Digest for sci.electronics.repair@googlegroups.com - 16 updates in 5 topics

"pfjw@aol.com" <peterwieck33@gmail.com>: Jun 19 11:00AM -0700

I have come into a small, but totally unexpected windfall. As is the way of these things, it will be split into thirds, one to savings, one to my wife for spending on the house - as is her habit, and one to play with.
 
I am looking for a *SIMPLE* AM/FM/SW signal generator - need not be stereo, but I would like it to be digital. And, cheap.
 
I have two vintage devices that work just fine, but as I am gently approaching my "retirement" bench (still about 5 years out, but close enough) I am trying to reduce the clutter to fewer, but easier to use instruments.
 
I see devices in the many thousands of dollars - no need for that. Nor will I fuss about Chinese-Origin equipment in this case, as long as it is reliable and simple. The number of radios I actually align in a year, or FM tuners may be counted on both hands, or fewer. And of those, few of them are so far off as to require much effort - well, maybe that last Hallicrafters.
 
If this is too much to expect, what about a _REALLY_ good analog device, small, simple and solid-state? I am patient, and can wait as well. No rush whatsoever.
 
My budget is at/around US$320.
 
Along these lines - what about something like this?
 
https://www.ebay.com/itm/Leader-LSG-221B-Signal-Generator/232804889856?hash=item363440b500:g:qK4AAOSwVuNbGAML
 
Thanks in advance!
 
 
Peter Wieck
Melrose Park, PA
Phil Allison <pallison49@gmail.com>: Jun 19 08:15PM -0700


> My budget is at/around US$320.
 
> Along these lines - what about something like this?
 
> https://www.ebay.com/itm/Leader-LSG-221B-Signal-Generator/232804889856?hash=item363440b500:g:qK4AAOSwVuNbGAML
 
 
** That unit has a frequency range of 25MHz to 499MHz.
 
Specs are hard to find so I am not sure if it does wide FM ( +/- 75 kHz ).
 
Being "synthesised" makes it very stable, but so are all the broadcast stations.

 
 
..... Phil
ggherold@gmail.com: Jun 20 07:58AM -0700


> Thanks in advance!
 
> Peter Wieck
> Melrose Park, PA
 
I like my Rigol DG1022. But only goes to 25 MHz.

https://www.rigolna.com/products/waveform-generators/dg1000/
 
100 MHz get's more expensive.
 
George H.
"pfjw@aol.com" <peterwieck33@gmail.com>: Jun 20 08:12AM -0700

What I am looking for is something that goes from Longwave through FM (US commercial band).
 
I would like it to be digital so that I could check it (once) with a proper counter, and the rely upon it until the next check. I am not calibrating NASA probes, but vintage AM/SW radios and (mostly) vintage FM tuners. I do have a FM-Stereo transmitter that will give me right/left only and Mono as well as fully frequency-agile, and vary from a few MW to about 50 MW, but if I have something that is really off, an independent SG would be helpful without requiring a lot of fuss.
 
Thanks again!
 
Peter Wieck
Melrose Park, PA
Fox's Mercantile <jdangus@att.net>: Jun 20 11:14AM -0500

> What I am looking for is something that goes from Longwave
> through FM (US commercial band).
 
For 90% of what I do, I use an HP3325B
DC to 20 MHz (40Mhz on the rear panel)
Specifically because it's a direct entry via keyboard.
It does swept output as well.
Obviously, it will hand 10.7 MHz FM IFs.
You can modulate it with an external generator.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Jeff Liebermann <jeffl@cruzio.com>: Jun 20 09:16AM -0700

On Tue, 19 Jun 2018 11:00:26 -0700 (PDT), "pfjw@aol.com"
 
>My budget is at/around US$320.
 
Perhaps an HP 8640B generator. I have several and used to fix them.
Looks like the selling price is about $300 (including shipping) on
eBay:
<https://www.ebay.com/sch/i.html?_from=R40&_nkw=hp+8640b&_sacat=181992&Brand=HP&LH_Sold=1&LH_Complete=1&_sop=15>
Hmmm... Might go slightly over your limit, but methinks is with it.
 
Also, I've been able to find rather old service monitors, which I
consider more useful. Wavetek or SSI 3000A. I think I paid about
$300.
 
Gotta run...
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
"pfjw@aol.com" <peterwieck33@gmail.com>: Jun 20 09:36AM -0700

On Wednesday, June 20, 2018 at 12:14:41 PM UTC-4, Fox's Mercantile wrote:
 
Obviously, it will hand 10.7 MHz FM IFs.
You can modulate it with an external generator.
 
Um.... Um....
 
Meaning I will replace one (1) analog incumbent with two items. I am half-German, so I should find this appealing at some level, but it defeats the entire purpose of the exercise.
 
Peter Wieck
Melrose Park, PA
Dale Hardin <joe.dale.hardin@gmail.com>: Jun 19 05:36PM -0700

Arfa, some years ago you offered a service manual for the Bose Wave Radio AWR1. I am in the process of restoring one and would greatly appreciate a service manual. Next in line is the CD version. Troubleshooting is much more fun with a service manual, so I appreciate any help you can provide, Regards, Dale
jurb6006@gmail.com: Jun 20 08:20AM -0700

I got it but damn. The reason I got it is because I never delete anything so there is alot to go through. I mean, I never deleted anything, I got drive letter up to O:.
 
I'll see if I can find it.
 
I can tell you from memory that it was pretty straightforward in design except for the equalization network. I mean OP AMP on top of OP AMP on top of OP AMP.
 
Now, I don't know if it's even the right one. In the original version IIRC there was one woofer/full range and the other side was just a mid/hi driver. A cavity running from one side to the other provided like a bass port. Later models had 2 woofers/fullrange and the vent was I think it the top.
 
How much this matters depends on what type of problems you have.
 
As I am sure you know if you are working on one, if they didn't sound so damn good for their size it would be chuckum and fukum.
jurb6006@gmail.com: Jun 20 08:26AM -0700

Hell, I don't h ave to do all that. It looks like hifiengine has them.
 
If you aren't registered there go ahead. they don't spam you or bug you at all and I doubt they even have a TOS, they didn't when I signed up as far as I remember. I am not even sure you have to give them your email. But either way, don't worry about it. And when you get there, do not go to database, go to library and pick the brand and then after that the model. It is much easier because the database like, any misspelling or anything and you don't find it.
Phil Allison <pallison49@gmail.com>: Jun 19 09:44PM -0700


> Better to feed in the values used in circuit plus a suitable margin.
> Many times I used beefier trannies than required because they were
> cheaper. TIPs in particular.
 
** I have often used TIP3055ts and TIP2955ts to replace a host of Asian TO220 types ( 2SA... 2SB...etc) found in low powered stereo amps and receivers.
 
The basic specs ( 70V, 15A, 90W) are well ahead of what was originally fitted and I not come across compatibility issues.
 
I also like the TIP35C and 36C very much as subs for larger flat paks.
 
 
.... Phil
jsjshubert@gmail.com: Jun 19 02:49PM -0700

I have the Emerson VCT120 the only thing missing is the flip front cover that conceals the little controls. All else is there but I just tried to insert a VHS tape and it wouldn't accept it. Are you interested in the unit?
dansabrservices@yahoo.com: Jun 19 03:23PM -0700

> I have the Emerson VCT120 the only thing missing is the flip front cover that conceals the little controls. All else is there but I just tried to insert a VHS tape and it wouldn't accept it. Are you interested in the unit?
 
You do realize that the post you are answering is 20 years old right?
Fox's Mercantile <jdangus@att.net>: Jun 19 05:32PM -0500

> On Tuesday, June 19, 2018 at 5:49:53 PM UTC-4, jsjsh...@gmail.com wrote:
>> I have the Emerson VCT120 the only thing missing is the flip front cover that conceals the little controls. All else is there but I just tried to insert a VHS tape and it wouldn't accept it. Are you interested in the unit?
 
> You do realize that the post you are answering is 20 years old right?
 
Buy is that guy going to be happy.
He's been waiting all this time. ;-)
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
John-Del <ohger1s@gmail.com>: Jun 19 04:16PM -0700

On Tuesday, June 19, 2018 at 6:32:53 PM UTC-4, Fox's Mercantile wrote:
 
> > You do realize that the post you are answering is 20 years old right?
 
> Buy is that guy going to be happy.
> He's been waiting all this time. ;-)
 
I sure am!!!!!!!
quadracycle4000@gmail.com: Jun 19 02:49PM -0700

[mom] is momentary. it returns to [off] once you let go.
on-off can be make-before-break, which is sometimes super useful, sometimes super sketchy.
on-none-on clarifies that the switch is definitely break-before-make.
It only has two positions.
on-off-on is as previously mentioned.
not sure myself about the use of brackets;
eg off-(on) versus off-on
Methinks it could be [mom] notation
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