Date   

Re: Multi-Use Radio DXing Kit - June 2021

Paul Blundell
 

It is always interesting to hear about the different radio services from over "your side of the world", here we have 27MHz CB and a UHF CB service which is 80 channels around 477MHz.


On Wed, Jun 9, 2021 at 2:23 AM Peter Laws <plaws0@...> wrote:
Lol!  Unrelated to your topic, the Subject: line made me do a triple
take!  In the USA, Part 95 of the FCC's rules include several
"personal" radio services.  27-MHz CB is one, UHF GMRS is another, UHF
FRS (taken from GMRS and license-by-rule like CB), and a couple
others.  In one of the FCC's periodic episodes of "we don't want to
enforce the rules, but we are happy to change them to prevent us
having to do that" they created a new service at VHF.

They took 5 frequencies in the 150-MHz range where vendors had been
selling utility radios for decades with only the briefest mention of
an FCC license -- think "blue dot" and "green dot" -- and created a
new sub-part ("J") under Part 95 and called it the Multi-Use Radio
Service.  Like CB and FRS, it, too, is licensed by rule.

So when I saw your subject, I assumed you were DXing on VHF ... it's
Sporadic E season on the northern half of the planet at least, so
until I looked at your message this all made complete sense.  :-D



--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!







--
Paul


Re: Multi-Use Radio DXing Kit - June 2021

Peter Laws
 

Lol! Unrelated to your topic, the Subject: line made me do a triple
take! In the USA, Part 95 of the FCC's rules include several
"personal" radio services. 27-MHz CB is one, UHF GMRS is another, UHF
FRS (taken from GMRS and license-by-rule like CB), and a couple
others. In one of the FCC's periodic episodes of "we don't want to
enforce the rules, but we are happy to change them to prevent us
having to do that" they created a new service at VHF.

They took 5 frequencies in the 150-MHz range where vendors had been
selling utility radios for decades with only the briefest mention of
an FCC license -- think "blue dot" and "green dot" -- and created a
new sub-part ("J") under Part 95 and called it the Multi-Use Radio
Service. Like CB and FRS, it, too, is licensed by rule.

So when I saw your subject, I assumed you were DXing on VHF ... it's
Sporadic E season on the northern half of the planet at least, so
until I looked at your message this all made complete sense. :-D



--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!


Re: Common Interference Sources

radiojayallen
 

Motion detector lights are a big offender. I had to replace a garage door opened because the motion detector light wiped out almost all AM and SW through the entire house, although usually it is a bit less severe than that. In my new house, several appliances are RF noisy...my washing machine makes RFI but luckily only while it is running.

I also once had a very odd RFI issue that was very hard to find.. After turning off circuit breakers I knew which circuit the culprit was on, but after turning the breaker off then back on again the noise wouldn't come back for anywhere from an hour to a day. It turned out to be an audio processor (a DBX 119) which was plugged into an outlet strip...either item alone was OK but when plugged in together they created noise. I got rid of both since I no longer trusted them.


Re: Sangean DT-250 ULR Receiver

Jorge Garzón
 

I guess both are the same with different names. Here, DT-250 can just be bought in silver colour. 


Re: Common Interference Sources

Paul Blundell
 

Good question Andy and not something I have seen here (Australia). I do wonder what "standard" they use to be able to claim this?

Paul

On Tue, Jun 8, 2021 at 12:53 PM Andy - Arlington TX <andy.j1s@...> wrote:
The Home Depot website lets you search for LED light bulbs with the feature "No Electromagnetic Interference".

Does anybody know if that makes a difference for radio reception?

Is there a legal standard for being able to claim that?

By far and away, most of them are Phillips brand (121), then Hy-Lite (41), then a couple more brands with 1 each.

-- Andy - Arlington TX



--
Paul


Multi-Use Radio DXing Kit - June 2021

Paul Blundell
 

I have recently updated and improved my "Ultralight Radio DXing Go Case". As my radio collection has increased, I have needed to find a suitable way to carry my radios while still providing them with a good level of protection. As I am also taking my "daily carry" kit with me more, I was struggling to keep all of this together and to easily have a way to split it when needed.
 
I ended up placing my 3" FSL at one end and using a piece of pine to divide this off, to the top of this I have attached a small piece of foam wrap, this goes over the top of my 3" FSL and provides some extra protection to this. I have also added some foam to the bottom of this section to keep it in place.
 
On the left hand side, I have added some dividers to keep my radios in place, this is thick cardboard which has had foam added and then has been wrapped in duct tape, this is about the best tradeoff I could make for weight / protection. I also have my earphones, spare batteries, log sheets and notebook on this side. I have also added a space for my "daily carry" radio case which is a small plastic clip seal container which stores my Digitech AR-1733 plus headphones and spare batteries. This setup provides the best of both worlds, I can grab and go my whole ultralight radio DXing case 
 
Overall, I am very pleased with how well this case has come out, I am able to carry and store multiple radios, log sheets, pens, notes, spare batteries and ear phones, everything I need for portable sessions. It is also small enough to fit in my backpack. For $30 it provides a great level of protection. The best feature is that I can now easily split my kit, taking either the whole kit or just my "daily carry" kit if that is all I want to carry.
 
While this case was designed for ultralight DXing the same ideas could be used for amateur radio, radio scanning or any other radio storage need.
 
Photos: https://ultralightradiodxing.blogspot.com/2021/06/multi-use-radio-dxing-kit-june-2021.html


Re: Common Interference Sources

Andy - Arlington TX
 

The Home Depot website lets you search for LED light bulbs with the feature "No Electromagnetic Interference".

Does anybody know if that makes a difference for radio reception?

Is there a legal standard for being able to claim that?

By far and away, most of them are Phillips brand (121), then Hy-Lite (41), then a couple more brands with 1 each.

-- Andy - Arlington TX


Re: Common Interference Sources

Paul Blundell
 

The below is an NBN NTD device, from my testing last night it seems that this might be part of the issue, it will need me to look in to it further.

Paul



Long Term DX Project - 07/06/2021

Paul Blundell
 

-------------------------
**MWDxerDB - Report**
Report Date: 06/08/2021
Report Time: 10:50:28

Details: 07/06/2021 - 23:00 / Home, Launceston Tasmania. 
Notes: Radio: Digitech AR-1733 / Aerial: Internal. A night time session at home. This session was later than the night before and as such the band was generally performing better. Both HPON stations hit the highest signal levels. Again the 50kw big guns also performed very well.

Freq / Name: 00531 - 3GG
Details: Warragul - Commercial - 5KW 
Notes: 07/06/2021 - 5

Freq / Name: 00549 - 2CR
Details: Cumnock - National - 50KW 
Notes: 07/06/2021 - 5

Freq / Name: 00594 - 3WV
Details: Horsham - National - 50KW 
Notes: 07/06/2021 - 5

Freq / Name: 00621 - 3RN
Details: Melbourne - National - 50KW 
Notes: 07/06/2021 - 5

Freq / Name: 00774 - 3LO
Details: Melbourne - National - 50KW 
Notes: 07/06/2021 - 5

Freq / Name: 01053 - 2CA
Details: Canberra - Commercial - 5KW 
Notes: 07/06/2021 - 4

Freq / Name: 01179 - 3RPH
Details: Melbourne - Community - 5KW 
Notes: 07/06/2021 - 4

Freq / Name: 01341 - HPON GEELONG
Details: Geelong - HPON - 5KW
Notes: 07/06/2021 - 5

Freq / Name: 01422 - HPON MELBOURNE
Details: Melbourne - HPON - 5KW
Notes: 07/06/2021 - 5

Freq / Name: 01503 - 3KND
Details: Melbourne - Community - 5KW 
Notes: 07/06/2021 - 3


Re: Common Interference Sources

Paul Blundell
 

Thanks for the great list, I will start checking them each out.

Paul

On Tue, Jun 8, 2021 at 10:18 AM Gavin <gwatersvic@...> wrote:
Chargers getting worse? Yes, the cheap ones.
Allegedly they make them cheaper without RF suppression but even those with it are not good.

The list is long but for example unplug to see if a difference
- touch on/off bedside lamps
- phone chargers
- PC power supplies
- other appliance external power supplies
- appliances generally if they convert down voltage inside
- fluorescent lights and bad starters
- LED lights and light bulbs
- Wall switches for light dimmers
- Stick vac power chargers
- Wall warts of all descriptions especially if not transformer based
- security proximity lights
- security camera system and wifi cameras
- deck lighting
- electric operated shutters and blinds
- cordless tool chargers
- the list goes on.

Then, there's the neighbour's devices especially if you have an outside aerial.



--
Paul


Re: Common Interference Sources

Paul Blundell
 

A lot of houses (including ours) have had new power meters installed lately, I wonder if that might also be a part of it.

Paul

On Tue, Jun 8, 2021 at 4:05 AM Paul S. in CT <dxrx@...> wrote:
If its not in the house, the neighbor's electric dog fence and intrusion detection (motion detector/burgalar alarm/tresspass detector) top the short list. The latter affects me at home. When the neighbor leaves for the weekends, the AM is unlistenable between 1000-1200kHz. Most of the time though, its a blup-blip-blip thats quieter. Rare, but local to me, is the NatGas pipeline transponder... nasty in the same bandwidth as above.

Paul S. in CT FN31nl







--
Paul


Re: Common Interference Sources

Paul Blundell
 

I also do the same for "my" stuff but it is harder to get the rest of the family to do it...

Paul

On Tue, Jun 8, 2021 at 3:54 AM Paul S. in CT <dxrx@...> wrote:
In general I unplug ALL chargers when not in use, along with the toaster, microwave, and coffee pot. This will save some $ on the electric bill, too!

Paul S. in CT FN31nl







--
Paul


Re: Common Interference Sources

Paul Blundell
 

Thanks Dave, we do have a touch lamp but this is at the other end of the house. I will keep it in mind.

Paul

On Tue, Jun 8, 2021 at 1:16 AM Dave Hascall <dhinfomedia@...> wrote:
Hi Paul.  If turning the main breaker off silences the noise, I then turn it back on and kill each circuit, breaker by breaker until I determine what circuit the culprit is on.  A touch lamp was the biggest offender.

73
Dave in Indy (Noblesville) 



--
Paul


Re: Common Interference Sources

Gavin
 

Chargers getting worse? Yes, the cheap ones.
Allegedly they make them cheaper without RF suppression but even those with it are not good.

The list is long but for example unplug to see if a difference
- touch on/off bedside lamps
- phone chargers
- PC power supplies
- other appliance external power supplies
- appliances generally if they convert down voltage inside
- fluorescent lights and bad starters
- LED lights and light bulbs
- Wall switches for light dimmers
- Stick vac power chargers
- Wall warts of all descriptions especially if not transformer based
- security proximity lights
- security camera system and wifi cameras
- deck lighting
- electric operated shutters and blinds
- cordless tool chargers
- the list goes on.

Then, there's the neighbour's devices especially if you have an outside aerial.


Re: Sangean DT-250 ULR Receiver

Michael Schuster
 

Physically looks very much like the receiver sold in the Americas as the DT-200X.


Re: Common Interference Sources

Paul S. in CT
 

If its not in the house, the neighbor's electric dog fence and intrusion detection (motion detector/burgalar alarm/tresspass detector) top the short list. The latter affects me at home. When the neighbor leaves for the weekends, the AM is unlistenable between 1000-1200kHz. Most of the time though, its a blup-blip-blip thats quieter. Rare, but local to me, is the NatGas pipeline transponder... nasty in the same bandwidth as above.

Paul S. in CT FN31nl


Re: Common Interference Sources

Paul S. in CT
 

In general I unplug ALL chargers when not in use, along with the toaster, microwave, and coffee pot. This will save some $ on the electric bill, too!

Paul S. in CT FN31nl


Re: Common Interference Sources

Dave Hascall
 

Hi Paul.  If turning the main breaker off silences the noise, I then turn it back on and kill each circuit, breaker by breaker until I determine what circuit the culprit is on.  A touch lamp was the biggest offender.

73
Dave in Indy (Noblesville) 


Re: Common Interference Sources

Paul Blundell
 

Thanks Chris.

Getting the power off will require some negotiation with the other household members... I will try over the weekend to get them out of the house.

On Mon, 7 Jun 2021, 18:03 Chris Rogers, <crvee8@...> wrote:
Most plug packs and chargers are of the Chinese switch mode variety which are a big source of RFI. The best way to isolate noise is to tune to the noise on your radio turn all your appliances (everything) off in the house and turn to power off at the meter box. If the interference is gone turn the power back on and gradually turn appliances back on one at a time until you find the source. There could be multiple sources in the house. If the interference is still there when all the power is off in the house it must be coming in externally to the house, a neighbour or a power line etc. The majority of times it will be something in your house.


Re: Common Interference Sources

Chris Rogers
 
Edited

Most plug packs and chargers are of the Chinese switch mode variety which are a big source of RFI. The best way to isolate noise is to tune to the noise on your radio turn all your appliances (everything) off in the house and turn the power off at the meter box. If the interference is gone, turn the power back on and gradually turn appliances back on one at a time until you find the source. There could be multiple sources in the house. If the interference is still there when all the power is off in the house it must be coming in externally to the house, a neighbour or a power line etc. The majority of times it will be something in your house.

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