http://www.radiobanter.com (rec.radio.amateur) Covering amateur radio construction and experimentation. en Sat, 21 Nov 2009 01:38:59 GMT vBulletin 60 http://www.radiobanter.com/images/002/misc/rss.jpg http://www.radiobanter.com http://www.radiobanter.com/showthread.php?t=147928&goto=newpost Thu, 12 Nov 2009 14:52:37 GMT Hi folks.

Any Toronto all-grain brewers want peated malt? I'm not brewing these
days, but I can whip up some peated malt for those that could use some
in a test brew. I used some at my professional brewery some time
back, but since it was shipped from the UK and moved around somewhat,
it didn't impart too much flavour.

In any case, let me know if you are interested.

Cheers
]]> Homebrew BeeRich http://www.radiobanter.com/showthread.php?t=147928 http://www.radiobanter.com/showthread.php?t=147809&goto=newpost Sat, 07 Nov 2009 19:02:45 GMT Does anyone have the schematic of the Pasokon SSTV interface board please? Mine (interface) has developed a fault and I want to fix it. Thanks. Howard. Does anyone have the schematic of the Pasokon SSTV interface board please?
Mine (interface) has developed a fault and I want to fix it.
Thanks. Howard.


]]> Homebrew Howard James http://www.radiobanter.com/showthread.php?t=147809 http://www.radiobanter.com/showthread.php?t=147801&goto=newpost Sat, 07 Nov 2009 14:47:00 GMT
You maybe knowing your microwave's inner workings.
It uses a microwave valve which consists of LC chambers of 2.4 GHz.
And they are excited with a dc hv of must be 50 Hz.

Now we have two possibilities, the output is in trains or constant rf output.

Who of the hams here can messure that output ?

]]> Homebrew Jonatan http://www.radiobanter.com/showthread.php?t=147801 http://www.radiobanter.com/showthread.php?t=147606&goto=newpost Fri, 30 Oct 2009 17:40:47 GMT I'm using the wein bridge to generate audio tones that are fed to the
transmitter for digital radio communication (basically a homebrew ASK
radio modem). I'd be open to using that, but I'm not aware of any
radio modems that output square waves.

This oscillator also has 2 digital pots attached: 1 to trim the space
tone, and 1 to trim the mark tone. There's a high speed switch
between the two pots to rapidly switch between mark and space tones.
I could use this same setup with a 555 and trim the resistor to vary
the pulse duration, but I'm not sure what impact a square wave would
have on transmission, reception, decoding, etc...?

Has anyone heard of a square wave being used as an audio tone for
digital radio communication?

Thanks in advance,
Dave

On Oct 30, 12:06*pm, George Herold > wrote:
> Hmm I have no idea if that will make any difference. *What are you
> using to control the feedback? *Can you use a more robust oscillator
> (as John suggested) Some type of 'bang-bang' rather than sitting on
> the 'knife-edge' of oscillation with the Wein bridge. *I needed the
> low harmonic distortion of the Wein bridge... Is that what you need?
>
> George H.

]]> Homebrew dave.harper http://www.radiobanter.com/showthread.php?t=147606 http://www.radiobanter.com/showthread.php?t=147535&goto=newpost Tue, 27 Oct 2009 09:50:49 GMT Anyone know where I can get a CA-5484 (that's a manufacture part no.
not Realistic I think it says matsumi on the top of the can)osc coil
from a Realistic DX100 receiver it's 1.6-4.5 MHZ it looks like the old 6
transistor radio can transformer.
]]> Homebrew mark http://www.radiobanter.com/showthread.php?t=147535 http://www.radiobanter.com/showthread.php?t=147515&goto=newpost Mon, 26 Oct 2009 14:02:57 GMT HI,
I'm building the ADC-40 made by KD1JV.
I would like to know what kind of 10.7 FI is used as filter because there
are several type of FI with different characteristics spotted by different
color.

Could someone tell me the color I need ?

Thanks a lot.

Here the link of ADC-40 : http://kd1jv.qrpradio.com/ADC/ADC-40.htm

72


]]> Homebrew http://www.radiobanter.com/showthread.php?t=147515 http://www.radiobanter.com/showthread.php?t=147499&goto=newpost Sun, 25 Oct 2009 13:41:04 GMT Yep, this is an off-the-wall question..... Paging through an old QST, it dawned on me that when schematics are drawn, usually the earliest stages are drawn on the left side of the diagram. The speech input circuits for a voice transmitter; the antenna coupling and RF preamp (if any) for a... Yep, this is an off-the-wall question.....

Paging through an old QST, it dawned on me that when schematics are drawn, usually the earliest stages are drawn on the left side of the diagram. The
speech input circuits for a voice transmitter; the antenna coupling and RF preamp (if any) for a receiver, etc., all seem to be drawn on the left.

In the tube days at least (and to some degree with solid-state homebrew today) we seem to build the actual equipment the same way: the earliest stages
are physically on the left side of the gear.

Of course, in Western culture we also read and write from left to right. I suppose we learn to look for the beginning of a story on the left side of
the page.


And of course, in some other cultures, people read and write from *right to left*.

When people from these cultures become involved in radio, do they draw schematics (and build gear?) in the same direction Westerners do? Or do they
work "backwards"?

--

Doug Smith W9WI
Pleasant View, TN EM66
]]> Homebrew sorry-spammers http://www.radiobanter.com/showthread.php?t=147499 http://www.radiobanter.com/showthread.php?t=147455&goto=newpost Thu, 22 Oct 2009 23:44:41 GMT Hi I have the Delhi selfsupporting tower, it is 48ft tall I believe, an old ham tower. It has the top piece plate but I need the plate that is about 5 ft down. The previous owner of the tower made some home made ones for each 1/3 length of the tower but now I need the replacement for the one plate... Hi
I have the Delhi selfsupporting tower, it is 48ft tall I believe, an old ham
tower. It has the top piece plate but I need the plate that is about 5 ft
down. The previous owner of the tower made some home made ones for each 1/3
length of the tower but now I need the replacement for the one plate that I
can connect the angle brackets that hold the u bolts that hold the masting.
I went to to a local tv distributor now who sells the tower but not the
replacement parts. I also need those angle brackets. I am in Southern
Ontario. Any ideas where there are shops or ham fests in this area soon?

Thanks

]]> Homebrew http://www.radiobanter.com/showthread.php?t=147455