Monday, 12 October 2015

Re: [Amateur-repairs] Test and diagnose a couple of Heathkit signal generators?

 

Put a .001 Cap in series with the output, and attach a wire to it like an antenna.  Your Radio should be able to receive the generated signal without any problem.

that same setup can be used to inject a signal in the beginning stages of the IF to align your IF stage, as well as all the other stages of your radio.'
                          Dwayne

From: "tim@wnc.bcca.org [Amateur-repairs]" <Amateur-repairs@yahoogroups.com>
To: Amateur-repairs@yahoogroups.com
Sent: Monday, October 12, 2015 1:14 PM
Subject: [Amateur-repairs] Test and diagnose a couple of Heathkit signal generators?

 
Hi everyone -


I obtained a couple of Heathkit signal generators, which appear not to work, even after some DeOxit.
One is an IG-102, the other is an SG-8


Right now, I'm just looking for some basic guidance on workable methods to test.
I know I should be able to receive them using a local receiver, but I wasn't sure exactly how to couple them to a receiver, etc


73, Tim KA4LFP

[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed]

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Posted by: Dwayne <masterdr@yahoo.com>
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[Amateur-repairs] Test and diagnose a couple of Heathkit signal generators?

 


Hi everyone -


I obtained a couple of Heathkit signal generators, which appear not to work, even after some DeOxit.
One is an IG-102, the other is an SG-8


Right now, I'm just looking for some basic guidance on workable methods to test.
I know I should be able to receive them using a local receiver, but I wasn't sure exactly how to couple them to a receiver, etc


73, Tim KA4LFP

[Non-text portions of this message have been removed]

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Posted by: tim@wnc.bcca.org
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TO UNSUBSCRIBE: login to groups.yahoo.com, select group amateur-repairs, click on "leave group" on right side of screen and follow instructions.  PLEASE do not send UNSUBSCRIBE messages to the list.

.

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Posted by at No comments:

Monday, 14 September 2015

[atlas_craftsman] test

 

test

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

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Posted by: WA5CAB@cs.com
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Please submit things you think will be useful to Jon Elson at mailto://elson@pico-systems.com

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Posted by at No comments:

Sunday, 13 September 2015

Re: [atlas_craftsman] New email thread or subject test reply plain text.

 

This is changed to plain text

Jerry

----- Original Message -----
From: wa5cab@cs.com [atlas_craftsman]
To: atlas_craftsman@yahoogroups.com
Sent: Tuesday, September 08, 2015 11:59 PM
Subject: Re: [atlas_craftsman] New email thread or subject.

And don't ever try to reply to a thread from the Yahoo web site. As a
bulletin board, it is totally worthless. Almost no one will know what you
are talking about. As a reflector, it is quite good.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

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Posted by: <jerdal@sbcglobal.net>
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Please submit things you think will be useful to Jon Elson at mailto://elson@pico-systems.com

.

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Posted by at No comments:

Re: [atlas_craftsman] New email thread or subject Test reply #1

 

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Posted by: <jerdal@sbcglobal.net>
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TO UNSUBSCRIBE FROM THE LIST:
You do this yourself by sending a message to:
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To see or edit your personal settings, view the photos, files or links http://groups.yahoo.com/group/atlas_craftsman/

Please submit things you think will be useful to Jon Elson at mailto://elson@pico-systems.com

.

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Tuesday, 1 September 2015

[Amateur-repairs] FS: HP Test gear

 

FOR SALE:

1) Hewlett Packard Model: 425A VTVM
Specs: Vacuum Tube DC Micro Volt Ammeter
DC Voltage Ranges: Eleven zero-center ranges in a 1-3-10 sequence with following full scale
positive and negative values:
±10, 30, 100, 300 microvolts;
±1, 3, 10, 30 millivolts;
±0.1, 0.3, 1 volt.
Input impedance on Voltage Ranges: 1 meg ohm ±2%; determined by input resistor which
can be removed to provide input Z in excess of 50 megohms.
DC Current Ranges: Eighteen zero-center ranges in a 1-3-10 sequence with following full
scale positive and negative values.

Has no accessories, untested - sold as-is, but appears to be in good condition.
Requires 115V AC
Available for $35.00 plus shipping.

2) Hewlett Packard 415B SWR Meter. Untested - looks good. I have no specs, but looks like
a cool gadget. Available for $30.00 plus shipping.

73 de AF4K, Bry

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Posted by: "Bry Carling AF4K" <bcarling@cfl.rr.com>
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Monday, 10 August 2015

[Electronics_101] Lipos Voltage dropping- final test

 

Paul,
 
FWIW, I'm using an older 1200mAh Lipo pack of course @ 11.1 V (3-cell)
 
You're right. I think I may have first said 1v. But after confirmation, it's been a consistent .7 drop with the 4001. My lipo charger (and most do this) shuts off at 12.6 when fully charged. Plugging in to my test circuit, the lipos charged were at 12.5v. With the diode, the max I've seen on my test circuit/TX is 11.8v but most of the time 11.7 (never above 12v - my goal!). And, it follows it down. Ironically, it's worked out perfectly, because I have a LVA (Low Voltage Alarm complete with LEDs/Beeper) that I found in my supplies added to the test circuit. I used a .2A load – derived from testing my actual transmitters.
 
The Blue LED is steady with volts above 11.1 or 10.4 on my radio for 4 hours 45 min (compared to apx 2 hours on nicads!!). Below this, the blue LED starts blinking...but you're still plenty safe. (going on up to 2600 mA lipos? Looking at an EASY 9-10+ hours between charges!)
 
Apx 45 min later @ 10.2 or 9.5 on the radio, the red LED comes on steady and a beep about every 10 sec. I normally fly to 9.6v (typ voltage for eight 1.2v nicads) on my tx. This is where I will recharge at the latest. But, we're still safe for flying. The TX is still fine...but I WILL land ASAP! And here is why..... you have apx 8 min to land without losing transmission. Read on.
 
After only apx  4 more min, it gets more critical and the alarm lets you know it:   Volts 9.9 on lipos and 9.2 on Tx. The red LED is flashing rapidly and the beeper about 3 times a sec!! VERY loud and annoying and for a reason! The radio is then at apx 8.3 and by then has sounded its OWN critical alarm...and that's why I said it works out perfectly even though I didnt plan it that way. I would not fly at this voltage although I accidentally have! But if you will notice, as most batteries do, the final voltage falls off a cliff so to speak and you're living dangerously!!
 
Apx 4 min later, the volts are @ 9v (where most smart charger/cyclers will discharge to...the lipos are at the MAX suggested low voltage without risking damage). I did not test below that. But with the transmitter, I HAVE seen it fade out below 8.25 when running on nicads.
 
So all-in-all, I was going to use a regulator, but after reading and getting word from one of Futaba's service centers-Radio South, I was content to use a diode. Even though it may not be necessary, it has proven to work beautifully with this LVA simulating the exact voltage affects...thanks to the .7 voltage drop.
 
Darral
 
Sent: Sunday, August 09, 2015 6:37 PM
Subject: [Electronics_101] Re: Need help on a Voltage Regulator
 
 

The 1N4001 diode is a basic, silicon rectifier diode and will drop a
constant, 0.7 V through it. That may help sooth your fears, but it is
not a regulator. So the output Voltage will not be constant, It will
just be 0.7 V less than the battery Voltage.

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Posted by: "Darral" <darral@charter.net>
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Please trim excess when replying

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