QRZ! Ham Radio 5/QRZ Ham Radio Callsign Database - Volume 5.iso/digests/homebrew/940248.txt

Internet Message Format | 1994-11-13 | 19KB

Date: Tue, 23 Aug 94 04:30:26 PDT
From: Ham-Homebrew Mailing List and Newsgroup <[e-mail]>
Errors-To: [e-mail]
Reply-To: [e-mail]
Precedence: Bulk
Subject: Ham-Homebrew Digest V94 #248
To: Ham-Homebrew


Ham-Homebrew Digest         Tue, 23 Aug 94       Volume 94 : Issue  248

Today's Topics:
                   Band trap filter designs wanted!
                          building questions
                    DME (Dog Measuring  Equipment)
                Ham-Homebrew Digest V94 #245 (2 msgs)
                        help with crystal set?
                  Portable EME Station -- Questions
                     Subject: Reed Relays for RF
   WANTED: Source for Signetics NE604 or SA604 IF/FM detector chip

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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: Mon, 22 Aug 1994 18:19:38 GMT
From: ihnp4.ucsd.edu!news.service.uci.edu!ttinews!avatar![e-mail]
Subject: Band trap filter designs wanted!
To: [e-mail]

 Im looking for a "band trap" filter design, it should begin
attenuating at or near 26 MHz, have very steep skirts, be of
a 9 or 11 pole design, so that the filtering is at least 90dB,
and the upper cutoff should be at or near 28 MHz. If this sounds
like an 11m trap, it is! Such that all frequencies BELOW 26 MHz
pass, and all ABOVE 28 MHz pass. To me it seems like a low pass
filter (26) and a high pass (28) in parallel, but Im unsure of
how to match the two sections so as to provide a trap band filter
with 50 ohm impedance and a .5dB insertion loss. Anybody?

(the qrm in my neighborhood is fierce!)




-Avatar-> (aka: Erik K. Sorgatz) KB6LUY          +----------------------------+
TTI([e-mail])or: [e-mail] *Government produces NOTHING!*
3100 Ocean Park Blvd. Santa Monica, CA  90405    +----------------------------+
(OPINIONS EXPRESSED DO NOT REFLECT THE VIEWS OF CITICORP OR ITS MANAGEMENT!)

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

Date: 22 Aug 1994 18:56:18 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!overload.lbl.gov!dancer.ca.sandia.gov!cronkite.nersc.gov!fastrac.llnl.gov!usenet.ee.pdx.edu!news.reed.edu![e-mail]
Subject: building questions
To: [e-mail]

      I have two questions which I thought I'd roll into one post:

1) I seem to remember someone saying on this group that FM tranceivers
were relatively easy to make with the right chip set.  Does anyone have
a very simple design, that could be assembled cheaply?

2)  I have come into an accesory VFO which has memories as well as
other bells and whistles on it, and was thinking it might be nice to
build an HF transciever around it.  So I'd like a simple design that
puts out at least a couple of watts, that would be capable of CW and
SSB.

    I've got pretty good soldering skills, and used to be both a
compter repair tech, and various types of telco tech.  I'm perfectly
comfortable with building, but my theory is weak so, I'd like a design
that is simple to align and repair.  I know somebody is thinking that I
should buy a kit.  I'm thinking about doing that too, but building my
own might be more fun.

                              End of line...
                                   [e-mail]

Waiting for my call : (

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

Date: 22 Aug 1994 16:22:53 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!olivea!koriel!news2me.EBay.Sun.COM!engnews2.Eng.Sun.COM!windjammer![e-mail]
Subject: DME (Dog Measuring  Equipment)
To: [e-mail]

PaulBreed ([e-mail]) wrote:
: The Problem:
: The dog keeps taking off.
: It would cost too much to fence our 2 ac. in the woods,
: and he usually takes off when the kids get bored throwing the ball for him
: etc..
: (So he's not on his chain when the kids are throwing the ball etc...)
: Any system that worked could also be used to detect kid snaching etc...


: The solution:
:     Devise a system that would tell me when He was leaving the yard.
:     The dog carried part would have to fit on the collar of an 85lb
: dog.
:     It would be nice if the battery lasted at least a week.

: Idea #1
: Build a simple Distance measuring system (Pulse and respond)
: Alarm when the dog was 300ft +- 50ft from the house.
: +-50 Ft is +/- 50 nsec

<stuff deleted...>

: 4)How does the commercial perimeter system work?
: What frequency does it operate on?

Paul,

Why bother jumping up and running after the dog every time he escapes?
The commercial systems use an electrical shock collar to teach the dog
not to go beyond the perimeter.  On most dogs it works great.  On really
big dogs, I've heard that it doesn't faze them at all.  Anyway, I think
they work on a field strength basis.  An antenna wire is run around the
property perimeter, and when the collar comes within about a meter, zing!
Sounds cruel, but the dog doesn't mind so much (well if he could talk,
I guess he'd say he does :->).  I'd imagine that it uses a pretty low
frequency, like 100 KHz, but I really don't know.  My impression is that
they are expensive, like a couple hundred for a system.  Any pet store
has info on the systems (try Petco, Premium Pet, etc.).

BTW, I guess we should move this to rec.pets.dogs.

Nick Barbieri            Amateur Radio: KB6QI

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

Date: 22 Aug 94 23:23:19 GMT
From: [e-mail]
Subject: Ham-Homebrew Digest V94 #245
To: [e-mail]

ref article
 Date: 18 Aug 1994 15:19:06 -0700 From:
    agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!
    z
ip.eecs.umich.edu!yeshua.marcam.com!news.kei.com!ssd.intel.com!chnews!ornews.int
    e l.com!ornews.@@ihnp4.ucsd.edu Subject: 50 watt amp for six
    meter(schems).  To: [e-mail]

> In article <phb.777238394@melpar> [e-mail] (Paul
>    H. Bock) wri t es: >[e-mail] (Fred Dugas) writes: > >>I
>    am looking for schematics for a medium power amp for six
>    meters...

>     If you wish, I'll dig back through my old ARRL Handbooks  and VHF
>Manuals and see what's there; copies are free if I find anything of
>potential interest.

>Also check old copies of Ham Radio magazine.  I have an old 826 tube
>    that came out of an ultrasonic cleaner that will put out 90 watts
>    up to 150Mhz.  Specs for it are in the old Handbooks.  The trick
>    is to find a design that's close to what you want and then modify
>    it to match what's available.

>My Dad ran a Clegg Venus which has about as clean a 40-watt signal as ever
>I've seen on 6 (I ran spectral measurements on it) and he still had
>TVI problems;...

>Wow, I'll bet that's a rare radio!  I have a Clegg 99'er and used to
>    have a Clegg 66'er but they both are runts compared to 40 watts.
>    How many different 6 meter models did Clegg make?




>[e-mail]  WA7LDV               Leave it to the BEAVER
>    state
>I speak only for myself.                            <<< OREGON >>>

 I owened the Clegg Thor-6 ( 35 watts AM ) and the Zewus ( 150 watt
    am ) 6-2 tx used with the Intercepter RX. Ed Elegg sold his ham
    gear company to one of the big corporations who promptly swalled
    their patents and shut down the ham production!

    A suggestion for the 6 meter amp would be to look for old low-band
    fm tx strips which were made by motorola, ge, rca, etc. The tubes
    would typicaly be 6146, 829, 5894 etc and outputs ranged from
    30-200 watts. That would acquire a functional socket, maybe a good
    tube and tank circuits which could be modified easily to cover the
    six meter band or the 10 meter band. If you acquire old low band
    fm base stations that would also get you a class c power supply.
    Bias supplies for SSB useage would not be as big a problem as the
    main plate and filement supplies. You can also try the same
    approach with solid state rigs but I have had no experience in
    such conversions. If you are interested in mobile use of the amp
    you might look for somehting like a motorola g strtip transceiver
    and abondon the rx and exciter portions.

    good luck..

    [e-mail]  | My employer does not  endorse my
    k5vmu @ Plano,Tx                | opinions nor thoughts!! Perhaps
    [e-mail]          | I should disclaim them!!!!!

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

Date: 22 Aug 94 23:23:24 GMT
From: [e-mail]
Subject: Ham-Homebrew Digest V94 #245
To: [e-mail]

ref article
 Date: 18 Aug 1994 15:19:06 -0700 From:
    agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!
    z
ip.eecs.umich.edu!yeshua.marcam.com!news.kei.com!ssd.intel.com!chnews!ornews.int
    e l.com!ornews.@@ihnp4.ucsd.edu Subject: 50 watt amp for six
    meter(schems).  To: [e-mail]

> In article <phb.777238394@melpar> [e-mail] (Paul
>    H. Bock) wri t es: >[e-mail] (Fred Dugas) writes: > >>I
>    am looking for schematics for a medium power amp for six
>    meters...

>     If you wish, I'll dig back through my old ARRL Handbooks  and VHF
>Manuals and see what's there; copies are free if I find anything of
>potential interest.

>Also check old copies of Ham Radio magazine.  I have an old 826 tube
>    that came out of an ultrasonic cleaner that will put out 90 watts
>    up to 150Mhz.  Specs for it are in the old Handbooks.  The trick
>    is to find a design that's close to what you want and then modify
>    it to match what's available.

>My Dad ran a Clegg Venus which has about as clean a 40-watt signal as ever
>I've seen on 6 (I ran spectral measurements on it) and he still had
>TVI problems;...

>Wow, I'll bet that's a rare radio!  I have a Clegg 99'er and used to
>    have a Clegg 66'er but they both are runts compared to 40 watts.
>    How many different 6 meter models did Clegg make?




>[e-mail]  WA7LDV               Leave it to the BEAVER
>    state
>I speak only for myself.                            <<< OREGON >>>

 I owened the Clegg Thor-6 ( 35 watts AM ) and the Zewus ( 150 watt
    am ) 6-2 tx used with the Intercepter RX. Ed Elegg sold his ham
    gear company to one of the big corporations who promptly swalled
    their patents and shut down the ham production!

    A suggestion for the 6 meter amp would be to look for old low-band
    fm tx strips which were made by motorola, ge, rca, etc. The tubes
    would typicaly be 6146, 829, 5894 etc and outputs ranged from
    30-200 watts. That would acquire a functional socket, maybe a good
    tube and tank circuits which could be modified easily to cover the
    six meter band or the 10 meter band. If you acquire old low band
    fm base stations that would also get you a class c power supply.
    Bias supplies for SSB useage would not be as big a problem as the
    main plate and filement supplies. You can also try the same
    approach with solid state rigs but I have had no experience in
    such conversions. If you are interested in mobile use of the amp
    you might look for somehting like a motorola g strtip transceiver
    and abondon the rx and exciter portions.

    good luck..

    [e-mail]  | My employer does not  endorse my
    k5vmu @ Plano,Tx                | opinions nor thoughts!! Perhaps
    [e-mail]          | I should disclaim them!!!!!

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

Date: Mon, 22 Aug 1994 16:34:07 GMT
From: psinntp!arrl.org![e-mail]
Subject: help with crystal set?
To: [e-mail]

JimCan ([e-mail]) wrote:

: The only possible problems I can think of is that the "ground" isn't
: really connected to the ground (although I have also tried a sink) or the
: individual wires of the antenna are not supposed to touch (which would be
: impossible to correct, because of the kinkiness of the antenna wire--

The antenna/ground is important for improving reception, but unless you
live far from any AM station, I wouldn't worry about it, just yet.

: though I have connected my antenna to a store-bought radio and noticed a
: definite improvement in clairity) or that the capaciter is not of the
: right capacitance. The instructions I'm following call for a 365 picofarad
: capacitor, but in the schematic, they have a variable one. What I'm
: getting for a result is not static, but no sound whatsoever-- could this
: be related to improper grounding, antenna, or capacitance?

You need a variable capacitor to properly tune the radio.  After all,
if you tune a normal radio to the wrong frequency you just get static.
The headphones you are using may not be sensitive enough to pick up static.
--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz

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

Date: Mon, 22 Aug 1994 21:39:04 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!csusac!csus.edu!netcom.com![e-mail]
Subject: Portable EME Station -- Questions
To: [e-mail]

I hope that one of these will be the correct newsgroup for this
question; advice on redirection is welcome.

I'm thinking of assembling a portable EME station that I could use
for demonstrations at schools. I don't know if such a thing is
possible at any reasonable cost, or for any reasonable definition
of "portable." But here are the questions anyway:

1. I assume that because of my Arizona location, I can't use
   432MHz. This seemed to be the best compromise between power
   amplifier practicality and antenna size. Is 23cm a good
   second choice?

2. Assuming that 23cm is a good second choice, how can I generate
   the necessary power on that band? I've found one amplifier
   design, in the 1975 (!) ARRL Handbook. It uses a pair of
   3CX100A5 tubes and could be used for 200W continuous or
   400W intermittent. Since the antenna will be compromised for
   portability's sake (no 24-ft dishes), I'd like to get more
   power than this. Has the state of the art improved since 1975?
   If so, where can I find construction information?

3. Various publications have stated that Yagi designs have proven
   unsatisfactory for EME work at 23cm, but don't say why. I can
   make guesses (losses in the splitter network, etc.), but don't
   know for sure. Is it in fact possible to use these for 23cm
   EME work? A back-of-the-envelope calculation suggests that a
   24dBi array could be quite practical, but I haven't considered
   splitter network losses.

4. If a Yagi array really can't be made practical, does anyone
   know of some portable dish designs -- 4m or so? The dish
   doesn't have to be rugged or able to stand up to weather since
   it will never see a permanent installation.

The objective is a station that can hear its own echoes -- not
necessarily with communication-capable quality -- and can
communicate with a "big gun" EME station. If my planning is going
in a completely fruitless direction for such an objective, I'd
like to know early on!

Thanks,
-- Bruce Toback
KN6MN

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

Date: 22 Aug 94 13:18:10 GMT
From: [e-mail]
Subject: Subject: Reed Relays for RF
To: [e-mail]

>Subject: Reed Relays for RF

>I am (for some time now) in the process of building a 4-1000 linear amplifier.
>It will run a good KW (4KV plate voltage). I have a good vacuum relay for
>the output RF switching. I am planning on using a RF rated reed relay to
>switch the input RF.

Get a copy of the January issue of QST.  There is an article in there
by linear expert, R. Measures, AG6K.  He describes a QSK circuit using
a Kenwood RF reed relay for the input switching and a Jennings RJ1A for
the amp. I built a QSK circuit based on his description and am very
pleased with the results.  The exciter relay is a replacement part
for Kenwood TS850S.  It cost about $30 w/shpg, from Kenwood's East
Coast parts distributor.

I used a quad-trace scope to measure the timing of input and output
relays and was amazed how fast and clean the timing mechanism was.
I used Measure's values for all time critical functions.
......................................................................
73 de Walt Kornienko  -   K2WK        Internet:  [e-mail]
DX PacketCluster:  K2WK > W3MM  (FRC)     Packet: [e-mail]
______________________________________________________________________

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

Date: 22 Aug 1994 12:57:37 GMT
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!csulb.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!yeshua.marcam.com!news.kei.com!babbage.ece.uc.edu!meaddata![e-mail]
Subject: WANTED: Source for Signetics NE604 or SA604 IF/FM detector chip
To: [e-mail]

In article <[e-mail]>, [e-mail] (Leon Heller) writes:
|> In article <32u8co$[e-mail]>
|>            [e-mail] "Richard F. Lukes" writes:
|>
|> > I am trying to find a source for the Signetics NE604 or the equivalent

--

Try DC Electronics in Scottsdale, Arizona.  Mailing address is
PO Box 3203, Scottsdale, AZ   85271.  Phone number: 800-467-7736

They do have a $15 minimum order, but I think that is waived on pre-paid
orders.  I don't have their catalog in front of me so I don't know for
sure if they have that chip.  I do remember seeing some Signetics chips.


Mike Suhar  WB8GXB
[e-mail]

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

Date: 22 Aug 1994 19:05:16 GMT
From: lll-winken.llnl.gov!s07.es.llnl.gov![e-mail]
To: [e-mail]

References <[e-mail]>, <[e-mail]>, <[e-mail]>
Subject : Re: XYL Reactions (snicker- Kodak moment) (was Re: IC-751A HF Transceiver)

I would be very hesitant to put any electronic equipment in a dishwasher. Don't forget that
it is assembled with lead solder. I imagine that you will end up with measurable amounts of
lead on your next load of dishes.

Steven Hunter KC6RKV

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

End of Ham-Homebrew Digest V94 #248
******************************