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Carriers everywhere

Joe Puma
 

I’ve been noticing that as I tune around on the ubitx I hear my uhf/vhf Radio’s breaking squelch. Today I took a look and see the carrier.

At 3.555.4 I see a carrier at 145.640.

Without the antenna connected to the uBitx and checking from antennas on the roof. My SDR shows a signal of 4 S units. And the uhf/vhf radio was practically full bars. The signal is full quieting.

If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?

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Laurence Oberman
 

Wow, Joe, When I tested I was only looking at 1 to 30Mhz for the spurs
and harmonics.
Will have to look at maybe a 1 to 500Mhz span.

Thanks for sharing
Laurence

On Sat, Mar 23, 2019 at 6:24 PM Joe Puma <kd2nfc@...> wrote:

I’ve been noticing that as I tune around on the ubitx I hear my uhf/vhf Radio’s breaking squelch. Today I took a look and see the carrier.

At 3.555.4 I see a carrier at 145.640.

Without the antenna connected to the uBitx and checking from antennas on the roof. My SDR shows a signal of 4 S units. And the uhf/vhf radio was practically full bars. The signal is full quieting.

If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?
 

Any digital electronics sitting out on the desk has square waves with lots of harmonics.
The cure is shielding.

I'm not really concerned till somebody finds that it's going out the antenna port.
And has taken measurements determining that it exceeds regs.

Jerry, KE7ER



On Sat, Mar 23, 2019 at 03:24 PM, Joe Puma wrote:
If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?
Joe Puma
 

开云体育

Yes, I see it does not seem to go out over antenna. I disconnected the antenna and didn’t notice a change. but the radunio plugged into the board still gives the carrier some umph!. What could I shield, the raduino??



Joe


On Mar 23, 2019, at 9:16 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Any digital electronics sitting out on the desk has square waves with lots of harmonics.
The cure is shielding.

I'm not really concerned till somebody finds that it's going out the antenna port.
And has taken measurements determining that it exceeds regs.

Jerry, KE7ER



On Sat, Mar 23, 2019 at 03:24 PM, Joe Puma wrote:
If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?
Gordon Gibby
 

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?Shield the entire radio!!!? ?And then perhaps shield different sections from each other.? ?


on my ancient heathkits, they had aluminum shielding between a bunch of different sections of the transmitter.? ? Huge bandswitching rotary systems penetrated each shield to switch wavers in every compartment.? ??


Cheers,


gordon



From: [email protected] <[email protected]> on behalf of Joe Puma <kd2nfc@...>
Sent: Saturday, March 23, 2019 9:31 PM
To: [email protected]
Subject: Re: [BITX20] Carriers everywhere
?
Yes, I see it does not seem to go out over antenna. I disconnected the antenna and didn’t notice a change. but the radunio plugged into the board still gives the carrier some umph!. What could I shield, the raduino??



Joe


On Mar 23, 2019, at 9:16 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Any digital electronics sitting out on the desk has square waves with lots of harmonics.
The cure is shielding.

I'm not really concerned till somebody finds that it's going out the antenna port.
And has taken measurements determining that it exceeds regs.

Jerry, KE7ER



On Sat, Mar 23, 2019 at 03:24 PM, Joe Puma wrote:
If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?
Joe Puma
 

开云体育

Got it. I imaged doing that with pieces of tin or other metal scraps you can form into housings. I've been shielding cables with great results.?

Bring on the NASA gold foil



Joe
KD2NFC



On Mar 23, 2019, at 9:32 PM, Gordon Gibby <ggibby@...> wrote:

?Shield the entire radio!!!? ?And then perhaps shield different sections from each other.? ?

on my ancient heathkits, they had aluminum shielding between a bunch of different sections of the transmitter.? ? Huge bandswitching rotary systems penetrated each shield to switch wavers in every compartment.? ??

Cheers,

gordon


From:?[email protected]?<[email protected]> on behalf of Joe Puma <kd2nfc@...>
Sent:?Saturday, March 23, 2019 9:31 PM
To:?[email protected]
Subject:?Re: [BITX20] Carriers everywhere
?
Yes, I see it does not seem to go out over antenna. I disconnected the antenna and didn’t notice a change. but the radunio plugged into the board still gives the carrier some umph!. What could I shield, the raduino??



Joe


On Mar 23, 2019, at 9:16 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Any digital electronics sitting out on the desk has square waves with lots of harmonics.
The cure is shielding.

I'm not really concerned till somebody finds that it's going out the antenna port.
And has taken measurements determining that it exceeds regs.

Jerry, KE7ER



On Sat, Mar 23, 2019 at 03:24 PM, Joe Puma wrote:
If I unplug the raduino from the radio and power from usb the carrier drops significantly, but still there. That’s some strong clock signal there. Anyway to filter it from above 30mhz?

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