| View previous topic :: View next topic |
| Author |
Message |
server
Guest
|
 Posted: Sat Jun 28, 2008 11:38 pm Post subject: NTSC TV tuner for surplus PC CRT monitor |
 |
|
| message unavailable |
|
| |
|
 Back to top |
GMAN
Guest
|
| Posted: Sat Jun 28, 2008 11:38 pm Post subject: Re: NTSC TV tuner for surplus PC CRT monitor |
|
|
In article <6d2d27a7-d3ec-4ee2-aab3-efd3f6f0b373@d1g2000hsg.googlegroups.com>, Engineer <junk2007@rogers.com> wrote:
[quote]Hi, everyone.
Is there an affordable TV tuner out there that receives off-air
(antenna) or cable TV and produces a good TV picture on a regular PC
monitor with only the video display connector (no PC required, of
course.) Picture need not be HD - just ordinary NTSC would be fine.
Reason: I would like to utilize a spare 17 inch IBM hi-resolutuion PC
monitor (with, IIRC, up to 70 Hz vertical scan, 1280 x 1024 pixels
and 0.24 mm dot size) as decent a basement TV since it>s resale value
for the office is close to zero.
Feel free to email me at "analogdino attaboy rogers dotty as they come
com" (suitably decoded - the visible address is an anti-span fake.)
Thanks for all replies.
Cheers,
Roger
I have bought a few off of ebay. I dont own this model but heres an ebay search[/quote]
for you.
http://cgi.ebay.
com/External-TV-Box-Tuner-WXGA-SXGA-for-LCD-TFT-Monitor-VGA_W0QQitemZ2302654875
76QQihZ013QQcategoryZ3761QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://search.ebay.com/search/search.
dll?from=R40&_trksid=m37&satitle=EXTERNAL+TV+TUNER |
|
| |
|
| Back to top |
Bill
Guest
|
| Posted: Sun Jun 29, 2008 1:00 am Post subject: Re: General Oscilloscope Question |
|
|
JMini wrote:
[quote]On 6/22/2008 2:52:30 PM, instantwow wrote:
I recently purchased an oscilloscope on Ebay. It is a 100Mhz model. I
was configuring the scope using the calibration output, which is a
1Khz 2 volt square wave. The horizontal line drawing on the scope
looks good, however, the vertical trace portion on this wave is barely
visible at the highest brightness setting. Is the normal, or is there
a problem with the scope? Is this common with analog scopes? This is
my first oscilloscope, so I’m not sure. Here’s a photo I took. Any
ideas?
http://www.flickr.com/photos/27262651@N04/2601539284/
Thanks.
It>s just making the transition from 0V to 2V almost instantaneously (high
slew rate). Leaving little time for the phosphor on the screen to respond. It
looks like it>s responding well.
[/quote]
That part has always bothered me. I have a 1990 vintage 4 channel,
100MHz, 2245 with only about 40 hours of use after 18 years, and it has
the same square wave. Having a 1KHz and a 1MHz calibration would have
been appreciated so the rise time could be checked for overshoot and
proper probe calibration for higher frequencies.
That part aside, it works like a dream since 99% of my needs are below
100MHz. It was bought for me by a company I was consulting for so I
could do more work at home and not have to be physically in their
building, but I had to pay 'income' tax on it.
I would still like to get an older 547 since that had the sharpest
display of any scope, ever.
Bill Baka |
|
| |
|
| Back to top |
JANA
Guest
|
| Posted: Sun Jun 29, 2008 10:03 am Post subject: Re: Fluke 6070A 6071A |
|
|
I would contact Fluke directly and ask about this. They should have the most
accurate answers for you.
--
JANA
_____
<Syncom2@gmail.com> wrote in message
news:5bd8e0a4-7ce1-490f-9813-3d4128e8edc9@z66g2000hsc.googlegroups.com...
I recently purchased a Fluke 6070A RF Signal Generator on eBay.
While I was playing with it I noticed that the Spin Knob has 18
magnetic detents per full revolution resulting in 18 counts per
compleat revolution instead of the 25 counts per revolution that both
the user manual and datasheet say it should have.
Also the Instruments default setting when turned from the cold is:-
Freq. = 300 MHz and Amplitude = -10 dBm. (This instrument does not
have the Non-Volatile Memory option fitted i.e. -570 ) where as the
standard power-on setup listed on page 5E-2 of the Operator Manual
states that the Frequency ddisplayed should be 250 MHz and Amplitude
-60dBm. I also have my suspicion with regard to the FM deviation
limits but that>s a bit more complicated to check as there is an
interaction with the Modulating frequency and Output frequency.
The guy I bought it from says he has a number of these all the same.
So what have I actually got ? I can find no reference to it on the
internet
Were there a couple of different versions or did they do custum
versions for some customers e.g. MOD or GOV etc. ?
Apart from this the instrument works as expected. |
|
| |
|
| Back to top |
Engineer
Guest
|
| Posted: Sun Jun 29, 2008 8:05 pm Post subject: Re: Attention Heath TT-1 Tube Tester owners |
|
|
On Jun 15, 9:56 pm, JosephKK <quiettechb...@yahoo.com> wrote:
[quote]On Sat, 14 Jun 2008 12:53:35 -0500, Jim Adney <jad...@vwtype3.org
wrote:
[/quote]
(snip)
Interesting thread... I use a Heathkitt TC-2 quite a lot - the chart
is in good shape (still !), but I>m not convinced that rolling it up
and down is the best way to get to specific tube set-up data (of
course, it>s always to hand... er, thumb !) For odd-balls, you have
to go to the supplementary sheets anyway. It>s cheaper to copy it
sequentially onto separate 8 1/2 x 11 sheets (two sided, one or two
columns, use a paper mask on the "other" column as you don>t want it
on the same page), spiral bind them and keep them with the tester.
I>ve done this for the Heathkit tube supplementary sheets (and for
most downloaded manuals.) Then simply scan down to the tube you want
by eye. Easy to add extras, too.
I don>t say scrap the roller chart - put it back carefully for
posterity (repaired as needed) and keep it there, but not used much.
Cheers,
Roger |
|
| |
|
| Back to top |
Engineer
Guest
|
| Posted: Sun Jun 29, 2008 8:12 pm Post subject: Re: 6EJ7 |
|
|
On May 15, 10:53 pm, "Donald Ennis" <lis...@ameritech.net> wrote:
[quote]I>m trying to find characteristic curves and peramaters for this vacuum tube
so I can check the output and possibly the transconductance on about 150 of
these I have in the basement. Can anyone help me out?
Thanks d.
[/quote]
Go to
http://www.nj7p.org/Tube4.php?tube=6ej7
but, sorry, no curves.
Cheers,
Roger |
|
| |
|
| Back to top |
Engineer
Guest
|
| Posted: Sun Jun 29, 2008 8:15 pm Post subject: Re: How Does CD Player Anti Skip Work? |
|
|
On May 16, 7:33 pm, John Tserkezis
<j...@techniciansyndrome.org.invalid> wrote:
[quote]David Tweed wrote:
Yes, that wording is a bit confusing. What>s really happening is that
the audio to the DAC is *always* coming from the RAM, which is being
used as a FIFO buffer.
May be worth adding, that although a buffer however small, is always being
used, that for the CD players that have the "anti-shock" feature, have a
LARGER buffer than those without.
In addition, they *might* spend a little more on the physical shock
resistance of the tray and such, but not a lot. Since adding ram is by far
easier, smaller and cheaper than the engineering that has to go into a tray to
stop jogging skips, the extra ram wins every time.
So to the OP, it>s not really a "feature" in the true sense, it>s just more
of what the circuitry already has.
--
Linux Registered User # 302622
http://counter.li.org
[/quote]
I hope someone now edits the Wikipedia entry!
Cheers,
Roger |
|
| |
|
| Back to top |
Bill
Guest
|
| Posted: Mon Jun 30, 2008 2:48 am Post subject: Re: 6EJ7 |
|
|
Engineer wrote:
[quote]On May 15, 10:53 pm, "Donald Ennis" <lis...@ameritech.net> wrote:
I>m trying to find characteristic curves and peramaters for this vacuum tube
so I can check the output and possibly the transconductance on about 150 of
these I have in the basement. Can anyone help me out?
Thanks d.
Go to
http://www.nj7p.org/Tube4.php?tube=6ej7
but, sorry, no curves.
Cheers,
Roger
[/quote]
If you don>t find the curves, I can scan some of my tube books since I
never really quit using tubes (4 tube short wave radios.).
Bill Baka
My email is open for requests off of the group. |
|
| |
|
| Back to top |
Ancient_Hacker
Guest
|
| Posted: Mon Jun 30, 2008 12:05 pm Post subject: Re: Fluke 6070A 6071A |
|
|
I would just thank my lucky stars that the thing works at all.
I got a pallet-load of these a few years back. About 85% of them had
some serious problem.
The Fan controller IC tends to burn up real good. The hundreds of
IC>s tend to work out of their sockets.
And many issues are not fixable-- there are a passel of adjustments
that are "factory-only",
or require a reburn of the calibration roms. |
|
| |
|
| Back to top |
Pierre-François (f5bqp_pf
Guest
|
| Posted: Sun Jul 06, 2008 12:59 pm Post subject: Re: help Tektronix 492 |
|
|
Hi,
Did you found your manuals?
pf
"mimmobn" <domenicopennino@gmail.com> a écrit dans le message de news:
feee551a-4f7a-459a-baf3-25c97bdfc66f@k30g2000hse.googlegroups.com...
[quote]help
I have a spectrum analyzer Tektronix 492 and not have the manual for
repair
my problem is:
turns on and seem to work well, but no analyzes the input signal is
displayed only noise.
please help me by searching the handbook of service for repair?
thank you[/quote] |
|
| |
|
| Back to top |
Kalle Pesonen
Guest
|
| Posted: Tue Jul 15, 2008 4:27 am Post subject: Nokia Communicator |
|
|
Kun vuosia sitten aloin systemaattisesti lanseeraamaan ydinalan synkkää
tulevaisuusfaktaa, päätin lähteä niin radigaalilla linjallani, ettei
"alkuunpanijaa jutuissani" tarvitse jälkeenpäin jossitella. Otetaan
esimerkki. Kun vuosia sitten aloin esittämään, maailman ensimmäisenä, että
jatkossa mehiläiset tulevat ydinaavikoitumisen takia miltei kuolemaan
sukupuuttoon sain osakseni miltei 98% silkkaa naurua ja epäuskoa. Se oli
aikalaisistamme jotain käsittämättömän hauskaa .. niin ..silloin! Ei haluttu
ymmärtää, että se olisi edes teoriassa mahdollista. Miten miljardit
maapallon mehiläiset nyt noin vaan yhtäkkiä katoaisivat ja naurua pilkan
keraa kyllä piisasi. Mutta alan ammattilaista ei se edes hetkauttanut.
...Kirjoittelin vaan, että näette varsin megalomaanisen muuttumisen. Ei vaan
ollut kuulema KUKAAN mehiläispuutoksista kuullut, saati että tautiahan ne
toki ovat, ja varroapunkkeja kaikki sairastuneet mehiläiset kantoi. Ei
uponnut ÄLY tykillä, ei taulalla ydininsuille, ei!
03.06.2008 MTV ja kymmenen uutiset. Kylmänä totuutena on viimein vuosien
jossittelujen jälkeen PAKKO vaikein vatsoin myöntää, että -90% mehiläiskato
kattaa maapalloamme jo. Einsteinin mehiläisennuste oli tullut karusti
kylään, merkkinä pölyttäjistä ei muuta kuin jätökset jäljellä ja
ENNENKAIKKEA vuiosien varmuus virus- ja punkkisyistä oli toimittajien suista
kuin taiottuna kaikonneet! Mitä IHMETTÄ? Eikä vanhat vuosien mehiläisvalheet
kestäneet ennustusteni jälkeen enää äkkiä lainkaan?
Täysin nsama tilanne oli aikanaan ydinaavikoitumisfaktoissani myös. Kummasti
vaan on alkanut lehdet ja jopa FAO, YK ja TV muotoilemaan tulevaisuuttamme
ydinaavikoituvaksi ennusteitteni mukaan, toki väkipakoin. Parisen vuotta
sitten ennakointeja ruuan totaalikadolle ja kastelun elintärkeälle +50%
lisäämisille CO2 lisän ennakoimissa +30% tulvaennakoinneissa ei uskonut
aiemmin juuri kukaan. Nyt on ydinaavikoituminen kiristänyt otetta 12v vallan
HURJASTI! Ruuan totaalikato koettelee jo parrun lailla kansanmassojen
otsaluuta. Ikäänkuin kohtalon oikusta KAIKKI keskeisemmät
Neo-teismiennusteeni mystisesti vaan ajaa omavoimaisesti itseään
julkisuuteen. Pahus kun alkoi jopa TVO:n tritium kohota ennakoimani mukaan
ihan hillittömästi! Metsät menetämme raunioikseen takuusti muutamissa
vuosissa säteilyn syödessä kasvuionisaatiopankit nolliin. On se vaan kummaa
miten KUKAAN ei kyseenalaista enää edes linnut ilmasta tappavan
beettasoihdun olemasaolon mekaniikkoja. Vaan päinvastoin asia leviää jo
maailman tekstareissa ennennäkemättömästi. Jopa minusta riippumatta.
Vaan ei tämä toki ole kuin vasta VARSIN varovaista alkulämmittelyä. Olen
kiteyttänyt jatkot niin, että kerraten, aina vaan tiukemmalla
kuristusotteella. Ydinaavikoitumiskumpuamistuhojen tappamat meremme tulevat
olemaan jatkon airuita. Eli ihmiskunnalta otetaan luontolohko kerrallaan,
kuten vaikka matelijoiden ja sammakoiden maaailmanlaajuinen hätätila
tritiumsadelammikkokuolemiinsa. Palikka kerrallaan, olkaa huoleti, kyllä
jartkossa LÖYTYTY! Itse asiassa edes minä en halua kertoa mitä tulevat
vuodet esittää. Olen vaan pyrkinyt kiteyttämään selkeitä merkkejä
ydinaavikoitumiskasvusta julki. Kuten huommaatte liki 99% osumatarkkuuksin.
Olemme yksinkertaisesti menossa "punaisten sateitten aikaan" jonka
seurauksena yksi on varmaa. Ydinvoima LÄHTEE! En , toistan EN usko
maailmanloppuun asiassa, vaan jossemme tajua ydinvoiman tuhoajuutta menemme
kyllä ydinvoimamme mukana TAATUSTI hautaan. Mutta ehkä aletaan tajuta
ydintappomekaniikoja ja kaikkein pahin ydinairut vältetään? Ehkä ydinala ei
kansanmurhaajana salli viimehetken järkiintymistä ja ihmiskunta menee
ydinvoimineen maailmasta?
PS. Kyse ei ole minkäänmoisista meedioinnneista. Vaan IHAN
peruskvanttiydinfaktojen tajuamisesta vähän samoin kuin jo Einstein asiat
ydinvastaisuuksissaan oivalsi! Haluan korostaa tätä jo sen vuoksi, etten
halua "ennustajan leimamystifiointia" kosken sellaiseen toki kykene. Vaan
nämä mykistävät ennakointini perustuvat siis arkiseen IAEA:n sensuroimaan
kuivaan kvanttiydinfysiikan tajuntaylivoimaan. Ei mihinkään muuhun. Aiemmin
sain toki tottua silmittömään naureskeluun ja epäuskon hyökyyn.. .. Mutta
kas vaan, "ikäänkuin" ydininsujen naurujänteistä olisi jo ikävin ponsi
katkennut´?))Noo, kuten sanoin jatkossa MEGAKLOMANISESTI löytyy!(( |
|
| |
|
| Back to top |
BillW50
Guest
|
| Posted: Thu Oct 02, 2008 8:22 pm Post subject: Re: Laptop power adaptor using battery bay and connector? |
|
|
In news:op.uh5lc30z4buhsv@fx62.mshome.net,
Peter Hucker typed on Sat, 27 Sep 2008 19:52:05 +0100:
[quote]On Sat, 27 Sep 2008 19:47:55 +0100, John Williamson
johnwilliamson@btinternet.com> wrote:
Peter Hucker wrote:
On Fri, 26 Sep 2008 21:54:02 +0100, Adrian C <email@here.invalid
wrote:
Peter Hucker wrote:
Amend your sig please the RFC says FOUR lines only.
The RFC was written in 1802.
With an attitude like that you have probably now killed your
chance of getting a sensible answer from usenet.
In my experience there are very few that care about things like sig
size and line length any more.
Obviously some here do, or you>d have got a polite answer by now.
I>ve got loads of polite answers, not necessarily all in here, I
posted the query to loads of groups.
The last time I saw anything likw what you describe was the optional
mains adaptor for a Panasonic camcorder in about 1990.
That rings a bell. It>s possible that>s what I>m thinking of.
Of course, you *could* always design & build one yourself using off
the shelf components from Maplins. It>s not rocket science.
It>s the battery connector that would suck. Maybe I should dismantle
a dead battery?
BTW, I>d have to emulate a battery - the laptop will expect to be
able to communicate with it to know how full it is, and no I>m too
un-knowledgable and lazy to build something that complex.
[/quote]
I believe most laptops figure out how much of a charge the battery is in by
its output voltage. So I don>t think that would be a problem. The tricky
part would be if you ever used both DC inputs at the same time. Then the
stock one just might want to charge the battery emulator. But I believe this
wouldn>t be a problem for most people.
--
Bill
Asus EEE PC 8GB
Windows XP SP2 and Xandros Linux |
|
| |
|
| Back to top |
Peter Hucker
Guest
|
| Posted: Thu Oct 02, 2008 11:20 pm Post subject: Re: Laptop power adaptor using battery bay and connector? |
|
|
On Thu, 02 Oct 2008 16:22:00 +0100, BillW50 <BillW50@aol.kom> wrote:
[quote]In news:op.uh5lc30z4buhsv@fx62.mshome.net,
Peter Hucker typed on Sat, 27 Sep 2008 19:52:05 +0100:
On Sat, 27 Sep 2008 19:47:55 +0100, John Williamson
johnwilliamson@btinternet.com> wrote:
Peter Hucker wrote:
On Fri, 26 Sep 2008 21:54:02 +0100, Adrian C <email@here.invalid
wrote:
Peter Hucker wrote:
Amend your sig please the RFC says FOUR lines only.
The RFC was written in 1802.
With an attitude like that you have probably now killed your
chance of getting a sensible answer from usenet.
In my experience there are very few that care about things like sig
size and line length any more.
Obviously some here do, or you>d have got a polite answer by now.
I>ve got loads of polite answers, not necessarily all in here, I
posted the query to loads of groups.
The last time I saw anything likw what you describe was the optional
mains adaptor for a Panasonic camcorder in about 1990.
That rings a bell. It>s possible that>s what I>m thinking of.
Of course, you *could* always design & build one yourself using off
the shelf components from Maplins. It>s not rocket science.
It>s the battery connector that would suck. Maybe I should dismantle
a dead battery?
BTW, I>d have to emulate a battery - the laptop will expect to be
able to communicate with it to know how full it is, and no I>m too
un-knowledgable and lazy to build something that complex.
I believe most laptops figure out how much of a charge the battery is in by
its output voltage. So I don>t think that would be a problem. The tricky
part would be if you ever used both DC inputs at the same time. Then the
stock one just might want to charge the battery emulator. But I believe this
wouldn>t be a problem for most people.
[/quote]
I was assuming the other connectors on the battery were there for a reason. Are you sure about the laptop not needing them?
--
http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com
You are the only person I know that has ever had a brain tumour removed from their arse. |
|
| |
|
| Back to top |
BillW50
Guest
|
| Posted: Fri Oct 03, 2008 12:08 am Post subject: Re: Laptop power adaptor using battery bay and connector? |
|
|
In news:op.uies8zg44buhsv@fx62.mshome.net,
Peter Hucker typed on Thu, 02 Oct 2008 19:20:49 +0100:
[quote]On Thu, 02 Oct 2008 16:22:00 +0100, BillW50 <BillW50@aol.kom> wrote:
In news:op.uh5lc30z4buhsv@fx62.mshome.net,
Peter Hucker typed on Sat, 27 Sep 2008 19:52:05 +0100:
On Sat, 27 Sep 2008 19:47:55 +0100, John Williamson
johnwilliamson@btinternet.com> wrote:
Peter Hucker wrote:
On Fri, 26 Sep 2008 21:54:02 +0100, Adrian C <email@here.invalid
wrote:
Peter Hucker wrote:
Amend your sig please the RFC says FOUR lines only.
The RFC was written in 1802.
With an attitude like that you have probably now killed your
chance of getting a sensible answer from usenet.
In my experience there are very few that care about things like
sig size and line length any more.
Obviously some here do, or you>d have got a polite answer by now.
I>ve got loads of polite answers, not necessarily all in here, I
posted the query to loads of groups.
The last time I saw anything likw what you describe was the
optional mains adaptor for a Panasonic camcorder in about 1990.
That rings a bell. It>s possible that>s what I>m thinking of.
Of course, you *could* always design & build one yourself using off
the shelf components from Maplins. It>s not rocket science.
It>s the battery connector that would suck. Maybe I should
dismantle a dead battery?
BTW, I>d have to emulate a battery - the laptop will expect to be
able to communicate with it to know how full it is, and no I>m too
un-knowledgable and lazy to build something that complex.
I believe most laptops figure out how much of a charge the battery
is in by its output voltage. So I don>t think that would be a
problem. The tricky part would be if you ever used both DC inputs at
the same time. Then the stock one just might want to charge the
battery emulator. But I believe this wouldn>t be a problem for most
people.
I was assuming the other connectors on the battery were there for a
reason. Are you sure about the laptop not needing them?
[/quote]
It is hard to say depending on the design. But I have done it before and it
worked fine. The other connectors are usually there for safety and the
charging circuit which you don>t need anyway.
Although keep in mind, the AC adapters are a few volts higher than what the
battery voltage is. And I wouldn>t feed too much higher than the battery. So
I wouldn>t feed the original supply into it. But whatever supply you use, it
should be well regulated.
--
Bill
Asus EEE PC 8GB
Windows XP SP2 and Xandros Linux |
|
| |
|
| Back to top |
John Williamson
Guest
|
| Posted: Fri Oct 03, 2008 12:11 am Post subject: Re: Laptop power adaptor using battery bay and connector? |
|
|
Peter Hucker wrote:
<Snipping>
[quote]BTW, I>d have to emulate a battery - the laptop will expect to be
able to communicate with it to know how full it is, and no I>m too
un-knowledgable and lazy to build something that complex.
I believe most laptops figure out how much of a charge the battery is in by
its output voltage. So I don>t think that would be a problem. The tricky
part would be if you ever used both DC inputs at the same time. Then the
stock one just might want to charge the battery emulator. But I believe this
wouldn>t be a problem for most people.
I was assuming the other connectors on the battery were there for a reason. Are you sure about the laptop not needing them?
They>re there to let the laptop charging circuitry monitor the battery[/quote]
temperature while charging, usually. Sometimes, there>s a way for the
laptop to monitor individual cells, but that>s rare.
--
Tciao for Now!
John. |
|
| |
|
| Back to top |
|
