmit good, and both OOL signals false
indicate there is no synthesizer unlock condition present,
2) Since self-test isn't seeing this problem, the I/O expander is good and the
control processor isn't seeing this fault.

That leads me to the tone generation circuits as a possible problem, falsely
indicating a fault when there is none.

Further analysis in that direction will be for Chapter 3.

Peter
KB2VTL

On 8/30/2019 8:50 AM, M0ORE m0ore@... [Racal-manpacks] wrote:
>
> Did you check the supply voltage at source i.e. battery terminals or actually
> at rig. Might be a significant voltage drop due to leads not thick enough or a
> poor connection.
>
> On 30/08/2019 13:24, Scott Dorsey kludge@... [Racal-manpacks] wrote:
>>
>> Synthesizer is out of lock. Look for bad decoupling capacitors which might
>> be fine in an air conditioned shop but will go out of spec in the hot sun.
>> --scott
>>
>

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