Date   
Plug in coils

Jim Tibbits
 

Not exactly HRO style, but makes stage matching/measuring faster and easier
8 pin dip socket ..Use another socket as a header for transformers
Also, too test points  (trim off unused pins)

Jim

Re: Stone Soup

Arv Evans
 

Allison

Interesting.  I have been experimenting with resistively loading series LC traps and find
that they can be made broad enough to cover some tunable spurs without seriously
decreasing the attenuation.  They also seem to work better if installed some place near the
middle of multiple pole filters. 

In olden days we occasionally used tunable traps, but that doesn't seem easily done with
today's compact rigs.  Today traps are mostly relegated to trap-dipole antenna designs.

But, to-each-his-own.  Obviously they might not be for everybody. 

Arv
_._


On Tue, Sep 4, 2018 at 8:31 AM ajparent1/KB1GMX <kb1gmx@...> wrote:
Are we ignoring the possibility of using series LC traps to suck out some of the bugs
(bug traps...?),      8-)

Arv,

No not ignoring them.  They are generally useless as the assumption is the
spur only happens here which is invalid, they are tunable  you tune they move.
For examplt the 10M spur for 28mhz its 17 and at 29.9999 its 15.0001
so if you are anywhere in between so is the spur somewhere in between.


reminder as it seems needed every 24 hours...

There are two issues:

Spurs that result from lack of filtering for bands over 20mhz.

Harmonics due to layout of the low pass filter switching for the 
80/40/20 meter bands.  (rewire the relays its fixed).

Since the topic is we are hams we do this stuff.  If you whine
about pulling relays and removing tracks to fix the filter issue
I offer no sympathy.  Do that or external filter, or nothing.

Allison





Re: stone soup ingredient list, what bands and modes are usable

Arv Evans
 

Allison

I have been following all the discussions but there is still some more definitive information
that us neophytes might need, or think we need.  When you say "80m harmonics, use
external low pass filter
", which specific harmonics are too high level?  Same for spurs...
what frequency, tunable...range? and so on.  Not criticizing your work, but just trying to
nudge this to the next level so that others can work on it as well. 

Thanks,

Arv
_._


On Tue, Sep 4, 2018 at 8:42 AM ajparent1/KB1GMX <kb1gmx@...> wrote:
On Tue, Sep 4, 2018 at 01:56 AM, Joe Milosch wrote:
########################
80m no cw, no ssb, no digital modes
60m digital fine
40m no cw, ssb, digital fine
30m digital fine
20m cw , ssb, digital
17m etc
15m etc
12m etc
10m etc
##########################
First item, Digital is SSB!   Really!  If SSB is not safe then digital is not either.
Now for those that have been inattentive for the last three months.

########################
80m harmonics, use external low pass filter
60m harmonics, use external low pass filter
40m harmonics, use external low pass filter
30m should be ok cw and SSB-digital
20m should be ok all modes
17m should be ok all modes.
15m CW ok, SSB has spur
12m CW ok, SSB has spur
10m CW ok, SSB has spur 
##########################

By should be ok I mean if your not over driving to try and get some power.

Re: Stone Soup

Gordon Gibby <ggibby@...>
 

​Robert -- i see that you are in Lakeland.   Isn't that somewhat in Sumter county?   I thik there are a bunch of folks into emergency ham radio commuications down there.   Anyway, that Alnico HF radio looks pretty good!!   I hadn't heard of it but one of my friends has an Alnico for HF and he is happy with it.


Yes, I think while we want to get correct information out there, different societies may have different "baselines" for what they consider "good" or "poor" and it doesn't do a lot of good to criticize some one elses radio or work..   Rather, the more useful parts of this group have been the identification of problems and then the IMPROVEMENT of those problems.   I've learned a lot, but I think some people don't grasp how their words can wound.   In print it is difficult to judge the heart of the person making the keystrokes. 


Keep up the good work!!!    Ham radio has a zillion different facets and not all of them will appeal to everyone, but we all may find something interesting next year, that we didn't, THIS year.


cheers,

gordon



From: BITX20@groups.io <BITX20@groups.io> on behalf of Robert D. Bowers <n4fbz@...>
Sent: Tuesday, September 4, 2018 1:20 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Stone Soup
 
This thread reminds me of something I've been told by hams at least three or four times in the last 38 years - and it brings up an issue that I've faced throughout those years.  Some of the posts have been OK (even encouraging), but others...

When I got my tech ticket in 1980, I scrimped and saved until I put together $300.  I was looking for a used rig of my own, to get on the air on HF (I had an ancient crystal mobile for 2m).  One ham told me he had a radio I could buy - and when I got to his house offered me a KW linear with a fried transformer, for the full $300 (tube condition unknown).  I told him it was useless without a radio and I wasn't interested in power like that anyway.  He was furious for me 'wasting his time' - and told me "If you cannot afford to buy new, you don't belong in amateur radio".  He said if I could dig up a couple hundred more dollars, he had a nice used tube only rig (that needed repair) he'd sell me.  I walked out on him and never spoke to him again.  He and his buddies were, shall we say, not welcoming at the local club - where they dominated.

That almost killed all interest.  Finally, a few years later I got interested again, and was very much into homebrew, especially antennas.  The problem was, I still didn't have a decent radio (my hf radio was an old tube rig - that didn't work too well and had a problem I couldn't figure out).  When I mentioned my frustration with the radio, I was told "What do you expect?  If you can't afford to buy new, you should consider getting out of amateur radio!"  My radio activity went downhill again - FAST.

I have a BITX20 V2 (or version B) - that's my newest hf rig as far as the age of the radio.  My "good" radio is an Alinco DX-70, bought used years ago - and it was the only working radio within my price range (had a very small inheritance come through), although I had my heart set on a IC-706mk2G.  I also have a softrock ensemble kit, but haven't put it together, because I have minimal interest in the hobby anymore. 

The sort of thing I consider true fun - trying to make the longest contact possible with the minimum power (over 600 miles on less than 10mw on HF) for instance, or VHF sideband, or even 6m AM (cheap and fun), not to mention homebrew... well, that doesn't seem as important in the hobby as more and more and MORE POWER.  I've been stomped on enough times by the "get a gallon to get out" club, thank you (you have that happen time after time after time - you end up shutting off the radio in frustration).  Funny thing, because the problems mentioned with the BITX are made far worse by attempts at increasing the power.  Maybe people should think about LESS power???

If I do anything amateur radio-wise, I may try to convert the BITX20 to 40m and fix the VFO so it doesn't drift.  I've always wanted a small, low to moderate power 40m monobander for mobile use.  That might raise some interest again.  (I bought the BITX kit unfinished and completed it - it was sold on the proviso that I actually finish the radio and use it.)  Something with a few watts on 40 would be nice - if the low-power/mobile section of the band hasn't been taken over by the kilowatt motormouths.

The moral of the story:  The BITX series of radios may be the BEST radio a ham can afford - and being poor does NOT mean being stupid or incapable.  Having one's rig run down is disheartening AT BEST, and buying the latest and greatest?  Out of the question for people with little money, even if they have brains and ability.  Reading things like I have on this thread brings back some of the not-so-pleasant memories - and those memories are why I've only used a few pages in a single logbook over the last 38 years.

My 2 cents worth...

Bob
N4FBZ

Re: stone soup ingredient list, what bands and modes are usable

Arv Evans
 

George, K1DX

Well said !  Many of us feel the same.  Benefits of this rig far outweigh the griping by others
in efforts to convince others to not purchase the rig. 

Arv  K7HKL
_._


On Tue, Sep 4, 2018 at 8:55 AM <george.woods@...> wrote:
Hi Joe and all others in the group,

I've been a ham for more than 60 years and have built several dozens of radio kits. I've owned the best equipment available in times past and having had years of experience in engineering. But, alas, I have very severely downsized and am now living in a cramped apartment not allowing the spacious DX station that I had less than two years ago. Then, along came the uBITx. It does have a thump when t/r switching and it may have spurs and harmonics. However, my son, KA1LOR, who lives 1/2 mile away doesn't hear any problem with this little rig. At a nominal 10w max out, it isn't going to bother anyone, other than the critics. After all, it is a $120 radio! Enjoy it! It is one of the rare bargains in this great hobby of ours. Make hardware mods, hack the sketches that give it character, but most of all, enjoy it. I thoroughly enjoy seeing the fun people are having with this little radio, so keep on being creative with it. 

72/73 - George, K1DX

Re: K5BCQ uBITX Relay Switched LPF/BPF board

Kees T
 

Hello Ripley,

The first thing is that all this still needs to be tested to see how well it works by someone with good test equipment. Warren volunteered since he has a very nice setup and I'm sending him parts. My old Marconi from the 70's just won't cut it.

Both the 6x filter and 4x filter boards are dimensionally set up to accept the QRP Labs footprint plug-in LPF and BPF filters (1.5" x 0.5"). This is to allow users to use those LPFs or design their own. The QRP Labs LPFs will handle 10W, the QRP Labs BPFs won't according to Hans Summers. Since I wanted to use the components off the existing uBITX for the LPFs and Hans does not provide a "blank" LPF board, I laid one out (attached) .....works out to 16 LPFs per "standard" 100mm x 100mm panel. 

ALL the LPF components were moved over from the uBITX board, toroids and capacitors and placed in the same locations on the blank LPF boards. The relays can also be brought over but only on the 6x filter board because it's larger. I wanted the 4x LPF board to fit in the existing uBITX location so had to go to a smaller relay. I happen to have a qty of Omron G6H-2F relays but they are 5V so I'll have to regulate off 12V .....no problem. I'm sure there are similar sized relays out there that are 12V. 

Yes, the boards are all mine and I'll make the Gerber files available once it's determined that this will work. Someone may sign up to provide boards, parts, kits. .....or you can share with others.

The idea with the 4x LPF design is to use the existing Raduino code, no changes required. However, if the 15m/12m/10m LPF is changed to 12m/10m only .....and 15m is picked up on the 20m/17m LPF (see below plots) a
small change will be required. Just don't know yet.

Hope that answers your questions.

73 Kees K5BCQ

    

Re: Stone Soup

Allard PE1NWL
 

On Tue, Sep 4, 2018 at 10:30 PM, Robert D. Bowers wrote:
If I do anything amateur radio-wise, I may try to convert the BITX20 to 40m and fix the VFO so it doesn't drift.  I've always wanted a small, low to moderate power 40m monobander for mobile use.  That might raise some interest again.
In your case I would really recommend the BitX40 kit: Low-cost, rock-stable and FCC compliant.
With a few minimal mods you can add most of the features that commercial rigs have.
See https://github.com/amunters/bitx40

73 Allard PE1NWL

Re: K5BCQ uBITX Relay Switched LPF/BPF board

Arv Evans
 

Kees

If not already done, someone needs to tell Hans that he is about to get a lot more orders for
QRP-Labs filter boards.

Or...are you going to make bare boards available in the same form factor so that we can all
make our own filters that will plug into your filter board?

Arv
_._


On Tue, Sep 4, 2018 at 12:54 PM Kees T <windy10605@...> wrote:
73 Kees K5BCQ

Re: Ubitx version 4 speaker impedance?

R. E. Klaus
 

The TDA audio ic used in the earlier uBITX was designed to be used with 32 ohm headphones. The new version 4 has a different audio output stage that should be fine with 8 ohm and possibly 4 ohm speakers. Speaker diameter is just a matter of taste and what will fit the box you are using. 

Re: Stone Soup

Guy WB7SZI
 

Bob,
Great post!

Guy WB7SZI

Re: Stone Soup

Bill Cromwell
 

Hi Arv,

The real issue about those tunable traps is the raduino won't tune them. Or can it!? Much the same as a tunable preselector. Or plug-in one-at-a-time low pass filters. Doable yes. Make everybody happy? No.

73,

Bill KU8H

On 09/04/2018 04:53 PM, Arv Evans wrote:
Allison

Interesting. I have been experimenting with resistively loading series
LC traps and find
that they can be made broad enough to cover some tunable spurs without
seriously
decreasing the attenuation. They also seem to work better if installed
some place near the
middle of multiple pole filters.

In olden days we occasionally used tunable traps, but that doesn't seem
easily done with
today's compact rigs. Today traps are mostly relegated to trap-dipole
antenna designs.

But, to-each-his-own. Obviously they might not be for everybody.

Arv
_._


On Tue, Sep 4, 2018 at 8:31 AM ajparent1/KB1GMX <kb1gmx@...
<mailto:kb1gmx@...>> wrote:

Are we ignoring the possibility of using series LC traps to suck out
some of the bugs
(bug traps...?), 8-)

Arv,

No not ignoring them. They are generally useless as the assumption
is the
spur only happens here which is invalid, they are tunable you tune
they move.
For examplt the 10M spur for 28mhz its 17 and at 29.9999 its 15.0001
so if you are anywhere in between so is the spur somewhere in between.


reminder as it seems needed every 24 hours...

There are two issues:

Spurs that result from lack of filtering for bands over 20mhz.

Harmonics due to layout of the low pass filter switching for the
80/40/20 meter bands. (rewire the relays its fixed).

Since the topic is we are hams we do this stuff. If you whine
about pulling relays and removing tracks to fix the filter issue
I offer no sympathy. Do that or external filter, or nothing.

Allison





--
bark less - wag more

Re: stone soup ingredient list, what bands and modes are usable

Arv Evans
 

Bill

You are probably correct.  I do exchange emails occasionally with Farhan but he has
been quiet about what is next and when that may happen.  I think he has lots of other
activities going on in addition to HFSignals and other radio design projects. 

Some do not know that there was an earlier multi-band version of the BITX called a
Minima.  It was similar but possibly too minimalistic for what it was expected to do.

Arv
_._


On Tue, Sep 4, 2018 at 1:48 PM Bill Cromwell <wrcromwell@...> wrote:
Hi Arv,

It is more likely the work that is being discussed and done here will be
incorporated into a new version and not squelched the new version.

73,

Bill  KU8H

On 09/04/2018 03:08 PM, Arv Evans wrote:
---snip----
>
> Then there is the possibility that a new product version might be
> released and make all our
> work a wasted effort.  That may not be valid though in light of the
> large numbers of uBITX that
> have been distributed already.  These older versions will still need fixing.
>
> Arv K7HKL

--
bark less - wag more



Re: stone soup ingredient list, what bands and modes are usable

ajparent1/KB1GMX <kb1gmx@...>
 

Arv,

The repetition of material has reached the level of just one more time for something on the order of N>5.
When I get a chance I'll put it in the fine wiki.

Does anyone for spurs over 20mhz remember this:  45mhz - Dial frequency= SPUR ?????????????

For 80m harmonic try the formula dial Frequency * N, where N is 2 to 9.

Allison

Re: Stone Soup

Arv Evans
 

Bill

Probably depends on how much software is required versus how much room is available in
the Arduino RAM space.  Thoughts here run toward using frequency versus a look-up table
to set PWM output voltage to tune the traps.  Library based PWM gives 250 steps between
zero and 5 volts output, so possibly enough to tune a trap(s) over a significant range. 

Alternative that I mentioned to Allison is to use resistive loading to make the traps broad
enough to cover needed bandwidth.  That part is a bit tricky because it is a balancing act
between attenuation and bandwidth.

Arv
_._


On Tue, Sep 4, 2018 at 3:59 PM Bill Cromwell <wrcromwell@...> wrote:
Hi Arv,

The real issue about those tunable traps is the raduino won't tune them.
Or can it!? Much the same as a tunable preselector. Or plug-in
one-at-a-time low pass filters. Doable yes. Make everybody happy? No.

73,

Bill  KU8H


On 09/04/2018 04:53 PM, Arv Evans wrote:
> Allison
>
> Interesting.  I have been experimenting with resistively loading series
> LC traps and find
> that they can be made broad enough to cover some tunable spurs without
> seriously
> decreasing the attenuation.  They also seem to work better if installed
> some place near the
> middle of multiple pole filters.
>
> In olden days we occasionally used tunable traps, but that doesn't seem
> easily done with
> today's compact rigs.  Today traps are mostly relegated to trap-dipole
> antenna designs.
>
> But, to-each-his-own.  Obviously they might not be for everybody.
>
> Arv
> _._
>
>
> On Tue, Sep 4, 2018 at 8:31 AM ajparent1/KB1GMX <kb1gmx@...
> <mailto:kb1gmx@...>> wrote:
>
>     Are we ignoring the possibility of using series LC traps to suck out
>     some of the bugs
>     (bug traps...?),      8-)
>
>     Arv,
>
>     No not ignoring them.  They are generally useless as the assumption
>     is the
>     spur only happens here which is invalid, they are tunable  you tune
>     they move.
>     For examplt the 10M spur for 28mhz its 17 and at 29.9999 its 15.0001
>     so if you are anywhere in between so is the spur somewhere in between.
>
>
>     reminder as it seems needed every 24 hours...
>
>     There are two issues:
>
>     Spurs that result from lack of filtering for bands over 20mhz.
>
>     Harmonics due to layout of the low pass filter switching for the
>     80/40/20 meter bands.  (rewire the relays its fixed).
>
>     Since the topic is we are hams we do this stuff.  If you whine
>     about pulling relays and removing tracks to fix the filter issue
>     I offer no sympathy.  Do that or external filter, or nothing.
>
>     Allison
>
>
>
>
>
>

--
bark less - wag more



Re: stone soup ingredient list, what bands and modes are usable

Arv Evans
 

Allison

Thanks.  That could help others who can work on things but may not have the really
expensive test equipment to do final verification tests on their work.  It also could to
better inform those who are worrying about just how bad the situation might be.

Arv
_._


On Tue, Sep 4, 2018 at 4:15 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
Arv,

The repetition of material has reached the level of just one more time for something on the order of N>5.
When I get a chance I'll put it in the fine wiki.

Does anyone for spurs over 20mhz remember this:  45mhz - Dial frequency= SPUR ?????????????

For 80m harmonic try the formula dial Frequency * N, where N is 2 to 9.

Allison

Re: K5BCQ uBITX Relay Switched LPF/BPF board

Kees T
 

I'll make the Gerbers available after they have been tested. These board suppliers who offer the "10 of the 100mm x 100mm boards for $2? plus scoring and shipping" may also receive a "bubble" of orders.  As I mentioned earlier that's 160 blank LPF boards so sharing might be a good idea.

73 Kees K5BCQ

Re: Stone Soup

ajparent1/KB1GMX <kb1gmx@...>
 

Arv,

Anyone that thinks they can make a trap that works over a 2mhz range is
also selling bridges.  The trap fpr 10M alone would ahve to snuff 15-17mhz.

When you get to that point a band pass filter is easier and works better.
But I repeat myself, again again again again again....

That does not help 12M with the echo at 20mhz and the 15M spurs
around 23mhz.

Allison

Re: VK4PP uBitx LPF BANK add-on Board

Nick VK4PP
 

Ok.
Ive ordered 10 boards for testing.

I will also try to get it working in combintation with a QRP-Labs relay board and BPF in the 30Mhz LPF spot for spur reduction.

Effectively turning it into a 5 band radio. 80/40/20/15/10, as per band pass filters. and then the new LPF board for Harmonics.

At this point just reusing the existing LPF filters, but I suppose you can match them to your BPFs for better harmonic response on each band....

Thoughts?
 

Re: Does anyone have an AGC/Click kit to sell?

Eddie Esserman
 

So, I received Sunil's AGC kit (back in production now) today.  Anyone know how to hook the thing up to a V3 ubitx while I heat the dummy load until we resolve the issues.  Actually it's one good receiver, looking forward to getting the AGC onboard.

Eddie

Re: Does anyone have an AGC/Click kit to sell?

Nick VK4PP
 

just a note to anyone still looking for the ND6T AGC, I have plenty of through hole boards:
https://vk4pp.blogspot.com.

73 Nick VK4PP.