Let's take the subject of Arduino Programming.
There are literally dozens of published books about that subject. If you look at the Table of Contents, they all cover the same thing. How many do you need to buy to get started with Arduino Programming?
That is why I recommend using your local PUBLIC LIBRARY to find books. If your local PUBLIC LIBRARY doesn't have the book in its collection, then inquire about the INTERLIBRAY LOAN SERVICE. Your local librarian will be happy to help you use the service.
One way to find books in a library is to search World Cat. One feature of World Cat is that they will list libraries that have the book. For example, look for Experimental Methods in RF Design at World Cat. You will get a page of search results. Clicking on the top search item you are taken to the book's page. Scrolling down, there is a box labeled: Enter your location:Type in your ZIP code and libraries close to that will be displayed. This is an excellent way to find out-of-print books. My local library will allow me to check out a book for 21 days. I can renew the book up to four times, if there are no holds on it. The INTERLIBRARY LOAN service can obtain books from out--of-state if there are no copies of the book in-state. It is very rare that the library cannot find and loan a book to me.
PUBLIC LIBRARIES are NOT against the law.They are probably one of the BEST ways your taxes are used. It is a great way to find a book about Arduino Programming without buying a dozen books that all cover the exact same stuff. Often books go out-of-print, and the Publisher will not reprint it. The PUBLIC LIBRARY is a great way to find and borrow such a book. I encourage everyone to use their local PUBLIC LIBRARY. If you don't have a library card, get one at your local branch library. Here is a recent experience I had using my local PUBLIC LIBRARY.
There is a book called The Electronics of Radio by Rutledge.
It uses the Norcal40A as the radio for experimentation.
I decided I wanted to take a look at it.
It starts out at $35+ USD for a used copy. (See: )
So I used the PUBLIC LIBRARY's INTERLIBRARY LOAN SERVICE.
The book arrived in a couple of weeks from a University Library.
It was evident to me right off the bat that the content of the book
was way over my head. I sure am glad I didn't spend $35 to find that out.
When I do find a book at my local public library that clicks with me,
then I usually try to find a used copy of the book,using
if I want a copy on my own bookshelf. But I can say from experience
that not ALL the books on any given subject are good books. Sometimes
they just don't resonate with me. I do not buy copies of those books.
Summary: Use your local PUBLIC LIBRARY !!!
Even small towns usually have a branch library.
And the INTERLIBRARY LOAN SERVICE makes any branch, large.
Regards, Ken, KM4NFQ
On Thu, Jul 6, 2017 at 9:12 AM, Peter Parker <parkerp@...> wrote: Another one I recommend (though more for the theory than practical side) is Ron Bertrand's Radio Theory Handbook.?
This takes you from basic to advanced, going a bit higher than our exam requirements.?
A review I did is at?
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Re: BITX40 Microphone options
I use the supplied mic insert on a old ?pen ?works we'll I use PTT on the radio?
On 6 Jul 2017 15:25, "Raj vu2zap" < rajendrakumargg@...> wrote: What Bitx40 needs is an extra amp stage for the mic.
With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.
If you are adventurous try a preamp for the mic with mods and a mic drive control for better control.
An opamp with gain control is better suited for the bitx40. If you don't want to disturb the Bitx40 board then
use a capacitor to couple a preamp.
Raj
At 06/07/2017, you wrote:
>If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.
>
>Described in this video:
>
>
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Re: BITX QSO Night, Sunday, July 16, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Sorry, posted with the wrong date!? This Sunday, July 9 and every Sunday is BITX QSO night.
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BITX QSO Night, Sunday, July 16, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
BITX QSO Night, Sunday, July 16, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!
To participate, call CQ BITX at 7pm sharp, your local time, on Sunday. Call off and on for about 15 minutes. It is helpful if you call CQ BITX with your name and location.? Repeat your call a number of times if conditions are weak.
This is a worldwide event at 7pm in each time zone.? You may participate in any time zone, regardless of your location, so you may wish to call in at 6pm, 7pm and 8pm, your local time, to contact hams in adjacent time zones.
The backup frequency in case of QSB or other noise is 7210 kHz.
Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.
This is an undirected, scheduled event.? The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls at 7pm on Sunday.? Talk to you then!
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Re: BITX40 Microphone options
What Bitx40 needs is an extra amp stage for the mic.
With my lung capacity down I can't do "haaaaloo" level of yelling anymore so I am using an amped motorola mic.
If you are adventurous try a preamp for the mic with mods and a mic drive control for better control.
An opamp with gain control is better suited for the bitx40. If you don't want to disturb the Bitx40 board then
use a capacitor to couple a preamp.
Raj
toggle quoted message
Show quoted text
At 06/07/2017, you wrote: If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.
Described in this video:
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
El 05/07/17 a las 23:39, Kevin
escribi¨®:
Pavel,
Since the linear potentiometer tuning function is now moved to a
library, would it be possible, as a compile option, build with a
rotary encoder library?
Thank you for all you work!
73, Kevin KB3OMM
_._,_._,_
Yes, that's one of the goals...
73 Pavel CO7WT.
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Re: what distance have you logged
About 1200 miles / 1930 km - Dallas, Texas to North Carolina. I don't have the call handy.
CDX have been not as good since.
Mike Yancey, KM5Z
Dallas, Texas, USA
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Re: BITX40 Microphone options
If compactness is essential you could use the supplied element and put it in case with the end-cap for the BNC antenna connector (also supplied). As it happens the microphone element fits snugly in. You can pierce two holes in the plastic and use a small press switch (might even have been supplied with the Bitx) for the PTT.?
Described in this video:?
https://www.youtube.com/watch?v=CqybyZkAoUo
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Re: dipole antenna changes, big improvement
What are you using for feed line?
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Re: what distance have you logged
Nice contacts peter I found someone broadcasting music on 7.1779 LSB its on my ICOM ic745 as we'll as my bitx ?its coming from euro land its bad I know but I am enjoying the music lol its old music?
On 6 Jul 2017 14:07, "Peter Parker" < parkerp@...> wrote: I've worked ZL4AU from VK3. ? 2121km or 1318 mi.?
Conditions weren't great and it was hard going.?
Here's a video
From here I find that VK6 and ZL (both over 2000km) are often workable with QRP gear like the Bitx. But further distances are much harder.?
?
?
?
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Another one I recommend (though more for the theory than practical side) is Ron Bertrand's Radio Theory Handbook.?
This takes you from basic to advanced, going a bit higher than our exam requirements.?
A review I did is at?
https://www.youtube.com/watch?v=up_38RYEVXk
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Re: what distance have you logged
I've worked ZL4AU from VK3. ? 2121km or 1318 mi.?
Conditions weren't great and it was hard going.?
Here's a video
From here I find that VK6 and ZL (both over 2000km) are often workable with QRP gear like the Bitx. But further distances are much harder.?
?
?
?
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
On Thu, Jul 6, 2017 at 04:06 am, Michael Babineau wrote:
I suspect that if you change the values of the following two "Defines" in Allard's sketch, recompile and update your Raduino, you can customize the tuning to your liking :
| #define LOWEST_FREQ (6990000UL) // absolute minimum frequency (Hz) |
| ? |
| #define HIGHEST_FREQ (7500000UL) // absolute maximum frequency (Hz) |
| ? |
Yes, I've been doing that to every version that has come out. I set them to 6999 and 7300.?The shuttle tuning still goes slightly past those limits, but not ridiculously far. ? -- John - WA2FZW
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Re: BITX40 Microphone options
On Mon, May 15, 2017 at 07:25 am, pat griffin wrote:
I have had good results with an aviation headset with a 2.2k resistor in series with the mic.
And I took Pat's advice and set mine up to use?an aviation headset (since I have a bunch of them). I'm using a David Clark H-10-13.4 and it works?great. I also bought a cheapie computer desk microphone and modified the base by adding a round piece of plywood to allow vertical space for a PTT switch. The element in that mic looks identical to the one that came with the kit.  ? -- John - WA2FZW
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Re: what distance have you logged
my call ? ? ? VA2NB
date?????????? 2017/07/06
time ? ? ? ? ? ?00:58 utc
freq???????????? 7.156 Mhz
mode????????? ssb
his call ? ? ? ?YU7XX
distance ? ? 4375 miles (7041 Km)
Michael VE3WMB / VA2NB
P.S. My antenna is a 204 foot doublet at 50 feet.?
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
Wow .. the early bird gets the worm ... it looks like I am not the only VE3 up early. ? Al beat me to it ;-)?
Michael VE3WMB?
toggle quoted message
Show quoted text
On Thu, Jul 6, 2017 at 04:06 am, Michael Babineau wrote:
Mike :
I suspect that if you change the values of the following two "Defines" in Allard's sketch, recompile and update your Raduino, you can customize the tuning to your liking :
| #define LOWEST_FREQ (6990000UL) // absolute minimum frequency (Hz) |
| ? |
| #define HIGHEST_FREQ (7500000UL) // absolute maximum frequency (Hz) |
| ? |
Cheers
Michael VE3WMB?
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
Mike : I suspect that if you change the values of the following two "Defines" in Allard's sketch, recompile and update your Raduino, you can customize the tuning to your liking :
| #define LOWEST_FREQ (6990000UL) // absolute minimum frequency (Hz) |
| ? |
| #define HIGHEST_FREQ (7500000UL) // absolute maximum frequency (Hz) |
| ? |
Cheers Michael VE3WMB?
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
I always change the lines:
| #define LOWEST_FREQ (6990000UL) // absolute minimum frequency (Hz) |
?# define HIGHEST_FREQ ( 7500000UL) // absolute maximum frequency (Hz)
to a LOWEST_FREQ of 7000 and a HIGHEST_FREQ of 7300 before I upload it to the Raduino. This limits how far outside the band it runs up/down. Other values can be used if desired.
73, AL VE3RRD
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Re: Bitx40 Pavel's blend sketch updated (the Allard's folk one with S-Meter, TX-meter, AGC)
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Re: what distance have you logged
With my bitx 40 ?& battery and 1/4 wave vertical my best contacts are? 24/06/17. ? 7.182. EF9R range 1319 miles with 5 watts? 02/07/17. ?7.151.? YL3CW ?range 1039 miles. With 5 watts Holding to work the USA sometime when The kW boys are not around to take over
hi all
conditions are not good for me with long skip into france or germany where i am competing with big pa's , foreign language and noise.
i have made one contact when there was short skip. details below.
my call?????? gm4dso
date?????????? 2017/06/23
time??????????? 18:49 utc
freq???????????? 7.174
mode????????? ssb
his call??????? g4vsj
distance???? 195.5 miles
What have you acheived
terry gm4dso
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Raj vu2zap