Re: Micro BitX No Audio TDA2822?
Could work, first time this was suggested.
An extra wire, the Raduino regulator would get hotter.
?
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On Thu, Mar 15, 2018 at 03:39 pm, Joe Puma wrote:
Jerry has the group discussed pulling 5v from somewhere else like use the 5v that powers the Raduino? Maybe temporarily until they can get a regulator and or new WX chip??
?
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Re: RD transistors, unobtanium?
Title. Fake news.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
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On Mar 15, 2018, at 6:18 PM, Dave Bottom < ars.kd6az@...> wrote: Where did this info come from???
RF Parts shows these in stock. I just purchased both the RD16HHF1 and RD15HVF1 in quantity from RF parts and received them in 2 days.
Mitsubishi still shows these on their Web Site as * New Devices
Dave WI6R
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Re: RD transistors, unobtanium?
Where did this info come from???
RF Parts shows these in stock. I just purchased both the RD16HHF1 and RD15HVF1 in quantity from RF parts and received them in 2 days.
Mitsubishi still shows these on their Web Site as * New Devices
Dave WI6R
On Wed, Mar 14, 2018 at 12:45 PM, Ashhar Farhan <farhanbox@...> wrote: Does anyone have news of this? RF Parts is no longer stocking RD16HHF1 and they have marked RD15HVF1 as EOL. where does that leave us all?
- f
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Re: RD transistors, unobtanium?
Actually, the closest available MOSET to the IRF510
is the IRF512, which is the same device, only it is rated
for a drain voltage of 100v. It goes by other numbers as well.
There are many devices which are on a par with the IRF510.
such as the IRFZ10 and the BUZ20. Fairchild is a major
manufacturer. Try looking for MOSFETS with about the same
drain voltage or better, low R(ds) on, and relatively low gate
capacitance. It is the gate capacitance which makes the
real difference for a multi-band device. The IARF520 is ok;
it can be adapted; but there are others which are better.
Mind you, none of these include any RF devices. The real
reason they are used is because they can be adapted to RF,
and they are much cheaper than the RD16XXXX devices.
AFAIK, most of the RD05/15/16XXXX devices are still being
made, and the Hitachi devices are still readily available. That
may change tomorrow...
john
AD5YE
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Re: 13.8 v power supplies safe for bitx?
When you current limit the PA you are doing the same thing that happens when you overdrive a linear amp and cause flat-topping, i.e. the PA is driven out of its linear range. That causes spurious products in your transmitted signal. You would be better off fusing your PA so it can't pull too much current. Then adjust your drive level so the fuse never blows. tim ab0wr On Wed, 14 Mar 2018 15:15:40 -0700 "Walter" <W9KJO@...> wrote: On Wed, Mar 14, 2018 at 01:28 pm, Jerry Gaffke wrote:
Had never heard of Drok, they have lots of stuff up on Amazon.
Does your Drok allow you to set the max current anywhere from 0
Amps to say 5 Amps?
Sorely needed.
Lots of cheap switchers out there now, but none of them seem to deal
properly with current limiting.
Should be able to set both the regulated voltage and the max
current. If the load sucks too much current, the voltage drops
until the current comes within the set limit.
Any of those switchers could do this for the price of an op-amp and
a pot, maybe an extra $1.
Jerry, KE7ER
?
On Wed, Mar 14, 2018 at 12:47 pm, Walter wrote:
A little more expensive model put out by droke even has a current
limiting feature.
Well, I had not thought about the current limit.
I installed one for the PA voltage that does not have the current
limit feature.? I will change it out to the current limit model and
use the voltage only for the board supply.
Now I just need to figure out how to adjust the current limit.? I
think a resister network to draw current while I adjust it to the
desired current level.? That would be a great safety feature.
Anyone have an idea about what the max safe current for the PA buss
would be??
--
73, W9KJO
Walter
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Re: Micro BitX No Audio TDA2822?
Jerry has the group discussed pulling 5v from somewhere else like use the 5v that powers the Raduino? Maybe temporarily until they can get a regulator and or new WX chip??
Joe KD2NFC?
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On Mar 15, 2018, at 5:04 PM, Sajid Rahum via Groups.Io < zs735@...> wrote: Thanks Jerry
I did see the other fix to add LM7805 regulator plus 1 .1uF cap.? I will order 2073D if someone has tried it as well.
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Re: Raduino oscilators. 33mhz and 57mhz. Documentation says one thinng, but this is what I measured.
Jerry, A lucid and easy to follow explanation! Thank you! tim ab0wr On Wed, 14 Mar 2018 10:59:28 -0700 "Jerry Gaffke via Groups.Io" <jgaffke@...> wrote: Here's a current and more complete summary of what's going on with
the uBitx. For the few who really really want to know.
Not many, judging from the response to post 44278.
Actual frequencies used in the original uBitx code are to have clk0
(bfo) fixed at 11996500 hz, maybe 500hz below the 12mhz filter's 2000
hz wide 3dB passband. Oscillator clk1 (second local oscillator) is
fixed at 56995000 hz for USB and 32995000 hz for LSB. You can find
those three numbers in file ubitx_20.ino at lines 166, 163, 164
respectively. I'm looking at the version dated Dec 6, 2017:
??
The vfo is used to select the operating frequency Fop according to
these formulas. For USB:? ? Fop? = vfo - (clk1-bfo)? ? ? ?so? ? vfo =
Fop + (clk1-bfo)? ? ? ?where clk1 is around 45mhz+12mhz For LSB:
Fop? = vfo - (clk1+bfo)? ? ? ?so? ? vfo = Fop + (clk1+bfo)? ? ? where
clk1 is around 45mhz-12mhz
To receive a 7.2mhz LSB signal (where 7.2mhz is the frequency of the
suppressed carrier), the VFO gets set to
?7200000+(32995000+11996500) = 52191500 hz. That formula gives an
exact result, not an approximation.
Regarding USB vs LSB:
The BFO corresponds to the carrier frequency of the station being
received or transmitted. The 12mhz filter is always above the BFO, so
within the 12mhz IF it allows through only the upper sideband. The
VFO is always above the 45mhz first intermediate frequency, and so
always inverts the sidebands: A carrier at 7200000 would get
translated to vfo-Fop = 52191500 - 7200000 = 44991500 hz A lower
sideband at 7198500 would get translated to 52191500 - 7198500 =
44993000 hz
In this example we assume the lower sideband is generated from a
single audio tone into the mike of 1500 hz. I have chosen 1500 hz
because it will land in the middle of the 12mhz filter's
passband,?assuming the filter has a 3 dB passband that's 2000 hz wide
and the BFO is 500 hz below that passband. The actual range of
frequencies passed will be 500 to 2500 hz. Those assumptions of 2000
hz and 500 hz might be off by a couple hundred hz.
Likewise, a high side clk1 of 56995000 hz? for USB always flips the
sidebands when translating to 12mhz, however the low side clk1 of
32995000 hz we use to receive the 7.2mhz LSB signal does not: Our
7.2mhz carrier:? ? 44991500 - 32995000 =? 11996500 hz? ? (exactly
equal to our BFO frequency) Our 7.2mhz lower sideband:? 44993000 -
32995000 = 11998000 hz? (in the middle of the crystal filter passband)
That's how the original uBitx code works.
I believe there is a problem because where an LSB signal hits the
45mhz filter will be 4khz removed from where a USB signal hits it,
resulting in a different audio quality between the two. A solution to
this is found in post 44278, review the previous posts in that thread
to see why. Even with the fix, there will be differences in the audio
unless the 45mhz filter response is flat across the 2000 hz at the
center.
Jerry, KE7ER
On Wed, Mar 14, 2018 at 09:07 am, Michael Shreeve wrote:
Thankyou Jerry for trying and fairly successfully explaining what
Ashhar is doing by using the ACTUAL frequencies used in the uBITX.
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Re: Soldering gun or iron
I used to watch my grandfather repair tube TV’s with this one.
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On Mar 15, 2018, at 4:48 PM, Vince Vielhaber <vev@...> wrote:
I have a small butane torch (harbor freight) that comes just before the propane torch.
Vince.
On 03/15/2018 01:59 PM, Jerry Gaffke via Groups.Io wrote:
Yes, a temperature controlled pencil iron with a fine tip would be a
good choice for working on these rigs.
That and some strong reading glasses and bright work light.
I still have the 140W gun that I built tube gear when in my teens.
Use it occasionally when soldering up large chunks of metal, perhaps
when using
12 gauge house wiring for an inductor. Beyond that, it's the propane torch.
Jerry
On Thu, Mar 15, 2018 at 10:47 am, Doug W wrote:
Kind of like asking what car you should buy or shovel or rifle or
whatever. We can be much more helpful if you know your goals. Are
you on a limited budget and this is the only thing you plan to ever
build and need the cheapest way to just get this done or do you have
so much spare cash you light Cuban cigars with $100 bills and want
the best tools that will last for generations?
Personally my go to iron is a supposedly 60w adjustable pencil type
iron that I keep planning to upgrade but I like it and it gets the
job done. I have this one
that was around $15.
It isn't available anymore but there are tons of similar Chinese
ones on Amazon. While you're at it I would suggest picking up one
of the copper scrubby looking tip cleaners.
--
Michigan VHF Corp.
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Re: USB interface cable installation uBITX
I used the one foot long cable and it fit perfectly in the Hammond Case as you can see.?? I ordered it on Amazon just because they can deliver in one hour, or next day depending on how quickly you want it. or free if you can wait a few days with Amazon Prime.?? We use it enough it's worth the annual fee.
Dave WI6R
On Wed, Mar 14, 2018 at 5:15 PM, Jonathan Peakall <jpeakall@...> wrote: Nice! Where did you get the plug/adapter?
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Re: finally finished my ubitx
Looks great Tim, I agree with you, it's a nice rig for anyone.
Joel
N6ALT
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finally finished my ubitx
Finally found time to finish up my ubitx. I am *impressed*. Tuning works fine. Audio sounds fine. Calibration is dead on. BFO is dead on. Using a 16ohm speaker the audio is plenty loud and the ws 2822 doesn't seem to get warm. The tuneup PTT current was a little low at 400ma but the bias voltage for the irf510's adjusted properly. Total of 600ma draw on ptt. The only holdup now is that my old CB mic with a dynamic element simply doesn't provide enough output. I have an old mic I'm going to put an electret element in. Notes for mods: 1. get rid of audio pops, 2. AGC. I am simply amazed at the functionality of this rig at this price point. Mr. Farhan has put out something amazing. This could literally be the first rig for thousands of new hams. tim ab0wr /g/BITX20/photo/37513/0?p=Name,,,20,1,0,0 /g/BITX20/photo/37513/1?p=Name,,,20,1,0,0 /g/BITX20/photo/37513/1?p=Name,,,20,1,0,0
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Re: Looking for Completely Functional Dual-Band 20/(17/15/10/6) Meter QRP Rig with SSB/PSK
#bitx20help
Go for Quansheng uv-r50.? Far far better than Baofeng
I ordered two of these.? I have Baofeng UV-82 side by side.? Day night difference between receivers.
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Re: Micro BitX No Audio TDA2822?
Thanks Jerry
I did see the other fix to add LM7805 regulator plus 1 .1uF cap.? I will order 2073D if someone has tried it as well.
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Re: Soldering gun or iron
The 862D+ is going for about $50-$55 right now. I have two of them and they both work great.
Vince.
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On 03/15/2018 03:51 PM, Jack Purdum via Groups.Io wrote: Me, too. I got:
Inline image
It was about $70 and it's pretty nice for the money. It has an iron, but
also hot air. I've only used it a few times, as I use my old iron for
thru-hole stuff.
Jack, W8TEE
On Thursday, March 15, 2018, 3:27:31 PM EDT, Christopher Miller
<djmalak2k6@...> wrote:
I purchased a hot air rework / iron station for around 70$ I can do smd
work with it
--
Michigan VHF Corp.
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Re: Soldering gun or iron
I have a small butane torch (harbor freight) that comes just before the propane torch.
Vince.
toggle quoted message
Show quoted text
On 03/15/2018 01:59 PM, Jerry Gaffke via Groups.Io wrote: Yes, a temperature controlled pencil iron with a fine tip would be a
good choice for working on these rigs.
That and some strong reading glasses and bright work light.
I still have the 140W gun that I built tube gear when in my teens.
Use it occasionally when soldering up large chunks of metal, perhaps
when using
12 gauge house wiring for an inductor. Beyond that, it's the propane torch.
Jerry
On Thu, Mar 15, 2018 at 10:47 am, Doug W wrote:
Kind of like asking what car you should buy or shovel or rifle or
whatever. We can be much more helpful if you know your goals. Are
you on a limited budget and this is the only thing you plan to ever
build and need the cheapest way to just get this done or do you have
so much spare cash you light Cuban cigars with $100 bills and want
the best tools that will last for generations?
Personally my go to iron is a supposedly 60w adjustable pencil type
iron that I keep planning to upgrade but I like it and it gets the
job done. I have this one
that was around $15.
It isn't available anymore but there are tons of similar Chinese
ones on Amazon. While you're at it I would suggest picking up one
of the copper scrubby looking tip cleaners.
--
Michigan VHF Corp.
|
Re: Encoder details from various suppliers
I wish they (Chinese ebay sellers) were a little easier to communicate with. The generally send this pre-packaged reply which says " We do not care about that detail" ! There is one, called Alice with some numbers, that may communicate a little easier.?
On Thu, Mar 15, 2018 at 11:05 AM, K5ESS <k5ess.nothdurft@...> wrote: And don’t depend on the picture to represent whether the mounting shaft is threaded or not.? Best to ask first but probably still no guarantee.? Ebay guarantee seems to work if parts are not as shown. Mike K5ESS ? From: [email protected] [mailto:[email protected]] On Behalf Of Michael Shreeve
Sent: Thursday, March 15, 2018 12:50 PM
To: [email protected]
Subject: Re: [BITX20] Encoder details from various suppliers ? Humm, cool, one detail I hadn't looked at. Narrows the choices a little more. And also is one more detail the Chinese don't offer. ? On Wed, Mar 14, 2018 at 5:24 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote: Of all of those links, only the last one is any good. All of the others do not have a threaded shaft, which most people will want. I've probably purchased 50 KY-40 encoders and all have worked well. I haven't used them all, so there may be a bad one lurking in the pile, but so far, so good. These do have a detent, but another post here showed how to make it "detentless". Personally I like the detent as it stops on a dime and there is no coasting. ? I've looked at encoders which I believe are used in the uBITX .? Perhaps you need one, they can be blown up with incorrect hookups, or physically just bad. Or perhaps your doing a special project and need one.?
Of course, the encoder supplied with a uBITX is kind of a special animal.?
It has the following specs. or close to it. There are a couple of important details, one the Number of Detent, and the Important spec is "without" and? , a few do not have switches and a few details like that. The link for a table showing these specs is here.?
And here is the encoder I believe to be almost exactly what we use in the Raduino .?
Now, if you try to get encoders, its really tough on ebay. Most of the details are left out. And, my experience with some listings is that if they give the details, it will be a very expensive item.? Here for example.?
From England,? GPB 8.99 $12.67 US Dollars for ONE !?
Most of the ebay listings are like this one. Cheap, but no details.
And, you will be very disappointed because one of the most important details is the encoder is the "number of detents" which should say "without". Detents are the physical click you feel when you turn it, uBITX encoders are smooth, no detents, and Alps says "without" to describe this feature. Encoders with Detents are terrible for the uBITX.? And most likely the ones supplied by Ebay will have detents.?
?And Amazon doesn't give any details either.?
I am told these would be like the ones the uBITX uses.?
But, I'm not sure how the person who referred this to me knew that. Definitely not from the listing. Was he just? lucky ??
?
--
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Re: Soldering gun or iron
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Re: Soldering gun or iron
Me, too. I got:
It was about $70 and it's pretty nice for the money. It has an iron, but also hot air. I've only used it a few times, as I use my old iron for thru-hole stuff.
Jack, W8TEE
On Thursday, March 15, 2018, 3:27:31 PM EDT, Christopher Miller <djmalak2k6@...> wrote:
I purchased a hot air rework / iron station for around 70$ I can do smd work with it
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Re: Soldering gun or iron
Thanks everyone for your suggestions and help. As soon as I get back the house I will do some more research as recommended on the iron and other parts.?
I am currently waiting by my mail box for DHL as the radio is on their truck. ?I live in the city per se, but a good quarter mile from the 2 lane paved road in some woods, so just trying to be here so driver doesn’t say he can’t find our house and takes it back with him.?
Anyways thanks again and 73 Fr Richard? WB8YXF?
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On Mar 15, 2018, at 15:13, Christopher Miller < djmalak2k6@...> wrote: I purchased a hot air rework / iron station for around 70$ I can do smd work with it
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Re: Soldering gun or iron
I purchased a hot air rework / iron station for around 70$ I can do smd work with it
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K9HZ
Joel Caulkins/N6ALT
Michael Shreeve