Re: what distance have you logged
For SSB about 1980 miles to KL7CWN with 5w and 80 meter ocf dipole at about 25 feet. On wspr I logged AU at 9246 miles.?
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A very good site, kits, tings to build, and books to download.
Just a note on this file.? NOWHERE IN THE FILE is the name of the book mentioned!!!!? I hadda write to ARRL to find out the name of the book.? I bought the book.? Now, I have little time to read it! Joe W3TTT
Chapter ONE of Experimental Methods in RF Design (EMRFD) is available at:
--
73, Joe W3TTT
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Re: dipole antenna changes, big improvement
Did you have it up when I talked to you last week? That was the
first
time that I heard you since we started the group. I too have an
inverted vee up 50'
Ed W0OIC
On 7/5/2017 8:50 PM, KC8WBK via
Groups.Io wrote:
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Show quoted text
I added a support
line to the middle of my dipole and went from a sagging dipole at
35 feet to an inverted vee at 50 feet.? This is a big improvement,
because I rarely heard stations out west before, and I just had a
long conversation with a operator in Nevada.? Wow, now I want to
put it up even higher.
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BITX QSO Night, Sunday, July 9, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
BITX QSO Night, Sunday, July 9, 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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To beat this poor old dead horse a little more. ?Back in the 80s Borland got it right with Turbo Pascal. ?Back then Microsoft was charging something like $500 for a compiler and copy protection wasn't like it is today. ?Borland introduced Turbo Pascal for
something like $49 or $99 with manuals, etc. ?In other words it was so cheap that you would buy it to get the manuals, etc. ?Even though you could get a pirated copy there was enough value added such that pirating was a trickle and Borland could ignore it.
?It is a similar model for Fedora and RedHat. ?If you want the free version, download Fedora and?have at it. ?But if you want support, etc buy RedHat.
As for books, it is a bit more tricky. ?In my case, here in geezerville, I much prefer a nice book that I can mark in, etc, so, that is enough value add for me. ?I'm pretty sure I am in the minority. ?I know there are some value adds that come with books
such as DVDs and I guess that helps a bit. ?But, I think the solution is a price point and clever value add such that for, say 80% of the market, the real thing is worth it.
And, by the way, Jack's book is way?worth it.
73,
Pat AA4PG
Pat Griffin
http://www.cahabatechnology.com/aa4pg.html
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I appreciate your comments, Andrew, especially since there are literally hundreds of sites where my books are being given away free. My daughter works
at a major publishing house and they have three people on staff whose only job is to find such sites and have the legal department issue cease and desist orders. It's like trying to divert Niagara Falls with a bucket.?
I enjoy writing. If I didn't, I would have stopped years ago because, financially, it's no longer worth it. And therein is the problem. Good authors who
depend on writing income can no longer afford to write. Books that would have brought knowledge, pleasure, and joy to thousands simply won't be written. ?If a new author gets lucky and gets a book published and it is successful, it is quickly copied and neither
the author who did the work nor the publisher who took the risk, are rewarded. It doesn't take an economist to figure where that goes.
Clearly, it is tempting to download a book that you want and not have to pay for it. As I stand here with my bucket, I know there's nothing I can do to
stop those people who make our property available for download. Given that, my position is: If you take my book and read it and feel that you have benefited from it, then go out and buy a copy. It's as close to a win/win as we're going to get. You get the
read the book risk free and, if I've done a good job for you, you end up paying me in the end. I also feel that those who do that actually feel better having paid for the book.
Telling you not to download a free book probably isn't going to sway anyone. However, if it turns out to help you, you should help that person in return.
Jack, W8TEE
From: Andrew Krause <andrew.krause@...>
To: [email protected]
Sent: Tuesday, July 4, 2017 5:15 PM
Subject: Re: [BITX20] A Good Book
I just want to say that I have a hard time with people posting PDF links to in-print material that is copyrighted. Someone worked very hard to create a text to educate others. They're entitled to profit from that.
Furthermore, this knowledge has value, and is worth paying for.?
It appears that this single chapter is made freely available, so no foul here. But the other day someone posted an entire scanned PDF of a book. What are the groups rules on this??
On Tue, Jul 4, 2017 at 4:50 PM Ken KM4NFQ < km4nfq@...> wrote:
Chapter ONE of Experimental Methods in RF Design (EMRFD) is available at:
More on the first transmitter here:
and more stuff related to EMRFD here:
The latest iteration of EMRFD is the Classic Edition.
A CD-ROM is included with two additional Classic Editions
(scans of printed books in PDF format) written by Wes Hayward, W7ZOI.
Solid State Design for the Radio Amateur (1986)
Introduction to Radio Frequency Design (1994)
SSDRA is the precursor of EMRFD.
IRFD is Maths intensive.
Regards,
Ken, KM4NFQ
--
Andrew Krause
General Class Amateur Radio License: KM4ZJO
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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!
|
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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ekelley
Raj vu2zap