QRZ! Ham Radio 3/QRZ Ham Radio Callsign Database - Volume 3.iso/digests/homebrew/930150.txt

Internet Message Format | 1994-06-04 | 15KB

Date: Sat,  1 Jan 94 04:30:27 PST
From: Ham-Homebrew Mailing List and Newsgroup <[e-mail]>
Errors-To: [e-mail]
Reply-To: [e-mail]
Precedence: Bulk
Subject: Ham-Homebrew Digest V93 #150
To: Ham-Homebrew


Ham-Homebrew Digest         Sat,  1 Jan 94       Volume 93 : Issue  150

Today's Topics:
                     80 M DSB transceiver project
                                close
                       Crystal filters (2 msgs)
                    HELP - Need Mot MOCOM 70 info
                        How to use the XR2211?
                   Looking for information (4 msgs)
                            Low Budget CB
               Who Makes Wideband RF Modules?? (2 msgs)

Send Replies or notes for publication to: <[e-mail]>
Send subscription requests to: <[e-mail]>
Problems you can't solve otherwise to [e-mail].

Archives of past issues of the Ham-Homebrew Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-homebrew".

We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party.  Your mileage may vary.  So there.
----------------------------------------------------------------------

Date: 31 Dec 1993 22:17:09 GMT
From: usc!howland.reston.ans.net!noc.near.net!chaos.dac.neu.edu!chaos.dac![e-mail]
Subject: 80 M DSB transceiver project
To: [e-mail]



.

------------------------------

Date: Fri, 31 Dec 93 10:06:42 CST
From: library.ucla.edu!agate!iat.holonet.net!vulcan![e-mail]
Subject: close
To: [e-mail]

The XR-2206 is a function generator, it can be used to transmit FSK data,
but not to decode it.  I am looking at a spec sheet on the chip right
now.  If you want to decode, you need another chip.  Are you wanting to
decode data from HF or VHF ?  If VHF, you could get by with a PLL.

On HF, you have impairments that do not generally show up in VHF, so you
probably want something better than a PLL.  A good reference for HF data
modems (I should say a good starting point) is an article by Dr. Alan
Chandler of AEA, Inc.  in the Spring 1991 issue of Communications
Quarterly.

Good Luck and 73's

Gary Tennyson
KO4CY
[e-mail]
[e-mail] writes:

> Hi,
>  I am trying to design a data decoder, can anyone advise me on whether
> to use NE567 or the XR2206? Which is better and how do I use the XR2206 FSk
> chip? Docs? Specs? Tks.
>
> 73s de 9VG Daniel


Gary Tennyson
[e-mail]

------------------------------

Date: 31 Dec 93 13:56:16 GMT
From: [e-mail]
Subject: Crystal filters
To: [e-mail]

I'm looking for a source of crystal filters for a superhet receiver I'm
working on.  Rather than matching crystals and building one myself, I'd rather
just buy one off the shelf.  What rigs use 9.0 MHz IFs now?  I see that my
735 has a few near there, but not quite, and I really want to use a filter
designed for a 9MHz IF.

Any advice where I can find them or at least what modern rigs use 9MHz IFs?

Thanks,
Bob

------------------------------

Date: Fri, 31 Dec 1993 18:20:13 GMT
From: swrinde!emory!kd4nc!ke4zv![e-mail]
Subject: Crystal filters
To: [e-mail]

In article <[e-mail]> [e-mail] (Bob Applegate) writes:
>I'm looking for a source of crystal filters for a superhet receiver I'm
>working on.  Rather than matching crystals and building one myself, I'd rather
>just buy one off the shelf.  What rigs use 9.0 MHz IFs now?  I see that my
>735 has a few near there, but not quite, and I really want to use a filter
>designed for a 9MHz IF.

Spectrum International carries 9 MHz filters, and the necessary crystals.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | uunet!rsiatl!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244     |                     |

------------------------------

Date: 31 Dec 1993 18:44:34 -0600
From: usc!cs.utexas.edu![e-mail]
Subject: HELP - Need Mot MOCOM 70 info
To: [e-mail]

Anybody have any sources for Motorola manuals for the MOCOM 70 Model number
U33BBA1000A mobile transciever? Any conversion info?

Thanks in advance
Joe - AA3GN
--
Joe Landis - Systems/Network Mgr.
North American Drager, Telford, PA

------------------------------

Date: Fri, 31 Dec 1993 16:42:53 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!newsserver.jvnc.net!newsserver.technet.sg!ntuix!ntuvax.ntu.ac.sg![e-mail]
Subject: How to use the XR2211?
To: [e-mail]

Hi,
 Can anyone help me with the XR2211 PLL chip from EXAR? I need specs,
data, pinouts, schematics etc. Need it for decoding RTTY/CW/AMTOR/SITOR/WWV
etc. How fast will it go? Tks in advance.

Daniel

------------------------------

Date: Fri, 31 Dec 93 16:31:32 GMT
From: netcomsv!netcomsv!bongo!skyld![e-mail]
Subject: Looking for information
To: [e-mail]

Doesn't anyone read books any more?
Doesn't anyone go the the library and look for something themselves?
Doesn't anyone look in technical publications for information?

What is it about the internet that seems to breed the following attitude?

            "I don't want to expend the effort to
            look so can someone else do it for me?"

Along a similar thread, how is it that no one seems to think of the
manufacturers as a source of information?

Are you people really that cheap, lazy or stupid?

Not that the ARRL amateur radio handbook is the be all to end all,
but it is two inches thick for a reason. Likewise, QST is loaded
full of advertisements. (As several others complain about.)

Dialing 411 (In the US) gets you directory assistance. Dialing
1 (area code) 555-1212 gets you directory assistance for any other
area code. Dialing 1 800 555-1212 gets you the free number directory
assistance for those of you too cheap to call someone direct.

Now I know there are a lot of obscure technical aspects to amateur
radio, but geeze people. Get off of your tail ends and look around
a bit before you waste every one elses time.

And before the self appointed guardians of the net jump on me about
the remark of wasting my time, consider this, I don't think there are
any stupid questions. But there sure are a lot of unnecessary ones.

73 es GM from Jeff


 Amateur: WA6FWI@WA6FWI.#SOCA.CA.USA.NA  |  "It is difficult to imagine our
Internet: [e-mail]          |  universe run by a single omni-
 US Mail: PO Box 4425 Carson, CA 90749   |  potent god. I see it more as a
   Phone: [phone]               |  badly run corporation."

------------------------------

Date: 1 Jan 1994 01:43:41 GMT
From: sdd.hp.com!hpscit.sc.hp.com![e-mail]
Subject: Looking for information
To: [e-mail]

In article <[e-mail]>,
Jeffrey D. Angus <[e-mail]> wrote:
>
>Doesn't anyone read books any more?
>Doesn't anyone go the the library and look for something themselves?
>Doesn't anyone look in technical publications for information?
>
>What is it about the internet that seems to breed the following attitude?
>
>            "I don't want to expend the effort to
>            look so can someone else do it for me?"
>
>Along a similar thread, how is it that no one seems to think of the
>manufacturers as a source of information?

I assume this is in reference to the fellow from Singapore who
asked about the XR2211. You basically have it right.  The EXAR
data book pretty much will tell him everything there is to know about
the 2211 including in-what-way it is better than the NE567.
Having studied this area extensively, I can also say that I don't
know of anything better than the 2211 for *normal* FSK.  Note
that ham radio uses wide-shift FSK, which is a special case.

Rick Karlquist N6RK
[e-mail]

------------------------------

Date: 1 Jan 1994 02:00:17 GMT
From: galaxy.ucr.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!usenet.ins.cwru.edu!odin![e-mail]
Subject: Looking for information
To: [e-mail]

The preceding article "Looking for information" is flame-bait.  Maybe I
am thinking wishfully, but it would be nice if we could keep responses
in e-mail rather than watching another silly flame war erupt over
nothing.  Thanks...

       Stephen

--
Stephen Trier  KB8PWA
Work: [e-mail]
Home: [e-mail]

------------------------------

Date: 31 Dec 1993 19:46:18 -0800
From: nntp.crl.com!crl2.crl.com![e-mail]
Subject: Looking for information
To: [e-mail]

Jeffrey D. Angus ([e-mail]) wrote:

: Doesn't anyone read books any more?
: Doesn't anyone go the the library and look for something themselves?
: Doesn't anyone look in technical publications for information?

No flame here, but please consider the following:

     As a practicing engineer, I find that I can pretty well get whatever
information I want by calling a vendor and requesting catalogs or ap
notes.  Before college, however, information was not that easy to come
by.  I would not have known how to obtain an Exar data book, for example.
Hell, parts were a problem too.  I remember pulling resistors out of scrap
television sets.

: Are you people really that cheap, lazy or stupid?

     Hmmmm..."You people"... what a generality!  If that is your
impression of the subscribers to this group, feel free to go elsewhere.
Consider that the first-time experimenter may want to try out a simple
project before he sinks his moola into databooks or the ARRL tome.  The
local library may not have the databooks he needs.
     I have never purchased a component data book in my life (although I
do buy the ARRL handbook every few years.)  I get them for free.  Many
times my old ones find homes with budding experimenters.  The
Heathkit/Lafayette era is gone: homebrewing is almost dead and I feel it
needs to be nurtured.  I for one will continue to read the messages with
titles like: Need help...--You, of course are free to skip them!

: Not that the ARRL amateur radio handbook is the be all to end all,
: but it is two inches thick for a reason. Likewise, QST is loaded
: full of advertisements. (As several others complain about.)

     These are valid points, but don't you remember ever getting enthused
about a project and wanting the answer NOW?  Of course, it is possible to
go to the library and get the information in the next day or two, but the
net environment is such that someone might have an answer for you in a
few hours!  Of course, anyone really into the hobby will want a copy of
the ARRL handbook, but someone just starting to dabble may bawk at the
$25 price tag.

: Dialing 411 (In the US) gets you directory assistance.
Dialing
: 1 (area code) 555-1212 gets you directory assistance for any other
: area code. Dialing 1 800 555-1212 gets you the free number directory
: assistance for those of you too cheap to call someone direct.

     What if you don't know the area code?   :)

: Now I know there are a lot of obscure technical aspects to amateur
: radio, but geeze people. Get off of your tail ends and look around
: a bit before you waste every one elses time.

     Jeff, of course all your points are valid in various degrees, but
try to be a bit more of an Elmer, huh?

: the remark of wasting my time, consider this, I don't think there are
: any stupid questions. But there sure are a lot of unnecessary ones.

     Yeah, I'm a Staff Engineer for a Consumer Giant that hires some
engineering fresh-outs from time to time.  Not a day goes by that I don't
have similar thoughts.  There are many other resources available besides
me for their questions, but it is probably good old human nature that
makes one search the path of immediacy -- sometimes they will be forced
to use the other avenues however --  No matter how many years I practice
engineering the answer is sometimes " I don't know".

73's    Don Miller   KM4AS    [e-mail]

------------------------------

Date: 31 Dec 1993 22:19:23 GMT
From: usc!howland.reston.ans.net!noc.near.net!chaos.dac.neu.edu!chaos.dac![e-mail]
Subject: Low Budget CB
To: [e-mail]

Hi:
 I'm in the market for an inexpensive CB to start in this hobby. Anything out there for sale?

-Dean

------------------------------

Date: 31 Dec 1993 13:19:12 GMT
From: news.larc.nasa.gov!grissom.larc.nasa.gov![e-mail]
Subject: Who Makes Wideband RF Modules??
To: [e-mail]

In article <[e-mail]> [e-mail] (Galen Watts) writes:
>Maybe I should have said '... besides Motorola.'  I have their books,
>but who else makes RF amp modules working 10-500 MHz with a few watts
>output, and what are their phone numbers for literature?

Philips makes some nice ones too, which may even be available as ECG
replacement parts.  They aren't as promiscuous with free samples as
Motorola is, though.
--scott
--
"C'est un Nagra.  C'est suisse, et tres, tres precis."

------------------------------

Date: Fri, 31 Dec 1993 17:47:10 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!math.ohio-state.edu!cyber2.cyberstore.ca!nntp.cs.ubc.ca!newsserver.sfu.ca!sfu.ca![e-mail]
Subject: Who Makes Wideband RF Modules??
To: [e-mail]

[e-mail] (Scott Dorsey) writes:

>In article <[e-mail]> [e-mail] (Galen Watts) writes:
>>Maybe I should have said '... besides Motorola.'  I have their books,
>>but who else makes RF amp modules working 10-500 MHz with a few watts
>>output, and what are their phone numbers for literature?

>Philips makes some nice ones too, which may even be available as ECG
>replacement parts.  They aren't as promiscuous with free samples as
>Motorola is, though.
>--scott
>--
>"C'est un Nagra.  C'est suisse, et tres, tres precis."

Also Mini-Circuits. [phone]

------------------------------

End of Ham-Homebrew Digest V93 #150
******************************
******************************