Author Topic: R27 receiver  (Read 32911 times)

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Offline Lazarus

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Re: R27 receiver
« Reply #15 on: June 27, 2013, 09:25:24 PM »
I know you hated that.  But like you d\said, got to eat.

ok, that signal is nasty looking. I post what I see on the Tek 2235 and the DSO
The first is the DSO. Sorry for the super imposed image of me taking the pic. I dont have the lap top out here do could not send file to it. And main pc too far away.

Second is the Tek.Set at 50 Mu per Div and .1 Ms per Div
well the one on the DSO looks clean enough to me, looks like i can see a little of the VFO fundumental riding on it, but it looks supressed enough, the other scope looks a little out of sync to me,

is that the output of the 1st mixer? looks like the freq says 25.something, can't make it out for sure,

and if it is, does the freq change with the VFO as it should?,

:)

Offline The Radio Shop

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Re: R27 receiver
« Reply #16 on: June 27, 2013, 09:35:27 PM »
I never could get a good waveform on the 2235. The DSO did pretty good though. The frequency on the DSO was reading 29 to 30. Tomorrow I get some screenshot pics from the PC osciloscope funtion You will be able to read every thing and I will take a shot every few seconds so you see the changes.  I like the built in FC in the DSO.
Buddy kc4umo

Offline Lazarus

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Re: R27 receiver
« Reply #17 on: June 27, 2013, 09:38:17 PM »
I never could get a good waveform on the 2235. The DSO did pretty good though. The frequency on the DSO was reading 29 to 30. Tomorrow I get some screenshot pics from the PC osciloscope funtion You will be able to read every thing and I will take a shot every few seconds so you see the changes.  I like the built in FC in the DSO.
ok at what point was this signal taken from? thats what i'm still not sure of,

oh and yeah man i love my DSO i would be lost without it, mine has a USB stick port so i can save a display pic to a flash drive, i really like that feature,

:)

Offline The Radio Shop

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Re: R27 receiver
« Reply #18 on: June 27, 2013, 09:48:08 PM »
Sorry, yes that was the output of the 1st mixer. but cant remember which side of the cap I took it from lol. Think it was between the output and the cap going to the 2nd mixer.
I am a bit tired lol.

I dont think mine will alow me to save to my flash drive. When I stick the drive in the usb it does not come on.
Buddy kc4umo

Offline Lazarus

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Re: R27 receiver
« Reply #19 on: June 27, 2013, 10:04:16 PM »
which DSO is it? i know you posted about it over at CBT but i don't remember,

with mine i had to format a USB stick to work with it, it had the wrong type of file system on it, i think it had to be formated with FAT32 to work with mine, tho i can't remember for sure, or maybe it was FAT 16, yup i believe that was it now that i think about it,

Offline The Radio Shop

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Re: R27 receiver
« Reply #20 on: June 27, 2013, 10:06:47 PM »
which DSO is it? i know you posted about it over at CBT but i don't remember,

with mine i had to format a USB stick to work with it, it had the wrong type of file system on it, i think it had to be formated with FAT32 to work with mine, tho i can't remember for sure, or maybe it was FAT 16, yup i believe that was it now that i think about it,

Mine is the OWON PDS 6062. Just spent 20 minutes reading in the manual and nothing noted there about the usb port on the back. Bummer
Buddy kc4umo

Offline Lazarus

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Re: R27 receiver
« Reply #21 on: June 27, 2013, 10:18:16 PM »
ok mine has the USB connector to hook it up to a computer like yours, but it also has a USB port to plug a flash drives into it as well, i just looked at your user manual and i don't think yours has the USB flash drive port on it,

its a real pita to get it to working anyway without linux to repartition the flash drive with a file system that it can use, i don't think froggy has gotten his to work with a flash drive yet, and his is just like mine, windows really limits you as time goes on, i doubt that the latest windows even has the ability to partition a flash drive, in linux its easy tho,

:)

Offline Lazarus

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Re: R27 receiver
« Reply #22 on: June 27, 2013, 10:23:33 PM »
i'm gonna get off this thing for a while and see who's on the radio, catch you tomorrow bro,

l8r :)

Offline The Radio Shop

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Re: R27 receiver
« Reply #23 on: June 27, 2013, 10:53:32 PM »
Okay bro, I fell asleep here in the chair. take care.
Buddy kc4umo

Offline The Radio Shop

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Re: R27 receiver
« Reply #24 on: June 28, 2013, 08:11:54 AM »
lets see if this works.
Again this is 1st osc output.
Buddy kc4umo

Offline Lazarus

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Re: R27 receiver
« Reply #25 on: June 28, 2013, 02:01:22 PM »
why is the scope reporting it to be 31.250Mhz instead of 31.4Mhz as it should be?

i know the frequency readout on my scope is the same as my best counter, so reckon the crystal is off frequency causing the problem,


notice the rise and fall in amplitude about every 6 to 7 cycles?? that is the VFO signal doing that,

now if you take the signal from the junction of C14 and C22 where the two signals come together, i bet the VFO signal will be easier to see there, it should cause the 31.4Mhz signal to rise and fall even more,

oh and by the way, nomad radio answered the question as to whether or not the crystal oscillator signal should be stronger than the VFO over at CBT, and i think he is correct,

:)

Offline The Radio Shop

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Re: R27 receiver
« Reply #26 on: June 28, 2013, 02:11:15 PM »
I wanted to see if you noticed that about the frequency. :)
I am going to check more on itlater today. At the moment I have to run to town and had folks in here all day.
I think nomad hit it spot on also.
back in a bit
Buddy kc4umo

Offline The Radio Shop

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Re: R27 receiver
« Reply #27 on: June 28, 2013, 04:43:54 PM »
Ok Laz.These 2 were taken at C14 and C22 juntion. First one is channel 23, second one is channel 1
Buddy kc4umo

Offline The Radio Shop

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Re: R27 receiver
« Reply #28 on: June 28, 2013, 05:06:56 PM »
Another test mate.
I have seperated the 2 oscilators. Disconnected from input.
Channel 1 on scope is at top and you will see chan 1 data connected to the 31 meg osc.

Channel 2 is on bottom.
It is connected to the 4 to 5 meg osc.
You will see channel 2 oscilator dat in second pic
Buddy kc4umo

Offline The Radio Shop

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Re: R27 receiver
« Reply #29 on: June 28, 2013, 05:07:56 PM »
Now tell me,
What do you see? :D
Buddy kc4umo