Date   

Re: Review - Digitech AR-1780 Multi-band Radio Receiver - battery choice

Michael Schuster
 

Perhaps the most knowledgeable folks regarding cylindrical Li-Ion batteries, and 18650's in particular (because of their enduring popularity starting as components of computer battery packs) are the flashlight enthusiasts. To paraphrase the common wisdom:

  • Stick to brand names (Panasonic, LG, Samsung, Nitecore, KeepPower, Sony, Fenix, Aspire, Efest, etc)
  • Don't buy off eBay or Amazon as there are too many fakes
  • Don't buy any battery or charger having "Fire" in its brand name


Re: 558-6WA Received on an 8 inch FSL at Rockwork (9,153 miles)

Jerry Rappel
 

Always a great report Gary,

Jerry WW0E

On Sun, Aug 9, 2020 at 9:33 PM Gary DeBock via groups.io <D1028Gary=aol.com@groups.io> wrote:
Australian stations kicked into high gear at the plunging Rockwork cliff this morning as 558-6WA in Wagin, Western Australia managed a pretty decent signal on a new-design 8 inch (20cm) FSL antennas (design photo attached) at 1328 UTC.

The ABC "Nightlife" program features the female host Indira Naidoo interviewing a lady named Karen concerning the gold mine riots in New South Wales in 1861, with the full 4 hour Podcast (very temporarily) posted at https://www.abc.net.au/radio/programs/nightlife/nightlife/12517014

The phrase "November of 1860" is spoken by the interviewee Karen at 1:52 in the radio recording of 6WA posted at https://dreamcrafts.box.com/s/h66frtuns42ykkpvw27ck2no3u22dtb5
The same "November of 1860" phrase is spoken by Karen at :59 in the ABC Podcast segment (at somewhat stronger strength) posted at https://dreamcrafts.box.com/s/bd7cnf7fpzj9ddbx0gdio6y5w361xjli

For those needing to use the ABC website to confirm an Australian reception, you should be aware that ABC has drastically reduced the time that these Podcasts are posted, so you need to track them down ASAP!

73 and Good DX,
Gary DeBock (DXing with Tom at the Rockwork 4 Ocean Cliff near Manzanita, OR, USA)


558-6WA Received on an 8 inch FSL at Rockwork (9,153 miles)

Gary DeBock
 

Australian stations kicked into high gear at the plunging Rockwork cliff this morning as 558-6WA in Wagin, Western Australia managed a pretty decent signal on a new-design 8 inch (20cm) FSL antennas (design photo attached) at 1328 UTC.

The ABC "Nightlife" program features the female host Indira Naidoo interviewing a lady named Karen concerning the gold mine riots in New South Wales in 1861, with the full 4 hour Podcast (very temporarily) posted at https://www.abc.net.au/radio/programs/nightlife/nightlife/12517014

The phrase "November of 1860" is spoken by the interviewee Karen at 1:52 in the radio recording of 6WA posted at https://dreamcrafts.box.com/s/h66frtuns42ykkpvw27ck2no3u22dtb5
The same "November of 1860" phrase is spoken by Karen at :59 in the ABC Podcast segment (at somewhat stronger strength) posted at https://dreamcrafts.box.com/s/bd7cnf7fpzj9ddbx0gdio6y5w361xjli

For those needing to use the ABC website to confirm an Australian reception, you should be aware that ABC has drastically reduced the time that these Podcasts are posted, so you need to track them down ASAP!

73 and Good DX,
Gary DeBock (DXing with Tom at the Rockwork 4 Ocean Cliff near Manzanita, OR, USA)


Antenna Hi Q Compensation -- Audio Bandwidth Fidelity Reprocessing

Alex P
 

I have read with interest the recent posts regarding Hi Q FSL results.

Of note is the very high Q and degradation of audio intelligibility as a result of the resulting audio bandwidth reduction.

Comments have been made that audio processing / reprocessing can, will or may be used to recover the audio intelligibility.

My question:  What audio processing / software is available to recover the loss of frequencies  and bandwidth intelligibility due to the Hi Q bandwidth reduction of antennas?    

TIA

Alex


Re: Review - Digitech AR-1780 Multi-band Radio Receiver - battery choice

Powell
 

On You Tube a person tested these batteries.  The Chinese ones failed. The Japanese ones did well. 

Powell 


Re: 18650 battery test in Xhdata D-808 radio

Max Italy
 

@ Rémi Friess the battery in my D-808 is Xhdata branded 2000mA

https://i.imgur.com/rFpmUrb.jpg

@ Kenny Murray i use vaping gear and i have a lot of 18650 batteries but keep in mind that most vaping gear (if not all) use flat-top batteries while you need button-top.
Flat-top batteries are shorter and you can adapt them using one of those Neodymium magnets sold on ebay or aliexpress , see  https://www.ebay.co.uk/itm/321296194078 or https://www.aliexpress.com/item/32792488474.html

The good point is that vaping gear draw a lot of current and use batteries rated 25A minimum; most are rated 35A. You do not need high current batteries for your radio, you need high capacity, however you can be sure that  if the battery is good for vaping it is good quality (still need the magnet extension) or it will not work at all.

In "normal times" quality batteries can be purchased online for less than $3 each from China including shipping but nowadays with Covid-19 most sellers apply huge shipping charges.
I use these for my vaping gear https://www.aliexpress.com/item/32821524948.html  and they are as good as the famous brands.

 

 

 


Re: 18650 battery test in Xhdata D-808 radio

Kenny Murray
 

I avoided using the 18650's because the radio i choose was the tecsunpl365 and uses aa batteries. i use 3 aa duracell 2500mah batteries.. no complaints with anything...

having said this.. research with rc models.. portable radios. ect..

avoid the belief of over ratings of many products such as 18650 batteries.

what is good is this.. the ones from LG and the pnes from panasonic..

simple place to get them.. go to a smoke shop.. they sell them to use in smoking vaporizors.

i have a countycom gp5ssb.. i use aa batteries.. as duracell.. nimh

* i was previous use many batteries of energizer.. and i sopped doing so.. they are not good batteries any more and warranty for such products is very poor.. i used 8 in an avation radio.. cycled maby 12 times over 4 years.. occasional standby usage.. there was defects in 2 of the batteries.. two sets of 4.. a cost of 50$.. energizer offered 5$ coupon. waste of time..

ask anyone who has a vape unit.. what is the best battery..

thats your answer for your radio.. rc toy.. laptop rebuild. HT radio pack..

they will tell you LG and panasonic.. as for the specific brand.. they have the battery in the sales at the smoke store.. the one that sells vape items..

it is a vape battery you want.. it is the same as your radio..




best wishes..


======================== Kenneth J. Murray VO1KJM EM: murraykj709@... Telephone: 506-962-8401 ======================== Inmarsat: AOR WEST: 011-870-76-4156467 ============================================================================= Confidentiality : This message is intended only for the use of the individual or entity to which it is adressed and may contain information which is confidential and privileged. Confidentiality and privilege are not lost by this email having been sent to the wrong person. If you are not the intended recipient or the person responsible to deliver it to the intended recipient, please notify us by email and delete this document immediately. Any distribution, reproduction or other of this email by unintended recipient is prohibited.


On Sunday, August 2, 2020, 9:37:37 AM ADT, radiojayallen <radiojayallen@...> wrote:


I've been interested in reading about people's varying experiences with battery life on this radio. Since I had never noticed a problem with battery life on my XHDATA D-808 with its original battery compared with other rechargeable radios (although it is one of many radios I regularly use in rotation so it's hard to judge), I am running an informal real-world test.

I charged the radio, then started using it for two hours a day on AM at medium volume with the light off. So far I have completed two weeks (14 days) which would amount to approximately 28 hours and although the battery meter initially drops rapidly it is still showing 2 bars. I will report total hours when it finally shuts off, but it seems clear that people are having vastly different results. Of course if I were playing it more loudly it would have certainly been depleted by now so there is a bit of subjectivity to this. But at least compared to other radios with internal rechargeable batteries the D-808 with it stock battery seems fine.

FWIW.

Jay


Re: 18650 battery test in Xhdata D-808 radio

Mark Roberts
 

I have two D-808's and they show somewhat different results. It's true that they now have different batteries as well, but the radios behaved differently even when they had the same type of battery.

The two D-808's came from the same Israeli reseller, about a couple of months apart.

There are so many variations possible that it seems challenging to design a good experiment that would help clear the matter up.

I just got a Tecsun ICR-110, which uses the same kind of battery, possibly to power a 3-watt amplifier (very beefy sound on this one, not like the other Tecsuns I've had). The charge indicator is very different from other radios I've had. It will be interesting to see how long its battery lasts in service.


Re: How best to inexpensively clean degraded variable caps?

Ron Layton <micron327@...>
 

I'm a disabled veteran and funds are very tight. I can't really afford De-Oxit but, I have found a viable alternative. I use CRC QD Electronic Cleaner and it works just fine. I have used it to clean recycled variable caps from old radios as well as normal use such as sticky and scratchy switches and pots. I think I paid around $4 for an 11 ounce can not too long ago.
73's
Ron


Re: 18650 battery test in Xhdata D-808 radio

radiojayallen
 

Mine is an XHDATA labelled cell rated at 2000 mAh.


Re: 18650 battery test in Xhdata D-808 radio

Rémy Friess
 

What sort of battery is it?

My D-808 came with a 2000 mAh type. A friend of mine got a set with a 1600 mAh type, another with a 1200 mAh, and it seems some come with 3600 mAh batteries.

It seems they include the type of battery they can lay their hand on when dispatching the stuff.

Rémy.

Le 02/08/2020 à 14:37, radiojayallen a écrit :

I've been interested in reading about people's varying experiences with battery life on this radio. Since I had never noticed a problem with battery life on my XHDATA D-808 with its original battery compared with other rechargeable radios (although it is one of many radios I regularly use in rotation so it's hard to judge), I am running an informal real-world test.

I charged the radio, then started using it for two hours a day on AM at medium volume with the light off. So far I have completed two weeks (14 days) which would amount to approximately 28 hours and although the battery meter initially drops rapidly it is still showing 2 bars. I will report total hours when it finally shuts off, but it seems clear that people are having vastly different results. Of course if I were playing it more loudly it would have certainly been depleted by now so there is a bit of subjectivity to this. But at least compared to other radios with internal rechargeable batteries the D-808 with it stock battery seems fine.

FWIW.

Jay


Re: 18650 battery test in Xhdata D-808 radio

radiojayallen
 

I've been interested in reading about people's varying experiences with battery life on this radio. Since I had never noticed a problem with battery life on my XHDATA D-808 with its original battery compared with other rechargeable radios (although it is one of many radios I regularly use in rotation so it's hard to judge), I am running an informal real-world test.

I charged the radio, then started using it for two hours a day on AM at medium volume with the light off. So far I have completed two weeks (14 days) which would amount to approximately 28 hours and although the battery meter initially drops rapidly it is still showing 2 bars. I will report total hours when it finally shuts off, but it seems clear that people are having vastly different results. Of course if I were playing it more loudly it would have certainly been depleted by now so there is a bit of subjectivity to this. But at least compared to other radios with internal rechargeable batteries the D-808 with it stock battery seems fine.

FWIW.

Jay


Re: 18650 battery test in Xhdata D-808 radio

Phil Pasteur
 

Thanks for doing the testing Steve. It confirms what I have  experienced  with some of the specific batteries that you tested. It also confirms what I have  read and would have expected about the super rated Chinese cells.


Re: 18650 battery test in Xhdata D-808 radio

Steve Ratzlaff
 

Reading my comments, it might seem that I put the on/off switch in parallel with the load resistors but that is not so--I put the switch in series with the load resistors (which were in parallel to give the 50 mA test current) so I could connect this setup to the battery and turn on the switch to start the load test, and turn off the switch to stop the load test once the batteries had dropped down to approximately 3.40 volts. I hope no one is still confused!

Steve

On 7/31/2020 6:45 PM, STEVE wrote:
I greatly enjoyed the previous comments about battery life in the Xhdata D-808 radio and how battery life varies so much and was motivated to run some tests of my own.

I ran some tests on my own various 18650 batteries. First I found the radio battery indicator would flash and the radio would not stay on at 3.403 volts, indicating I should test batteries with a load simulating the radio until they were discharged to about 3.40 volts. I found the radio tuned to a station, backlight off (the light greatly increases current draw), with low to medium volume drew about 50 mA and used that current for my test. I used two 150 ohm 1/4 watt resistors in parallel with an on/off switch to give such a load across the battery, tested outside of the radio of course. I bought four new Samsung "36G 10A 3600 mAh" batteries off eBay, charged them one time initially for the test. Those four batteries all lasted over 52 hours with the 50 mA load before dropping to 3.44 volts where I stopped the test for those batteries. The 2000 mAh battery that came with the radio, which I did not recharge after it had been charged maybe 6-8 months previously and taken out of the radio and let sit (its no-load voltage was 4.079V) lasted 28.5 hours. A Tecsun-branded 2000 mAh battery, also previously charged and let sit 6-8 months earlier, with no-load voltage 4.179V, lasted 31 hours and 15 minutes. Two old "GTF 9800 mAh" branded batteries that I'd used in flashlights were much poorer; both lasted only 11 hours.

The Samsung 3600 mAh batteries gave very long life but they are not inexpensive, almost $10 each with shipping and tax. Maybe other brands of 3600 mAh batteries would work similarly but I can't say.

73,

Steve


18650 battery test in Xhdata D-808 radio

Steve Ratzlaff
 

I greatly enjoyed the previous comments about battery life in the Xhdata D-808 radio and how battery life varies so much and was motivated to run some tests of my own.

I ran some tests on my own various 18650 batteries. First I found the radio battery indicator would flash and the radio would not stay on at 3.403 volts, indicating I should test batteries with a load simulating the radio until they were discharged to about 3.40 volts. I found the radio tuned to a station, backlight off (the light greatly increases current draw), with low to medium volume drew about 50 mA and used that current for my test. I used two 150 ohm 1/4 watt resistors in parallel with an on/off switch to give such a load across the battery, tested outside of the radio of course. I bought four new Samsung "36G 10A 3600 mAh" batteries off eBay, charged them one time initially for the test. Those four batteries all lasted over 52 hours with the 50 mA load before dropping to 3.44 volts where I stopped the test for those batteries. The 2000 mAh battery that came with the radio, which I did not recharge after it had been charged maybe 6-8 months previously and taken out of the radio and let sit (its no-load voltage was 4.079V) lasted 28.5 hours. A Tecsun-branded 2000 mAh battery, also previously charged and let sit 6-8 months earlier, with no-load voltage 4.179V, lasted 31 hours and 15 minutes. Two old "GTF 9800 mAh" branded batteries that I'd used in flashlights were much poorer; both lasted only 11 hours.

The Samsung 3600 mAh batteries gave very long life but they are not inexpensive, almost $10 each with shipping and tax. Maybe other brands of 3600 mAh batteries would work similarly but I can't say.

73,

Steve


Re: Recent approved ultralight DX radio list; proposing Eton Elite Mini

Russ Edmunds
 

Remember that for MW, the smaller the ferrite antenna, the worse MW reception will be.

Russ Edmunds

WB2BJH

Blue Bell, PA

Grid FN20id


From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> on behalf of Michael Schuster via groups.io <schuster.ma@...>
Sent: Friday, July 31, 2020 10:51 AM
To: main@UltralightDX.groups.io <main@UltralightDX.groups.io>
Subject: Re: [UltralightDX] Recent approved ultralight DX radio list; proposing Eton Elite Mini
 

[Edited Message Follows]

While the Eton Mini might not be great at MW, I wouldn't discount everything with the same form factor. I have the Sangean DT-180 and it is fairly sensitive. I believe the selectivity is better than my Grundig G4000A although I've never compared that side to side.
Actually most of the pocket-sized Sangean portables are at least adequate on MW, and some are very good to excellent. Even the worst of them pretty much outclasses the Eton Min IMHO


Re: Recent approved ultralight DX radio list; proposing Eton Elite Mini

Michael Schuster
 
Edited

While the Eton Mini might not be great at MW, I wouldn't discount everything with the same form factor. I have the Sangean DT-180 and it is fairly sensitive. I believe the selectivity is better than my Grundig G4000A although I've never compared that side to side.
Actually most of the pocket-sized Sangean portables are at least adequate on MW, and some are very good to excellent. Even the worst of them pretty much outclasses the Eton Mini IMHO


Re: Recent approved ultralight DX radio list; proposing Eton Elite Mini

Thomas Kane KC1MAT
 

While the Eton Mini might not be great at MW, I wouldn't discount everything with the same form factor. I have the Sangean DT-180 and it is fairly sensitive. I believe the selectivity is better than my Grundig G4000A although I've never compared that side to side.


Re: Recent approved ultralight DX radio list; proposing Eton Elite Mini

Michael Schuster
 
Edited

The assessment of relative performance on MW vs FM is true. I bought the earlier packaging of the Eton Mini a couple of years ago during one of the periodic Amazon fire sales. It is adequate for local MW listening but far from DX material. MW performance is limited by tiny ferrite antenna and DSP-related audio artifacts. I had intended to take it on a trip but reconsidered at the last minute; it's sat in the box ever since.


Re: Recent approved ultralight DX radio list; proposing Eton Elite Mini

radiojayallen
 

I personally find this group to be one of the most interesting and enjoyable of all the radio-related groups I belong to. Yes, it has morphed a bit from its inception as Gary explained, but I consider that the content posted here is usually worth reading, even though I was never a strict Ultralight user. I love portable radios of many stripes and tend to favor higher performing radios for listening around the house but the info provided here on antennas and general listening information adds a lot to my enjoyment. 

Jay

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