Date   

Re: 891 AUS 5AN ABC Adelaide 10289km

Peter 1956
 

Thanks Paul


Re: "Supercharging the XHDATA D-808" construction suggestion

Paul Blundell
 

I did have one of mine break off, but that was after it was dropped inside it's carry case.


On Sun, 10 Oct 2021, 9:12 am Gary DeBock via groups.io, <D1028Gary=aol.com@groups.io> wrote:
On Sat, Oct 9, 2021 at 01:17 PM, Zack N8FNR wrote:
I would like to make a suggestion for something to add to your "Supercharging the XHDATA D-808" instructions. If one sands down the top of the radio where the glue will go and also the bottom of the level the glue will work a lot better. Glue will adhere to a rough surface a lot better than a smooth one. I would use a very rough sandpaper so that there are deep scratches.

Zack
N8FNR
Thanks for your suggestion, Zack.

This is certainly a judgement call, because the tricky part is deciding how much sanding is too much, and the orange plastic carpenter's level surface isn't perfectly smooth as it comes from the factory. Probably the only way to answer the question is to judge from glue joint survival out in the field, and that was the standard used in the assembly instructions. Out of about 25 loopstick frames superglued to portable radios I have never had one break off at the glue joint, unless the modified radio was dropped on solid concrete from about 5 feet high. There are a couple of practices that will make the glue joint stronger, however. It's best to have completely clean surfaces before gluing, and also use a generous amount of superglue, up to the point where it will still not show on the finished model, and will not stop the rear cabinet from closing properly.

Gary DeBock (in Puyallup, WA, USA)

    


Re: "Supercharging the XHDATA D-808" construction suggestion

Gary DeBock
 

On Sat, Oct 9, 2021 at 01:17 PM, Zack N8FNR wrote:
I would like to make a suggestion for something to add to your "Supercharging the XHDATA D-808" instructions. If one sands down the top of the radio where the glue will go and also the bottom of the level the glue will work a lot better. Glue will adhere to a rough surface a lot better than a smooth one. I would use a very rough sandpaper so that there are deep scratches.

Zack
N8FNR
Thanks for your suggestion, Zack.

This is certainly a judgement call, because the tricky part is deciding how much sanding is too much, and the orange plastic carpenter's level surface isn't perfectly smooth as it comes from the factory. Probably the only way to answer the question is to judge from glue joint survival out in the field, and that was the standard used in the assembly instructions. Out of about 25 loopstick frames superglued to portable radios I have never had one break off at the glue joint, unless the modified radio was dropped on solid concrete from about 5 feet high. There are a couple of practices that will make the glue joint stronger, however. It's best to have completely clean surfaces before gluing, and also use a generous amount of superglue, up to the point where it will still not show on the finished model, and will not stop the rear cabinet from closing properly.

Gary DeBock (in Puyallup, WA, USA)

    


Re: 891 AUS 5AN ABC Adelaide 10289km

Paul Blundell
 

Well done Peter.


On Sun, 10 Oct 2021, 6:40 am Peter 1956, <pe1etr@...> wrote:
891 Lesotho Ultimate Radio Maseru/Lancer's Gap was off air. Received in Botswana Airspy HF+ Discovery, SDR Console V3, random wire with binocular balun.
https://youtu.be/rUddMRoRYC4

Peter
Botswana


"Supercharging the XHDATA D-808" construction suggestion

Zack N8FNR
 

I would like to make a suggestion for something to add to your "Supercharging the XHDATA D-808" instructions. If one sands down the top of the radio where the glue will go and also the bottom of the level the glue will work a lot better. Glue will adhere to a rough surface a lot better than a smooth one. I would use a very rough sandpaper so that there are deep scratches.

Zack
N8FNR


891 AUS 5AN ABC Adelaide 10289km

Peter 1956
 

891 Lesotho Ultimate Radio Maseru/Lancer's Gap was off air. Received in Botswana Airspy HF+ Discovery, SDR Console V3, random wire with binocular balun.
https://youtu.be/rUddMRoRYC4

Peter
Botswana


Re: Antenna switcher and splitter

vbifyz
 

Here is my design:
https://easyeda.com/3ym3ym/HF-antenna-splitter_copy
It is under CC license, feel free to order PCBs from JLCPCB and build it. I think it is a good beginners project to learn SMD soldering, the parts are not too small.
For MW use, don't fit the HPF parts.

73, Mike AF7KR


Long Term DXing Project - 07/10/2021

Paul Blundell
 

-------------------------
**MWDxerDB - Report**
Report Date: 10/08/2021
Report Time: 11:24:06
-------------------------

Details: 07/10/2021 -21:30 / Home, Launceston
Notes: Radio: Digitech AR-1733 / Aerial: Internal. 

Freq / Name: *0531 - 3GG
Details: Warragul - Commercial - 5000w - 384km 
Notes: 07/10/2021 - LTDXProject = 4

Freq / Name: *0549 - 2CR
Details: Cumnock - National - 50000w - 954km 
Notes: 07/10/2021 - LTDXProject = 2

Freq / Name: *0621 - 3RN
Details: Melbourne - National - 50000w - 459km 
Notes: 07/10/2021 - LTDXProject = 5

Freq / Name: *0693 - 3AW
Details: Melbourne - Commercial - 5000w - 458km
Notes: 07/10/2021 - LTDXProject = 4

Freq / Name: *0774 - 3LO
Details: Melbourne - National - 50000w - 459km 
Notes: 07/10/2021 - LTDXProject = 5

Freq / Name: *0828 - 3GI
Details: Sale - National - 10000w - 360km
Notes: 07/10/2021 - LTDXProject = 4

Freq / Name: *0855 - 3CR
Details: Melbourne - Community - 3500w - 446km 
Notes: 07/10/2021 - LTDXProject = 4

Freq / Name: *0891 - 5AN
Details: Adelaide - National - 50000w - 1030km 
Notes: 07/10/2021 - LTDXProject = 4

Freq / Name: *1341 - HPON GEELONG
Details: Geelong - HPON - 5000w - 429km
Notes: 07/10/2021 - LTDXProject = 3

Freq / Name: *1422 - HPON MELBOURNE
Details: Melbourne - HPON - 5000w - 449km
Notes: 07/10/2021 - LTDXProject = 4

 


Re: Antenna switcher and splitter

Robert Conboy
 

Anyone building their own, especially antennas, would benefit greatly from getting a NanoVNA and learning how to use it, especially the Smith chart feature. There is a learning curve to operate it, and another learning curve to interpret the measurements, but it’s well worth it, especially for those who don’t have an RF background. Best $60 I ever spent.


Re: Antenna switcher and splitter

Robert Conboy
 

The two transformer ones work better. Transformer 1 is 10 turn autotransformer tapped at turn 7. This transforms 50 Ohms to 25 Ohms. (Or 75 to 37.5). The second transformer is 14 turns center tapped.

The 25 (37.5) Ohm tap from the first transformer goes to the center tap.  The two ports are the outer ends of the second transformer.

Place a 100 Ohm (for 50 Ohm system) or 150 for 75 Ohm system across these two outer ends. This provides the isolation between these two ports.

There is only one ground connection - to the cold side of the first transformer.

Isolation and high frequency response can be improved by cancelling out the self inductance of the transformers by placing a capacitor from the center taps to ground.

For BN-73-202  ferrite cores, I arrived at 330 pF for this capacitor experimentally. See


The splitter I described is like fig. 4.


On Oct 7, 2021, at 5:48 PM, LA2PJ - Egil <egil@...> wrote:

Hi Jorge,

I built my own 2-way splitter called "BB-2" in this article:
http://www.dxing.info/equipment/rolling_your_own_bryant.dx

A couple of months later I bought a commercial 5-way splitter (ELAD ASA15).
All signal levels in the homebrew splitter was approximately half an S-unit lower than on the commercial splitter. But with the homebrew unit I'm able to read much weaker signals than I do with the commercial unit. The commercial unit has a built-in amplifier raising the noise floor.

Just one week ago I found this link:
https://www.aliexpress.com/item/4000140516245.html?spm=2114.12057483.detail.3.71be55edpi829d

The price of the chinese unit is is only 25% of what I have to pay here in Norway for the ferrite cores in the homebuilt unit above, so I ordered some of them for experiments. But they'll take another four weeks before arriving here. Looking forward to that.


73
Egil - LA2PJ







Re: Antenna switcher and splitter

LA2PJ - Egil
 

Hi Jorge,

I built my own 2-way splitter called "BB-2" in this article:
http://www.dxing.info/equipment/rolling_your_own_bryant.dx

A couple of months later I bought a commercial 5-way splitter (ELAD ASA15).
All signal levels in the homebrew splitter was approximately half an S-unit lower than on the commercial splitter. But with the homebrew unit I'm able to read much weaker signals than I do with the commercial unit. The commercial unit has a built-in amplifier raising the noise floor.

Just one week ago I found this link:
https://www.aliexpress.com/item/4000140516245.html?spm=2114.12057483.detail.3.71be55edpi829d

The price of the chinese unit is is only 25% of what I have to pay here in Norway for the ferrite cores in the homebuilt unit above, so I ordered some of them for experiments. But they'll take another four weeks before arriving here. Looking forward to that.


73
Egil - LA2PJ


Re: New TA Log from AK!

Paul B. Walker, Jr.
 

Here's the audio of Iran in Russian on 1449kHz on Mon Oct 4th from 1415UTC. Signal held out on and off, fairly well for 9 minutes


On Mon, Oct 4, 2021 at 6:22 AM Paul B. Walker, Jr. <walkerbroadcasting@...> wrote:
Pretty decent signal at times from IRIB Iran in Russian on 1449Khz at 1615-1620UTC!  First  heard here because KLAM is usually very strong!

Paul standing outside in 15 degree weather to type this!


Re: New TA Log from AK!

Paul Blundell
 

Your dedicated:)


On Tue, 5 Oct 2021, 1:22 am Paul B. Walker, Jr., <walkerbroadcasting@...> wrote:
Pretty decent signal at times from IRIB Iran in Russian on 1449Khz at 1615-1620UTC!  First  heard here because KLAM is usually very strong!

Paul standing outside in 15 degree weather to type this!


Re: New TA Log from AK!

Paul B. Walker, Jr.
 

Correction.. 1415-1420 UTC.  sorry. Mitten covered fingers to blame. 

Paul 

On Mon, Oct 4, 2021 at 6:22 AM Paul B. Walker, Jr. via groups.io <walkerbroadcasting=gmail.com@groups.io> wrote:
Pretty decent signal at times from IRIB Iran in Russian on 1449Khz at 1615-1620UTC!  First  heard here because KLAM is usually very strong!

Paul standing outside in 15 degree weather to type this!


New TA Log from AK!

Paul B. Walker, Jr.
 

Pretty decent signal at times from IRIB Iran in Russian on 1449Khz at 1615-1620UTC!  First  heard here because KLAM is usually very strong!

Paul standing outside in 15 degree weather to type this!


Re: Publication news

biometuy
 

Hi Robert:

Can you share more information and schematics?, sounds very good this approach and new design.

Congrats good work!

Best Regards

JJ


Antenna switcher and splitter

Jorge Garzón <iberiaDX@...>
 

Hi,
I am considering to assembly an antenna switcher and splitter. Did you build yours or buy it from a dealer? I would like to share some beverages with a receiver or two, and also split a signal to share it with two/three rigs.
Any advice welcome!
73

Jorge Garzón Gutiérrez "IberiaDX" 
(EB7EFA · EA1036 SWL · BDXC Member 1409) 
QTH: IN83ag / 43º15' N · 03º56' W
San Roque 95, casa 5 (Villasevil)
39698 Santiurde de Toranzo (ESPAÑA - SPAIN)
..................................................................................
Blog: IberiaDX  · Twitter: @IberiaDX


Long Term DXing Project - 3/10/2021

Paul Blundell
 

Sunday, October 3, 2021

Long Terms DXing Project - 3/10/2021

10am
Digitech AR-1733

LTDXPFreq(MHz)Callsign
30.5313GG
10.5492CR
40.6213RN
20.6933AW
40.7743LO
20.8283GI
20.8553CR
00.8915AN
11341HPON GEELONG
11422HPON MELB


Re: Publication news

Robert Conboy
 

Nor is that the only form-factor you can use. I built this one inside large plastic food jars.  This is an active, regenerative FSL antenna built from 7 inch ferrite bars housed in large plastic food jars.  There is a pickup coil, a feedback coil, and a tuned coil. The pickup coil feeds an amplifier. The amplifier output goes through a 500 Ohm potentiometer to the feedback coil. This dramatically increases the sensitivity and narrows the selectivity - adjustable by the potentiometer.   The antenna also works as a regular FSL when the amplifier is switched off.







On Oct 3, 2021, at 3:53 PM, Phil Pasteur via groups.io <ppasteur@...> wrote:

Thanks... !!
And I did subscribe.


Re: Publication news

Phil Pasteur
 

Thanks... !!
And I did subscribe.

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