Date   
Re: BlinkySWR progress

W6IPA
 

Vojtech,

This seems a very interesting project. What is your plan for programing the AtTiny ? 

Thanks,

JC/W6IPA

On Jan 10, 2020, at 8:01 AM, Vojtech Bubnik <bubnikv@...> wrote:

Funny facts:

The aluminum 1000uF capacitor costs half the AtTiny13A micro.
Two tantalum 470uF SMD capacitors cost 4x more than the AtTiny13A micro.
One 1000uF tantalum SMD capacitor costs slightly more than two tantalum 470uF SMD capacitors.


Re: BlinkySWR progress

Vojtech Bubnik
 

Funny facts:

The aluminum 1000uF capacitor costs half the AtTiny13A micro.
Two tantalum 470uF SMD capacitors cost 4x more than the AtTiny13A micro.
One 1000uF tantalum SMD capacitor costs slightly more than two tantalum 470uF SMD capacitors.

Re: BlinkySWR progress

Warren vk3byd
 

Looks good.
The 2 low profile SMD Tant's would be my choice.
Will make a neater and slightly more robust unit.

Warren.

Re: BlinkySWR progress

David Perry <bumbledp@...>
 

I dont mind.

David G4YVM 

Re: BlinkySWR progress

John
 

I would prefer it already installed or sourced so the $2 addition is fine with me

John ve3ips

Re: BlinkySWR progress

Vojtech Bubnik
 

We finally decided the antenna terminals for the full version: Two brass M3 screws soldered to the board, two 5mm long M3 hex standoffs + washers from the other side of the board. We will provide two 3D printed plastic knob sleeves over the M3 hex standoffs to grab them easily. This is a very robust and lightweight solution, it looks very nice, it is cheap and the 3D printing process will take reasonable time for such small components.

The SWR meter charges a large 1000uF capacitor, which is being discharged into the LED indicator after key off to indicate the measured power. The 1000uF capacitor is either fairly large
https://cz.mouser.com/ProductDetail/KEMET/ESK108M6R3AG3AA?qs=sGAEpiMZZMtZ1n0r9vR22bRn0aRzvAvuh6g3yruuOmY=

or 2x tantal SMD capacitors are quite expensive:
https://cz.mouser.com/ProductDetail/Vishay-Polytech/T55B477M2R5C0025?qs=sGAEpiMZZMtZ1n0r9vR22a0JuBUDvi6gXsVgSz72nyUxMWl5byRdEQ==

The attached photo shows the simple no-switch variant of the meter with the 2x tantal SMD capacitors.

We consider either to populate the board with the 2x low profile tantal SMD capacitors (likely $2 more expensive), or to provide an 8mm diameter, 11mm length aluminium capacitor to be soldered by the builder from the bottom of the board, leaving you the option to source the tantal SMD capacitors yourself.

Which do you prefer?

73, Vojtech OK1IAK

 

Re: ATS-V5 Picture

WA0ITP
 

Hold the fone, just found an earlier(first?) version in an earlier email attachment, here 'tis.




    
    
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 1/8/2020 5:23 PM, WA0ITP wrote:

Somehow I've missed seeing the picture of this little guy. I dont see it in the photos section, can anyone point me to it?  TIA
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 12/30/2019 9:15 AM, simon_hotchin via Groups.Io wrote:
Looks awesome to me.  If there is a list, count me in.

Simon, KK6ODM


Re: ATS-V5 Picture

WA0ITP
 

Somehow I've missed seeing the picture of this little guy. I dont dee it in the photos section, can anyone point me to it?  TIA
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 12/30/2019 9:15 AM, simon_hotchin via Groups.Io wrote:

Looks awesome to me.  If there is a list, count me in.

Simon, KK6ODM

Re: Compander AGC

Joe Street
 

Hi Brian

Your circuit is very clever and elegant in its simplicity using the current through the series diodes to modulate the on state resistance (a voltage divider essentially).  However the peak detector rectifies the audio waveform in order to drive the level control diodes and therefore is still subject to the time delay needed to integrate several cycles of the audio signal (several milliseconds) to generate the control voltage for the system.  I wish you could do another demonstration video but this time using CW.  This will show that in between words or maybe even characters (depending on the recovery time of the detector) the level control signal will change and there will be a disturbing pop or click on the next strong CW signal (especially annoying with headphone use).  If the peak detector was rectifying RF or IF those 3 to 5 cycles necessary to settle the drive signal are RF cycles and therefore happen so fast (microseconds) that the ear is not bombarded during the transition.  This is the real problem of any audio derived AGC and the reason I developed the technique I described earlier using the PIC micro which worked but ended up being rather complex.

Joe


On Sat, Jan 4, 2020 at 7:59 AM Brien Pepperdine <brianpepperdine@...> wrote:

I realise (in theory) that what is being discussed and wanted is internal  AGC /  limiting kind of stuff, but for those interested, or who might want to incorporate into a somewhat larger 'kit'.. this might be of interest. For interest's sake or for practical application.

FWIW - from Alan Wolke W2AEW, who knows a few things. From there.. to eternity ( I guess ).

https://www.youtube.com/watch?v=pUii_pDQxg8

Brian


Re: Compander AGC

Brien Pepperdine
 

I realise (in theory) that what is being discussed and wanted is internal  AGC /  limiting kind of stuff, but for those interested, or who might want to incorporate into a somewhat larger 'kit'.. this might be of interest. For interest's sake or for practical application.

FWIW - from Alan Wolke W2AEW, who knows a few things. From there.. to eternity ( I guess ).

https://www.youtube.com/watch?v=pUii_pDQxg8

Brian

---------- Original Message ----------
From: dl2arl@...
Date: January 3, 2020 at 7:57 PM

Hello Steven, Hello Group,
this posting is GREAT NEWS! But please be aware that for a kit to fit them all out there you might imperatively need some impedance setting device to fit for the headphone used and also for the desired AGC Kick-In Point to acommodate loud or quiet environements . There are many types of headphones out there and it is not said that the expensive ones are better, but they differ very much in what their impedance is concerned. So adapting the AGC for one specific headset will inevitably lead to malfunction with another one having an impedance ten-fold bigger or smaller.

These are only details! I think the sourcing of this AGC chip is a big step forward and rigs made for rough portable  use absolutely need one. They need one so desperately, that I seriously think of retro-fitting some of my MTR and ATS rigs with such an AGC.

On the other hand, I am happy to own one fabulous Rig, the SST, that has one of the simplest and most genial audio solution that I can think of, No! I do not ignore the difference between a limiter (that is what the SST has) and a full grown-up AGC, but I try to humbly express my enthusiasm for the simple and efficient solution the SST has. I also do not ignore the difference between an AGC solution working in the audio frequency stage (much more prone to "plopping") and one looping back as far as the Intermediate Frequency or even the front end. But let us keep it simple.

Wish you all a Happy New Year!
73 de Razvan DL2ARL


 

Re: Compander AGC

Joe Street
 

Hey Razvan

I agree with your comments.  The AGC subject is always a good one and the configuration of it for different situations is really nice if the equipment allows you that level of control, otherwise it might be better riding the gain control by hand!   In the absence of that, on a simple CW rig a limiter followed by a hypermite type filter is a very good alternative.  The filter removes the nasty harmonics from the limiter and the result is a pleasing audio even when the signal is limited.

Joe

On Fri, Jan 3, 2020 at 7:57 PM <dl2arl@...> wrote:
Hello Steven, Hello Group,
this posting is GREAT NEWS! But please be aware that for a kit to fit them all out there you might imperatively need some impedance setting device to fit for the headphone used and also for the desired AGC Kick-In Point to acommodate loud or quiet environements . There are many types of headphones out there and it is not said that the expensive ones are better, but they differ very much in what their impedance is concerned. So adapting the AGC for one specific headset will inevitably lead to malfunction with another one having an impedance ten-fold bigger or smaller.

These are only details! I think the sourcing of this AGC chip is a big step forward and rigs made for rough portable  use absolutely need one. They need one so desperately, that I seriously think of retro-fitting some of my MTR and ATS rigs with such an AGC.

On the other hand, I am happy to own one fabulous Rig, the SST, that has one of the simplest and most genial audio solution that I can think of, No! I do not ignore the difference between a limiter (that is what the SST has) and a full grown-up AGC, but I try to humbly express my enthusiasm for the simple and efficient solution the SST has. I also do not ignore the difference between an AGC solution working in the audio frequency stage (much more prone to "plopping") and one looping back as far as the Intermediate Frequency or even the front end. But let us keep it simple.

Wish you all a Happy New Year!
73 de Razvan DL2ARL

Re: Compander AGC

steve_wg0at
 
Edited

Still have my SST ...it's one of my favorite mono band SOTA rigs
...just love the sound of it (AGC?) and it's sharp xtal filter!
Great field OPs radio! ...73, Steve/wGOAT

Re: Compander AGC

Reed White
 

Earphones have different sensitivities, so if using with an AGC, it would be good to have a tiny screw-adjusted pot on the circuit board to match the earphones.

... Reed K7FLY

--
Reed White, reed@..., 719-695-0880

Re: Compander AGC

dl2arl@...
 

Hello Steven, Hello Group,
this posting is GREAT NEWS! But please be aware that for a kit to fit them all out there you might imperatively need some impedance setting device to fit for the headphone used and also for the desired AGC Kick-In Point to acommodate loud or quiet environements . There are many types of headphones out there and it is not said that the expensive ones are better, but they differ very much in what their impedance is concerned. So adapting the AGC for one specific headset will inevitably lead to malfunction with another one having an impedance ten-fold bigger or smaller.

These are only details! I think the sourcing of this AGC chip is a big step forward and rigs made for rough portable  use absolutely need one. They need one so desperately, that I seriously think of retro-fitting some of my MTR and ATS rigs with such an AGC.

On the other hand, I am happy to own one fabulous Rig, the SST, that has one of the simplest and most genial audio solution that I can think of, No! I do not ignore the difference between a limiter (that is what the SST has) and a full grown-up AGC, but I try to humbly express my enthusiasm for the simple and efficient solution the SST has. I also do not ignore the difference between an AGC solution working in the audio frequency stage (much more prone to "plopping") and one looping back as far as the Intermediate Frequency or even the front end. But let us keep it simple.

Wish you all a Happy New Year!
73 de Razvan DL2ARL

Re: BlinkySWR progress

David Perry <bumbledp@...>
 

"If we source all the parts, the kit price will go up, but at the end of the day the total price will be much lower than if one has to source the parts himself. That is the main motivation to try to come up with something more complicated than the bare bones board."


Good enough reason to go with the biggest kit you can reasonably make.  Even 20 currency units is reasonable I think and that's at your high end.

David G4YVM 

Re: BlinkySWR progress

Vojtech Bubnik
 

I had a discussion with Dan OK1HRA (owner of  https://remoteqth.com/ by the way) yesterday, who is doing the PCB artwork. I brought the prototypes of tuners and the parts for the various tuner configurations to shuffle them around our current board prototype to get an idea of physical dimensions and layout. We will most likely build an initial run of 50 pieces of the bare bore board (RF input, RF output, no switches, no ATU), and 50 pieces of some form of ATU, likely the variant 2 (ferrite UNUN) with the option to provide your coil and polyvaricon if you want to populate it as a resonant tuner.

I would go with just the bare bones board if it was not for the price of shipping and the multiple sources that the parts need to be shipped from (and paid for the shipping) to source all parts for a full tuner. If we source all the parts, the kit price will go up, but at the end of the day the total price will be much lower than if one has to source the parts himself. That is the main motivation to try to come up with something more complicated than the bare bones board.

Let's see what Dan comes up with.

73, Vojtech OK1IAK

Re: BlinkySWR progress

David Perry <bumbledp@...>
 

Option 1 is fine but I'd probably like option 2.  I'll buy whichever option because it sounds good.

David G4YVM 

Re: Compander AGC

WA0ITP
 

Awesome news!! Great design feature imho.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 12/30/2019 10:33 PM, Steven Weber wrote:

Well, it seems I can make this compander chip do the job after all. I increased the gain up stream and put a 220 ohm resistor in series with the headphones. The AGC kicks in at about 50 uV, a S9 signal. The 220 ohm resistor limits the volume to a reasonable level.

 

So, it looks like I can eliminate the volume control all together and the LM386 amp.

 

Steve KD1JV

 

 


Re: BlinkySWR progress

k5dez@...
 

For sure, Option 1 for me. Sounds perfect.
Tim - K5DEZ

Re: BlinkySWR progress

Greg DL3GJ
 

Hi Vojtech, I can just second what Warren wrote - the option one would give the most to existing solutions. ...of course all-inclusive replacement sounds also interesting - but as the design is provided, one can think about sourcing it on its own and homebrewing...

Vy 73 Greg DL3GJ