Re: TinySA Ultra 50 Khz as a signal generator
A negative
S-Meter deflection is not uncommon in radios of this era.? With no
signal input and maybe a match 50-ohm load on the antenna port with the RF Gain set to maximum clockwise rotation, there should be an adjustment
to set the S-Meter to Zero.? Then, any additional signal should deflect
the meter upward.? Also, in that era, it would not be at all uncommon for the
meter to deflect upward as the RF gain is reduced (counter-clockwise
rotation).?
My
Kenwood TS-130 and TS-700A, and both my Swan SS-100 and 100MXA, and Icom 71A (receiver
only) operate in such a manner.? I haven't tested the others.....
Dave - W?LEV
A negative S-Meter deflection is not uncommon in radios of this era.? With no signal input and maybe a match 50-ohm load on the antenna port with the RG Gain set to maximum clockwise rotation, there should be an adjustment to set the S-Meter to Zero.? Then, any additional signal should deflect the meter upward.? Also, in that era, it would not be uncommon for the meter to deflect upward as the RG gain is reduced (counter-clockwise rotation).?
My Kenwood TS-130 and TS-700A, both my Swan SS-100, and Icom 71A (receiver only) operate in such a manner.? I haven't tested the others.....
Dave - W?LEV
You need to find out why your meter is deflecting negative. The manual does a good job of explaining how the circuits work. See section 4.9 AVC System. Are you using a DC blocking capacitor in series with your generator signal? Are the three power supply voltages normal? Do voltage readings agree with the DC voltage charts in the manual? Troubleshoot.
On Sun, 25 May 2025 07:51:44 -0700
"enriqueeeeee2001 via " <enriqueeeeee2001=[email protected]> wrote:
> Hello Kurt, thanks for your comments. Answering your questions and indications:
>
> 1. S-.meter is always deflected (negative going) because according to the mnual indicates the RF gain control must be fully clockwise, so it does not matter if the Tiny is on or off.
>
> 2.Yes as indicated in 1.
>
> 4. Done.
>
> 5. Moved the Tiny , no deflection in the S-meter and attenuator connected to the Rx antenna terminal. I have even put the Tiny inside a thick aluminium bag in order to shield it.
>
> I am not able to understand why the manual ask (point 4) for a slight AVC deflection if the RF gain is at its fullest.
>
> I attach a couple og pics showing the S-meter and the RF gain clockwise as the manual indicates. Can be noticed the S-meter deflection.
> Second pic shows the S-meter with Signal 1 but the RF gain at less than medium scale.
--
73
-Jim
NU0C
--
|
Re: TinySA Ultra 50 Khz as a signal generator
A negative S-Meter deflection is not uncommon in radios of this era.? With no signal input and maybe a match 50-ohm load on the antenna port with the RG Gain set to maximum clockwise rotation, there should be an adjustment to set the S-Meter to Zero.? Then, any additional signal should deflect the meter upward.? Also, in that era, it would not be uncommon for the meter to deflect upward as the RG gain is reduced (counter-clockwise rotation).?
My Kenwood TS-130 and TS-700A, both my Swan SS-100, and Icom 71A (receiver only) operate in such a manner.? I haven't tested the others.....
Dave - W?LEV
You need to find out why your meter is deflecting negative. The manual does a good job of explaining how the circuits work. See section 4.9 AVC System. Are you using a DC blocking capacitor in series with your generator signal? Are the three power supply voltages normal? Do voltage readings agree with the DC voltage charts in the manual? Troubleshoot.
On Sun, 25 May 2025 07:51:44 -0700
"enriqueeeeee2001 via " <enriqueeeeee2001=[email protected]> wrote:
> Hello Kurt, thanks for your comments. Answering your questions and indications:
>
> 1. S-.meter is always deflected (negative going) because according to the mnual indicates the RF gain control must be fully clockwise, so it does not matter if the Tiny is on or off.
>
> 2.Yes as indicated in 1.
>
> 4. Done.
>
> 5. Moved the Tiny , no deflection in the S-meter and attenuator connected to the Rx antenna terminal. I have even put the Tiny inside a thick aluminium bag in order to shield it.
>
> I am not able to understand why the manual ask (point 4) for a slight AVC deflection if the RF gain is at its fullest.
>
> I attach a couple og pics showing the S-meter and the RF gain clockwise as the manual indicates. Can be noticed the S-meter deflection.
> Second pic shows the S-meter with Signal 1 but the RF gain at less than medium scale.
--
73
-Jim
NU0C
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Re: TinySA Ultra 50 Khz as a signal generator
Voltage in Q25 emitter is -4,86v? I think is right
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Re: TinySA Ultra 50 Khz as a signal generator
What about the -5V used by the AVC circuit? You do not necessarily need to check ALL voltages. The primary interest is the AVC and S Meter circuits. Start there. Voltages will almost never be exactly what the chart says but +/- 10% can usually be considered OK. On Sun, 25 May 2025 10:19:13 -0700 "enriqueeeeee2001 via groups.io" <enriqueeeeee2001@...> wrote: Testing the PS? voltages , 9,95 v and should be 10 v ;? 13v and should be 12v. The other rx is similar 9,95 and 12, 85v
Testing all voltages charts will take me several days. -- 73 -Jim NU0C
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Re: TinySA Ultra 50 Khz as a signal generator
Definetely, one rx is not working correctly. I have tried with the second rx and when setting rf fully clockwise only goes to S-1 1 scale no deflection at all. I have connected the Tiny but not deflection at all.
?
Yes, I am using a DC blocker.
?
Testing the PS? voltages , 9,95 v and should be 10 v ;? 13v and should be 12v. The other rx is similar 9,95 and 12, 85v
?
Testing all voltages charts will take me several days.
|
Re: TinySA Ultra 50 Khz as a signal generator
You need to find out why your meter is deflecting negative. The manual does a good job of explaining how the circuits work. See section 4.9 AVC System. Are you using a DC blocking capacitor in series with your generator signal? Are the three power supply voltages normal? Do voltage readings agree with the DC voltage charts in the manual? Troubleshoot. On Sun, 25 May 2025 07:51:44 -0700 "enriqueeeeee2001 via groups.io" <enriqueeeeee2001@...> wrote: Hello Kurt, thanks for your comments. Answering your questions and indications:
1. S-.meter is always deflected (negative going) because according to the mnual indicates the RF gain control must be fully clockwise, so it does not matter if the Tiny is on or off.
2.Yes as indicated in 1.
4. Done.
5. Moved the Tiny , no deflection in the S-meter and attenuator connected to the Rx antenna terminal. I have even put the Tiny inside a thick aluminium bag in order to shield it.
I am not able to understand why the manual ask (point 4) for a slight AVC deflection if the RF gain is at its fullest.
I attach a couple og pics showing the S-meter and the RF gain clockwise as the manual indicates. Can be noticed the S-meter deflection.
Second pic shows the S-meter with Signal 1 but the RF gain at less than medium scale. -- 73 -Jim NU0C
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Re: HELP to Check car remote control ?
Use zero-span mode. See
?
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Re: TinySA Ultra 50 Khz as a signal generator
Hello Kurt, thanks for your comments. Answering your questions and indications:
?
?1. S-.meter is always deflected (negative going) because according to the mnual indicates the RF gain control must be fully clockwise, so it does not matter if the Tiny is on or off.
?
2.Yes as indicated in 1.
?
4. Done.
?
5. Moved the Tiny , no deflection in the S-meter and attenuator connected to the Rx antenna terminal. I have even put the Tiny inside a thick aluminium bag in order to shield it.
?
I am not able to understand why the manual ask (point 4) for a slight AVC deflection if the RF gain is at its fullest.
?
I attach a couple og pics showing the S-meter and the RF gain clockwise as the manual indicates. Can be noticed the S-meter deflection.
?Second pic shows the S-meter with Signal 1 but the RF gain at less than medium scale.
?
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HELP to Check car remote control ?
?
hi, ?
Help on how to check car remote control?
?
I wanted to do it with a digital oscilloscope but they say it's NOT possible ....
?
So with this tiny can I see not only the carrier RF radio but I am also interested in seeing the wave train of the transmitted coding?
?
Now is Possible or ? and how do I do, how should I set it to see in addition to the RF carrier also the train of waves of the coding impulses?
?
in ow mode i set it ???
?
TNX 73
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Re: TinySA Ultra 50 Khz as a signal generator
Replying Jim ,NUOC, yes, I have just tested the zero adjustment and it works as it should, not problem at all.
?
I have two SPR4,s and doing the same procedure with both.
?
?
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Re: TinySA Ultra 50 Khz as a signal generator
Hi Enrique I have followed the ¡±saga¡± about S meter deflection and noticed that cabinet radiation has not been covered. I you have removed the buttom plate of the transceiver it will received signals even if antenna input is not connected. - You have confirmed that when TinySA output is disabled the S-meter goes to 0.
- When noting connected to the RX antenna input and the TinySA output enabled does the S.Meter deflect to maximum ?
- If yes then the TynySA is sending the selected frequency diredtly out as a cabinet radiation as the case is plastic and the signal generation on the PC is highlevel and coupling capacitively via air into the wide open electronics of your receiver.
- I yes remove all DVM,s and mount he button plate such that the Drake is in normal condition, then repeat point ?3 and 4
- If still deflection then move the TinySA so S meter deflection is 0. It might be several meters. Now you may connect all attennuators directly to RX input and not at output of the TinySA
There is more to this story but let us hear what you experience Kind regards Kurt ????? ? ? just a remark: manual indicates that the rf gain must be clockwiseI have set full clocwise and the S-meter is totally deflected (negative going) and voltmeter readig is 1, 7 volts lowering the rf gain to a lecture in S-meter of 1, the voltmeter reading is 1,1 v. Tweaking the coils there is no movement neither in the S-meter nor in voltmeter.
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Re: Best settings for impulsive wide-band 6m RFI hunting
I have the same problem. I think it depends on a low quality photovoltaic inverter (probably Chinese).
Andrea, do you know how to intervene? the 6m band, when there is sun is totally unusable, noise at 9+.
thanks, best wishes and 73 ... by IW4AJR
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Re: Best settings for impulsive wide-band 6m RFI hunting
Did you find the source Andrea?
Please do share.
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Re: TinySA Ultra 50 Khz as a signal generator
>>> In the long long ago, this old
man nailed down a job by fixing a piece of consumer junk, a
transistor broadcast receiver.
>>> The boss was fed up with one
of his technicians. The guy had returned this receiver twice to
the customer saying that it was fixed. It was not fixed. It was
now back in for the third time. it would receive the
local stations just fine but not those 200 miles away.
>>> While the two of them went off
to lunch, I had a look at this thing. There didn't seem to be
enough voltage on the a.g.c. line with no signal. There was a
capacitor on the a.g.c. line (to ground in that rig). When the
capacitor was removed and measured, there was 2k across that
capacitor. When the boys returned from lunch, the 2k capacitor
was pushed across the bench to the boss. He was told that that
was a 2k capacitor. Instantly he started to say, in an annoyed
voice:"That's a capacitor..." and then halted in mid
sentence. The next Monday that technician was gone and this, at
the time, young man took over his bench.
>>> So...if there's
something"funny" going on in the a.g.c., before losing hair,
take a few moments to look for a source of leakage onto or off
the a.g.c. line!
>>> John,
>>> at radio station VE7AOV.
++++++++++
On 2025-05-24 15:14, enriqueeeeee2001
via groups.io wrote:
just a remark: manual indicates that the rf gain must be
clockwiseI have set full clocwise and the S-meter is totally
deflected (negative going) and voltmeter readig is 1, 7 volts
lowering the rf gain to a lecture in S-meter of 1, the voltmeter
reading is 1,1 v. Tweaking the coils there is no movement
neither in the S-meter nor in voltmeter.
--
|
Re: TinySA Ultra 50 Khz as a signal generator
This is starting to sound like an AVC system problem. Can you zero the S Meter with the zero adjust (section 5.3.5 in the manual) On Sat, 24 May 2025 15:14:00 -0700 "enriqueeeeee2001 via groups.io" <enriqueeeeee2001@...> wrote: just a remark: manual indicates that the rf gain must be clockwiseI have set full clocwise and the S-meter is totally deflected (negative going) and voltmeter readig is 1, 7 volts lowering the rf gain to a lecture in S-meter of 1, the voltmeter reading is 1,1 v. Tweaking the coils there is no movement neither in the S-meter nor in voltmeter. -- 73 -Jim NU0C
|
Re: TinySA Ultra 50 Khz as a signal generator
just a remark: manual indicates that the rf gain must be clockwiseI have set full clocwise and the S-meter is totally deflected (negative going) and voltmeter readig is 1, 7 volts lowering the rf gain to a lecture in S-meter of 1, the voltmeter reading is 1,1 v. Tweaking the coils there is no movement neither in the S-meter nor in voltmeter.
|
Re: TinySA Ultra 50 Khz as a signal generator
The attenuation injected is 130 db , toggle step attenuator plus fixed attenuators. The toggle attenuator works correctly.
?
Meter reading is always fixed to 1,7 v , it does not matter if the coils are turned.
?
?
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Re: TinySA Ultra 50 Khz as a signal generator
On Sat, May 24, 2025 at 03:00 PM, enriqueeeeee2001 wrote:
When the signal generator is off goes to zero again.
Then you are not attenuating the signal enough.
There is clearly a low-enough level to let the meter settle to zero, somewhere between where you are operating and zero signal.
You may need over 100dB of attenuation, at which point leakage becomes a possible issue.? ?My Wavetek RF generator has a 130dB output step attenuator.
Does the measured AGC voltage follow the meter reading?
73, Don N2VGU
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Re: TinySA Ultra 50 Khz as a signal generator
But at least the 30 db fixed attenuator should have worked together with the minimum level of the signal generator.
?
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Re: TinySA Ultra 50 Khz as a signal generator
No , S-meter stays deflected with and withaout attenuation and it does not matter tthe output level
of the Tiny.? When the signal generator is off goes to zero again. ?
If that is the case then your 100dB of attenuation is not working, it is either not 100dB at 50kHz or it is being bypassed somehow. Jeff
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Jim Shorney
Rud61
Kurt Poulsen
Loris Bollina
Donald S Brant Jr