Date   

Re: Digitech AR-1733

Paul Blundell
 

Hi.  I have one of these.  What are you having trouble getting to work?  They are sold by Jaycar. 


On Sun, 17 Feb 2019, 8:34 a.m. Will <will_k53@... wrote:
Hi Folks,


I picked up this radio at op shop (Thrift store) yesterday. Seems to be
small enough but not sure if it qualifies otherwise.

I think this was a Dick Smith item before they went bust. Without
instructions i'm having difficulties setting it up. Anybody able to help?

It covers airband what would be a good frequency to listen on? I'm
located in Horowhenua but near sea level.

Cheers

Will





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Digitech AR-1733

Will <will_k53@...>
 

Hi Folks,


I picked up this radio at op shop (Thrift store) yesterday. Seems to be small enough but not sure if it qualifies otherwise.

I think this was a Dick Smith item before they went bust. Without instructions i'm having difficulties setting it up. Anybody able to help?

It covers airband what would be a good frequency to listen on? I'm located in Horowhenua but near sea level.

Cheers

Will


Re: Gary's Ultralight DX shootout

radiojayallen
 

Thanks Vincenzo...that is very gratifying to hear.

Jay


Portable Radio RXing Session - Tailrace Park - 16/2/2019

Paul Blundell
 

DATE: 16/02/2019
TIME: 7:45 PM
LOCATION: Tailrace Park, Riverside Tasmania
RADIO: Digitech AR-1733

AM BCB
540 - 7SD
621 - 3RN
693 - 3AW
747 - 7PB
774 - 3LO
936 - 7ZR
1008 - HPON LAUNCESTON
1053 - 2CA
1152 - 2WG
1206 - 2CC
1224 - 3EA
1278 - 3EE
1593 - HPON MELBOURNE

FM BCB
87.6 - TasRacing
88.0 - United Christian Broadcasters
89.3 - LA FM
90.1 - Chilli FM
90.9 - Triple J
91.7 - ABC Northern Tasmania
92.5 - ABC News Radio
93.3 - ABC Classic FM
94.1 - ABC
96.5 - City Park Radio
100.3 - LA FM
101.1 - Chilli FM
102.7 - ABC
103.7 - City Park Radio
105.3 - WAY FM
106.9 - RPH Radio

AIRBAND
118.7 - Launceston Tower
123.8 - ATC
126.5 - ATC
129.5 - Qantas
134.75 - Launceston AWIS

Photos: https://tassieradiorxer.blogspot.com/2019/02/portable-radio-rxing-session-tailrace.html
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Re: Performance of New R40C1 Ferrite Material Loopstick

Rik
 

Thanks! Lots of info for me to study and attempt to understand.

In a file on this group it was mentioned the 2 Polydoroff windings over interrupted ferrite cylinders resulted in very strong nulls allowing strong local stations to be nulled to hear distant ones on the same frequency. As far as you know, has any one invested that farther? That is what I plan to experiment with first with the new ferrite.

Thanks for all your efforts and answering questions arising out of my minimal knowledge of RF theory. - FARMERIK


Re: Airband Radio on Ultralight Radios

Paul Blundell
 

Thanks for the information and confirming that it does scan on the air and.  I will need to get one when I can. 


On Sat, 16 Feb 2019, 8:47 a.m. Emily Keene via Groups.Io <comprimario=yahoo.com@groups.io wrote:
I use the Skywave radios from CCrane and an HXDATA D-808 to scan the air band. I live across the bay from NYC and hear huge amounts of air traffic with these receivers. I got the tiny little HanRongDa HRD-737 and it scans the air band as well. It isn't as powerful as the larger receivers, but it definitely scans the air band, and receives adequately. My nephew is a pilot and flight instructor, so I am particularly interested in this band. I was always sad that the Grundig G6 didn't scan the air frequencies. The ones I mentioned definitely do.


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Re: Performance of New R40C1 Ferrite Material Loopstick

Gary DeBock
 

Richard,

Modern DSP chips (SiLabs 4734, 4735 etc.) work well with any coil inductance from 180-450 uH (or even more), so as long as the loopstick coil inductance is within this range, the number of coil turns has little relation to sensitivity. If you get outside of this recommended range then you may suffer a sensitivity drop off on either the high or low band edge (some experimental results are posted at  http://www.mediafire.com/file/jwdqmdzmi0j/CoilInductanceShootout.doc/file
Yesterday's testing was done with live (weak) daytime DX signals, and no Q meter was involved. The testing will continue this afternoon, with a full report made later.

Gary DeBock (in Puyallup, WA, USA)

 
 


Re: Airband Radio on Ultralight Radios

Emily Keene
 

I use the Skywave radios from CCrane and an HXDATA D-808 to scan the air band. I live across the bay from NYC and hear huge amounts of air traffic with these receivers. I got the tiny little HanRongDa HRD-737 and it scans the air band as well. It isn't as powerful as the larger receivers, but it definitely scans the air band, and receives adequately. My nephew is a pilot and flight instructor, so I am particularly interested in this band. I was always sad that the Grundig G6 didn't scan the air frequencies. The ones I mentioned definitely do.


Re: Airband Radio on Ultralight Radios

Paul Blundell
 

Thanks.  I will make use of it for single frequency listening.


On Fri, 15 Feb 2019, 9:28 p.m. Dan Merta <dnmerta0@... wrote:
No it doesn't scan the airband. Mainly good for monitoring one freq at a time.  


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Re: Performance of New R40C1 Ferrite Material Loopstick

Rik
 

Thanks Gary. I just ordered some. Do you think the additional turns of Litz are mostly responsible for improved performance?

Could you detect any difference in Q by using that radio? [or by any other means]

Experimenting in CT- FARMERIK


Re: Airband Radio on Ultralight Radios

Dan Merta
 

No it doesn't scan the airband. Mainly good for monitoring one freq at a time.  


Performance of New R40C1 Ferrite Material Loopstick

Gary DeBock
 

Early antenna experimentation in our Ultralight Radio group was based on quite a few principles borrowed from the Crystal Radio community, especially relating to High-Q Litz wire coils. Most crystal set enthusiasts are aware of a new type of ferrite material (R40C1) made of nickel and zinc, and sold by "Mkmak222" on eBay with this description:  

"The R40C1 Ferrite rod made by special formula. We don’t know why this type of Ferrite rod has very high Q when wind the coils for LW, MW and SW. Even though the material R40C is very close to R40C1, the Q is much lower with the same coil spec (usually not easy to reach 700Q in MW). I introduce the R40C1 here because the Crystal Radio enthusiast always wants to make coils that have high Q and want them as high as possible. The coils I wound with R40C1, are able to get 900 Q at 3 MHz, I did not measure higher than 3 MHz yet.  

For sure the R40C1 can use for many other applications. This field is waiting for discover by amateurs. Use this R40C1 200 X 10 mm ferrite rod and litz wire to make coils will give you a big surprise! It can get very high Q value and let the radio circuits significantly increase the selectivity and sensitivity. "  (full listing at  https://www.ebay.com/itm/NiZn-Ferrite-Rod-R40C1-200x10mm-for-High-Q-Amateur-Crystal-Radio-Coils-AM-SW/151884949745?hash=item235d0c68f1:g:3QMAAOSwNSxU-kHM:sc:USPSFirstClass!98371!US!-1:rk:1:pf:0

Today I had the chance to test out a new 200mm loopstick made with the new R40C1 material, and compare it with a standard 7.5 inch loopstick with Amidon Type 61 ferrite. Both ferrite rods had Litz wire coils of 250/46 Litz wire, and both coils were transplanted into XHDATA D-808 models (which by the way are not Ultralight radios, but which are ideal for loopstick transplants, as described at  http://www.mediafire.com/file/t2989hg61vbkb5h/Supercharging_the_XHDATA_D_-808-FinalMWLW.doc/file
Because of the lower permeability of the R40C1 material I needed to wind a much wider coil of 250/46 Litz wire than on the Type 61 Amidon ferrite rod (5 inches resulting in 288 uH, compared to 2.75 inches resulting in 350 uH), but the new 200mm loopstick XHDATA D-808 model (photo below) was generally outperforming the 7.5" loopstick D-808 in weak signal reception across the MW band this afternoon. When the testing is completed I plan to write up a full report on the comparison, and then test out the new R40C1 ferrite rods in comparison with Russian surplus ferrite rods in FSL configurations after that.

Gary DeBock (in Puyallup, WA, USA)

                                                                                     


Re: Going Paperless for Radio DXing

Paul Blundell
 

Following some feedback directly, I have made some changes to this.

https://tassieradiorxer.blogspot.com/2019/02/going-paperless-for-radio-rxing.html

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Re: Gary's Ultralight DX shootout

Vincenzo Sallustio
 

Huge fan of your page, Jay. I follow it religiously.  


Re: Group Survey

Paul Blundell
 

Thanks to everybody who has taken the time to answer the survey, the results so far are very interesting. While I am hopeful that what we are doing is "working" for the group members as a whole, it is good to get feedback on who we are as a group and what areas we can improve.
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Re: Airband Radio on Ultralight Radios

Paul Blundell
 

Thanks for the reply.

A SDR is outside the scope of this group and not what I am trying to do, which is push these radios as much as I can on the Airband.

On Thu, Feb 14, 2019 at 2:15 PM Max Italy <max2013@...> wrote:

I think that those radios are usable if you want to monitor a specific frequency but not to scan the band. They have a search function  but do not keep scanning the band to find new signals.

For this purphose i suggest to use a SDR dongle with proper software. See a sample video here https://youtu.be/5Yr35n7foks
The software is called Theremino SDR but i think that there is also some plugin for SDRsharp do this.



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Paul


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Re: Airband Radio on Ultralight Radios

Max Italy
 

I think that those radios are usable if you want to monitor a specific frequency but not to scan the band. They have a search function  but do not keep scanning the band to find new signals.

For this purphose i suggest to use a SDR dongle with proper software. See a sample video here https://youtu.be/5Yr35n7foks
The software is called Theremino SDR but i think that there is also some plugin for SDRsharp do this.


Re: Airband Radio on Ultralight Radios

Paul Blundell
 

Thanks for the information Andy.

I want to see how far I can "push" Airband reception on these radios and find the best possible models which cover this band.


On Thu, Feb 14, 2019 at 8:58 AM Andy ZL3AG via Groups.Io <zl3ag=radioengineering.com@groups.io> wrote:

Be aware that airband reception on the AR-1780 is provided by a separate chipset tacked on to the input of the AM/FM chipset.

I haven't tested the effect on the AM BCB side, but the FM sensitivity of the AR-1780 is well down on other radios with the same chipset, as the chipset expects to be connected directly to a whip antenna, not via added circuitry.

If you want airband reception, you're probably better of researching specialised airband portables and sniping a 2nd hand one on your favourite auction site.

On 14/02/19 10:40 AM, Paul Blundell wrote:
> Thanks for the information Dan, this radio is on my list to purchase when my funds allow :)
>
> Does it "scan" the airband at all? That is one thing I do miss. I have a 30 year old scanner at home that does a good job but would love something more portable. I have owned most scanners that have come out over the years at one time or another so know them well.
>
> On Wed, Feb 13, 2019 at 9:45 PM Dan Merta <dnmerta0@... <mailto:dnmerta0@...>> wrote:
>
>     My Digitech AR-1780 has airband and it seems to work quite well. I'm not far from a training airport in Melb Sth East called Moorabbin airport so it picks up those freqs well. The ATS is 120.9000MHz runway left 118.1000MHz, runway right 123.0000MHz & ground is 119.9000MHz
>     I can also pick up Melbourne International airport. (Tullamarine) Esp Melbourne radar on 132.0000MHz
>     For airband listening I use a Uniden ubcd396xt scanner with a VHF 2 meter ham band antenna which enables me to hear all the Melbourne air traffic.
>     https://uniden.com.au/product/ubcd396xt/
>
>
>
> --
> Paul
>
>
> --
> Paul - Moderator
> UltralightDX
>





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Re: Airband Radio on Ultralight Radios

Andy ZL3AG
 

Be aware that airband reception on the AR-1780 is provided by a separate chipset tacked on to the input of the AM/FM chipset.

I haven't tested the effect on the AM BCB side, but the FM sensitivity of the AR-1780 is well down on other radios with the same chipset, as the chipset expects to be connected directly to a whip antenna, not via added circuitry.

If you want airband reception, you're probably better of researching specialised airband portables and sniping a 2nd hand one on your favourite auction site.

On 14/02/19 10:40 AM, Paul Blundell wrote:
Thanks for the information Dan, this radio is on my list to purchase when my funds allow :)
Does it "scan" the airband at all? That is one thing I do miss. I have a 30 year old scanner at home that does a good job but would love something more portable. I have owned most scanners that have come out over the years at one time or another so know them well.
On Wed, Feb 13, 2019 at 9:45 PM Dan Merta <dnmerta0@... <mailto:dnmerta0@...>> wrote:
My Digitech AR-1780 has airband and it seems to work quite well. I'm not far from a training airport in Melb Sth East called Moorabbin airport so it picks up those freqs well. The ATS is 120.9000MHz runway left 118.1000MHz, runway right 123.0000MHz & ground is 119.9000MHz
I can also pick up Melbourne International airport. (Tullamarine) Esp Melbourne radar on 132.0000MHz
For airband listening I use a Uniden ubcd396xt scanner with a VHF 2 meter ham band antenna which enables me to hear all the Melbourne air traffic.
https://uniden.com.au/product/ubcd396xt/
--
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UltralightDX


Re: Airband Radio on Ultralight Radios

Paul Blundell
 

Thanks for the information Dan, this radio is on my list to purchase when my funds allow :)

Does it "scan" the airband at all? That is one thing I do miss. I have a 30 year old scanner at home that does a good job but would love something more portable. I have owned most scanners that have come out over the years at one time or another so know them well.

On Wed, Feb 13, 2019 at 9:45 PM Dan Merta <dnmerta0@...> wrote:
My Digitech AR-1780 has airband and it seems to work quite well. I'm not far from a training airport in Melb Sth East called Moorabbin airport so it picks up those freqs well. The ATS is 120.9000MHz runway left 118.1000MHz, runway right 123.0000MHz & ground is 119.9000MHz 
I can also pick up Melbourne International airport. (Tullamarine) Esp Melbourne radar on 132.0000MHz 
For airband listening I use a Uniden ubcd396xt scanner with a VHF 2 meter ham band antenna which enables me to hear all the Melbourne air traffic. 
https://uniden.com.au/product/ubcd396xt/



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