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Re: Slop Bucket manual

ajparent1/kb1gmx
 

Another note...

Page 23 transmit mode...

"The mic input also becomes active in CW mode as there is no way
to keep it turned off independently based on mode. If a mic is connected in CW mode, there could be some audio modulation."

Can Q17 be enabled for CW TX as well as RX to disable microphone audio?  Its a code change to add that.


Allison/KB1GMX


Re: Slop Bucket manual

ajparent1/kb1gmx
 

suggested code change..

This looks like the transmit in CW routine.

void CW_transmit(){
digitalWrite(MUTE, LOW);   // should this be high for CW TX (mute the mic)
si5351bx_setfreq(1, IFfreq_CW);
    if (ritflag == 1){si5351bx_setfreq(0,RITtemp1);}
digitalWrite(TXEN, HIGH);
digitalWrite(CWTX, HIGH);
tone(13, 600);
do delay(2);
 
    rest of code not here...


Re: Slop Bucket manual

Steven Weber
 

I didn’t do a full page schematic since it won’t all fit on an A sized drawing unless I start shrinking it symbols.

 

Steve

 

 

The three section schematics are in the manual.  Just not the full all on one 8.5x11 schematic.
I think I have it at home out of the zip file but your copy is official.


Allison/KB1GMX

 


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Re: Slop Bucket manual

Steven Weber
 

If you do make any changes to the Sketch, we  found out you have to use the Arduino IDE version 1.6.5 to compile.  If you use the latest version 1.8.5, it screws up the timers some how and nothing works right. This goes for the Soda Pop too.

 

Just spent 2 full days trying to figure this out.

 

Steve KD1JV

 

suggested code change..

This looks like the transmit in CW routine.

void CW_transmit(){

digitalWrite(MUTE, LOW);   // should this be high for CW TX (mute the mic)

si5351bx_setfreq(1, IFfreq_CW);

    if (ritflag == 1){si5351bx_setfreq(0,RITtemp1);}

digitalWrite(TXEN, HIGH);

digitalWrite(CWTX, HIGH);

tone(13, 600);

do delay(2);

 

    rest of code not here...

 


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Re: Slop Bucket manual

 

With newer versions, variables used in interrupt routines need to be declared as volatile (noted by Camil).
I've also seen issues with  typing of ints.
I don't know if either are what you're seeing.


On 2/26/2018 2:26 PM, Steven Weber wrote:

If you do make any changes to the Sketch, we  found out you have to use the Arduino IDE version 1.6.5 to compile.  If you use the latest version 1.8.5, it screws up the timers some how and nothing works right. This goes for the Soda Pop too.

 

Just spent 2 full days trying to figure this out.

 

Steve KD1JV

 

suggested code change..

This looks like the transmit in CW routine.

void CW_transmit(){

digitalWrite(MUTE, LOW);   // should this be high for CW TX (mute the mic)

si5351bx_setfreq(1, IFfreq_CW);

    if (ritflag == 1){si5351bx_setfreq(0,RITtemp1);}

digitalWrite(TXEN, HIGH);

digitalWrite(CWTX, HIGH);

tone(13, 600);

do delay(2);

 

    rest of code not here...

 


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-- 
John Sutter
W1JDS CM87xi


Re: Slop Bucket manual

Steven Weber
 

That was it John, I failed to declare a couple of variables as volatile. IDE 1.6.5 apparently didn't care, but IDE 1.8.5 did. I've uploaded the corrected file. 


Re: Slop Bucket manual

Trevor Jacobs, K6ESE
 

Steve,

Did you fix the Soda Pop file as well? That's awesome that it was something simple!

73 es God bless de Trev K6ESE

On 2/26/2018 8:00 PM, Steven Weber wrote:
That was it John, I failed to declare a couple of variables as volatile. IDE 1.6.5 apparently didn't care, but IDE 1.8.5 did. I've uploaded the corrected file. 


Re: Slop Bucket manual

ajparent1/kb1gmx
 

John, thanks.

You confirmed what I hand't tested.  I've done some Arduino code but my more routine compiler is SDCC
on older school chips.

I was walking the code in an editor and had concerns about that but hadn't fed a dime to the compiler to see it.
However... There are a lot of other sketches out there that have the same issues.  We need lint for the files
to find fluff like that.  I used to crank C when not using  Macro-11 on a PDP-11/34 way back when.

Allison/KB1GMX


40m slop bucket

Kelly Jack
 

So there are no specs set out for other versions but the code suggests that other bands can be catered for or were contemplated.

So LPF, the BPF after the tx mixer and the receiver input BPF would need modification. And some code. Anything else? And the code says to use a different IF so different filter crystals etc but why not use 9mhz like all the other bands?

Also, any reason why one of the display lines not already with dual purpose couldn't be used for a second keyer input to run a paddle/keyer?

Regards


Simon


Re: 40m slop bucket

Steven Weber
 

9 MHz is too close to 7 MHz to effectively filter out along with several other mixing spurs which fall close to the desired Tx frequency. Using a 11.058 MHz IF made the output much cleaner (which is why it’s important to have a spectrum analyzer to find these things out). I may try 9 MHz again and see if I can clean it up, but my first attempts weren’t promising.

 

I have filter values for 40M, but haven’t tried to figure out values for the other bands yet.

 

The multiplexing of the display/switch inputs might be fast enough to so that a keyer wouldn’t end up being too choppy. The main issue is the enable line which would have to run dwon the cable down to the paddle common. This would have to be isolated from ground and the length and capacitance of the cable could affect proper reading of the bus. Could have to make the enable pulse much longer.  Or maybe buffer it some how.

 

 

So there are no specs set out for other versions but the code suggests that other bands can be catered for or were contemplated.

So LPF, the BPF after the tx mixer and the receiver input BPF would need modification. And some code. Anything else? And the code says to use a different IF so different filter crystals etc but why not use 9mhz like all the other bands?

Also, any reason why one of the display lines not already with dual purpose couldn't be used for a second keyer input to run a paddle/keyer?

Regards


Simon

 


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Re: 40m slop bucket

ajparent1/kb1gmx
 

It depends if the LO is on the high side or the low side.  High side is prefered.
Also if the 612 mixer is over driven you get more spurs.

The bandpass filters need to have an asymmetrical bandpass with a
sharper drop on the high side.   Baring that narrower filters.

I have several radios with 9mhz if, Tempo-one, my Argonaut 505
and Eagle 599 is in the bunch.  They are clean on 40 but they have 
filter and selective stages to  assure that.

For this radio a filter in the 11-12mhz range is likely better for 40 and down. 
I've tried that using 11.000 mhz crystals and for 40M it works well as did 12mhz.
Also 10 or 10.xxx should work

Depending on the LO and IF the BFO may have to be on the other side.

Allison


Re: 40m slop bucket

Kelly Jack
 

Thanks Steve and Allison.

Will read EMRFD to see if I can find anything about what caps to use in the filter with 11.059mhz crystals.

Steve, are you going to publish the filter values?

Regards



Simon


Re: 40m slop bucket

Steven Weber
 

47P caps seem to work well for the 11.059 MHz crystals.

 

I’ll have to try and remember where I wrote down the Tx mixer filter values. If I did at all.

Steve

 

 

Thanks Steve and Allison.

Will read EMRFD to see if I can find anything about what caps to use in the filter with 11.059mhz crystals.

Steve, are you going to publish the filter values?

Regards



Simon

 


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Re: 40m slop bucket

ajparent1/kb1gmx
 

For the RF filters its not hard to work them out if you know the end point termination values.
ELSIE or other filter design program can do that.  You start with the existing design and 
terminate it with "eyeball values" and see if it works then scale to 7mhz and tweek it some.

The 11.059 crystal filter 47pf is a ball park value as it varies with crystal vendor and style of case. 
To do that right you need to match the crystals to within less than 100hz.  The process to do
that is not hard even with limited tools.   EMRFD give a procedure that works.  However,
if you match the crystals and go with 47pf it will make a functional filter with an approximate
2.7khz bandwidth.

In the last 18 years i've built 9 SSB radios for various bands all but 2 (KNQ7A and WM20)
from my designs to try things.  Crystal filters are easy to build once you done the first one
as its all about testing and once you created a test set its easier to get the data to make
a good one.

Allison/KB1GMX


Re: 40m slop bucket

Kelly Jack
 

Thanks Allison and Steve,

I'm new at this so having a go.  Does this look right for the receiver input filter:



Assumptions made here:
Load impedance is 1500ohms (SA612A input impedance).
Source impedance is set by R21 at 51ohms.

Values of the variable caps were tuned in ELSIE to peak the output at about 14.1M.
Insertion loss was 1db at peak.
3db bandwidth was 2.3MHz.

Does this seem right?

I've gone on to tweak values to get for 40M by doubling the fixed cap and inductor values to the nearest standard values and then tweaking the variable caps to peak 7.1Mhz with similar looking results in terms of insertion and relative bandwidth (ie about 1.2Mhz at 3db down).

I'm trying to understand what is going on in this filter:

The LC network of L4 and CT1 does the bulk of the impedance matching between the source 50 ohms and the load 1500 ohms with L5 and CT2 doing most of the passband work.  C34 and C41 act as coupling between the three main stages of source, resonant tank filter and load but I presume interact with reactive components on either side of them to cut out some lower frequencies. These added reactances are offset by impedances "left over" from the inductors by adjusting CT1 and CT2.  Hardly scientific, I know.  L4 and CT1 also acts as a low pass filter with rolloff at 14.8MHz (using the values above).  Passband characteristics are enhanced by the low pass filter of L4 and CT1 and the high pass networks that C34 and C41 form with components of L4 and L5.

Any feedback on my dilettantish thinking would be greatly appreciated.

Regards




Simon






















Re: 40m slop bucket

Kelly Jack
 

Are the values in the schematic for L1 and C21 correct?

They don't seem to line up with the parts list (there are no 8.2uH inductors and only one 15pf cap and there is one in the LPF as well as C21 being listed as 15pf in the schematic).

Also the bandpass profile did not look right at all with schematic values plugged in.  But the with 4.7uH for L1 and 22pf for C21, it looks OK.

Regards


Simon


Re: 40m slop bucket

Steven Weber
 

When ever there is any conflict with the schematic, the parts layout diagram is always correct and should be used as the reference.

 

The schematic often uses cut and past sections from other schematics and I sometimes forget to change all the values.

 

Steve KD1JV

 

Are the values in the schematic for L1 and C21 correct?

They don't seem to line up with the parts list (there are no 8.2uH inductors and only one 15pf cap and there is one in the LPF as well as C21 being listed as 15pf in the schematic).

Also the bandpass profile did not look right at all with schematic values plugged in.  But the with 4.7uH for L1 and 22pf for C21, it looks OK.

Regards


Simon

 


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MTR5B SOTA Station

W3DX
 

Hi Guys-

i thought I would post photos of my MTR5B SOTA Station inspired by an article written by K1JD:

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxrMWpkc290YXN0YXRpb25ldm9sdXRpb258Z3g6MmZjNWNiNWM0ODJlZGZiZg

The MTR5B is built into a Pelican Micro 1020 case that doubles as a clipboard for a log. The rig includes earphones, battery, and paddles.

The SOTA Station is not quite waterproof because of the center conductor of the BNC, but it’s shock resistant and very water resistant.

73,

Rob, W3DX



Slop Bucket manual addendum

Steven Weber
 

I made a couple of minor corrections to the manual.
If you find anything else, use this thread to let us know about it.

Page 8 - added C13/35/39 to list of caps not used.
Page 13 - The call out box showing the input filter mod incorrectly says to jumper to C35, it should be C39. The jumper is show going to the correct location.
On the PA section of the schematic, the correct value of L1 is now shown (4.7 uh)

Steve KD1JV  


sn23 built and working

ajparent1/kb1gmx
 

Finished testing the unit and had it on the air.  Still have to package it.

hears down under .3uv.  I'm seeing 4W CW and nearly 4.3 watts single tone
at 13.2V.

Had to adjust the BFO about 100hz lower or I was described as squeeky.

Mine th Zener supplied was not 5.1V but 3.6 and the number on the part matches 3.6.
I had some in the parts stock as the 3.6V part would not allow more than 10ma idle 
current on the final.  Mine seems to like about 60ma idle.

I found the audio a bit tepid so between pins 1 and 8 of the L386 there is a 
680ohm and a 10uf cap.  That increases the gain some.

On to putting it in a box.

Assembly mods will include a small toggle for the VOX enable.

Allison/kb1gmx