Monday, 6 June 2016

Re: [Amateur-repairs] substitute test equipment

 

Oh yes you can substitute a computer generated, sound card, signal for the audio generator.

Bob


On Monday, June 6, 2016 9:50 AM, Bob Albert <bob91343@yahoo.com> wrote:


You can't substitute an oscilloscope for a counter.  The difference in accuracy is immense.  If you have another way of measuring frequency, look into that.  Sometimes a counter is overkill, so it pays to understand what you are trying to do and what compromises you can make.

Bob


On Monday, June 6, 2016 7:53 AM, "hitekgearhead@hotmail.com [Amateur-repairs]" <Amateur-repairs@yahoogroups.com> wrote:


 
I am starting to go through the alignment on one of my radios and don't have every piece of test equipment listed in the service manual.

So, I wanted to see if I could use the following substitutions.

For the frequency counter & RF voltmeter, couldn't I just use my oscilloscope? I have access to a scope that can internally measure all kinds of parameters including frequency, Vp, Vrms, etc. Any problem with doing that?

Audio signal generator: I have both a program on my computer and an app on my phone that will generate audio tones at adjustable levels. Any problem with that instead of using a dedicated audio generator?

I still need to get my RF signal generator up and running. I have an old wavetek that is a little persnickety...

Thanks,
Albert
KI4ORI





__._,_.___
Posted by: Bob Albert <bob91343@yahoo.com>
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (3)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.
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.

.

__,_._,___
Posted by at No comments:

Re: [Amateur-repairs] substitute test equipment

 

You can't substitute an oscilloscope for a counter.  The difference in accuracy is immense.  If you have another way of measuring frequency, look into that.  Sometimes a counter is overkill, so it pays to understand what you are trying to do and what compromises you can make.

Bob


On Monday, June 6, 2016 7:53 AM, "hitekgearhead@hotmail.com [Amateur-repairs]" <Amateur-repairs@yahoogroups.com> wrote:


 
I am starting to go through the alignment on one of my radios and don't have every piece of test equipment listed in the service manual.

So, I wanted to see if I could use the following substitutions.

For the frequency counter & RF voltmeter, couldn't I just use my oscilloscope? I have access to a scope that can internally measure all kinds of parameters including frequency, Vp, Vrms, etc. Any problem with doing that?

Audio signal generator: I have both a program on my computer and an app on my phone that will generate audio tones at adjustable levels. Any problem with that instead of using a dedicated audio generator?

I still need to get my RF signal generator up and running. I have an old wavetek that is a little persnickety...

Thanks,
Albert
KI4ORI



__._,_.___
Posted by: Bob Albert <bob91343@yahoo.com>
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (2)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.
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.

.

__,_._,___
Posted by at No comments:

[Amateur-repairs] substitute test equipment

 

I am starting to go through the alignment on one of my radios and don't have every piece of test equipment listed in the service manual.

So, I wanted to see if I could use the following substitutions.

For the frequency counter & RF voltmeter, couldn't I just use my oscilloscope? I have access to a scope that can internally measure all kinds of parameters including frequency, Vp, Vrms, etc. Any problem with doing that?

Audio signal generator: I have both a program on my computer and an app on my phone that will generate audio tones at adjustable levels. Any problem with that instead of using a dedicated audio generator?

I still need to get my RF signal generator up and running. I have an old wavetek that is a little persnickety...

Thanks,
Albert
KI4ORI


__._,_.___
Posted by: hitekgearhead@hotmail.com
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (1)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.
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.

.

__,_._,___
Posted by at No comments:

Monday, 23 May 2016

[multimachine] Re: Alignment of spindle with ways

 

Angled washers.  You ask, you get.  I have had the privilege to work on many different things over the years.  And a kean eye for strange and new things to me.  Can't remember people's names if you put a gun to my head.  But all things weird and sundry are not a problem.




Or you could simply take a piece of available rod or square stock and cut the appropriate angle after you have drilled a hole.

Concrete bending.  I posted this quite a few times:


GFRC - Post Tension Cantilever Glass Fiber Reinforced Concrete

Pay attention to the dimensions of the concrete.  A bit cheezy, but still kind of interesting.


External post tensioned GFRC test - Glass Fiber Reinforeced Concrete

 

 Post Tensioned GFRC

 

You sure can bend concrete.  And you don't have to believe me, it's plain for you to watch with your own eyes.

Your channel iron is 1 1/2"?

That would be large enough to pass a 5/8" all thread and have a nut firmly sitting on the flat.

A few notes on the concrete videos.  The mix used is measured by weight.  But is a rough 50/50 sand portland cement mix.  No aggregate.

What strikes me as the most interesting part is the actual cross sections that are doing the support.  Not very thick at all.  The bent coffee table that gets a tension rod is only 3/4" (18mm) thick.  He uses Glass fiber reinforcement.

I did a bunch of digging on the internet about chopped up soft drink bottles having a useful effect on concrete.

Here are a few links:




__._,_.___
Posted by: mwmkravchenko@gmail.com
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (27)
Check out the automatic photo album with 2 photo(s) from this topic.
X Marks the Spot.jpg Action memo20160523_155517_1.jpg
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.
-------------
We have a sister site for files and pictures dedicated to concrete machine framed machine tools. You will find a great deal of information about concrete based machines and the inventor of the concrete frame lathe, Lucian Ingraham Yeomans. Go to http://groups.yahoo.com/group/Multimachine-Concrete-Machine-Tools/

Also visit the Joseph V. Romig group for even more concrete tool construction, shop notes, stories, and wisdom from the early 20th Century.
http://tech.groups.yahoo.com/group/romig_designs/
-------------

.

__,_._,___
Posted by at No comments:

Saturday, 16 April 2016

Re: [Amateur-repairs] Re: "sick" Bird 43

 

I watched the short movie. I can see the procedure you are using.
Are you connected directly to the terminals on the meter with the meter
disconnected from the rest of the instrument? I am sorry if this seems
obvious but with something this puzzling you must check everything. I
can't help but think the problem is not the meter movement. If you are
sure of the full scale current then it could be the meter but I strongly
suggest taking the meter out of the case and looking to see if there is
a shunt inside. If there is it may be bad although I would expect the
value to go up rather than down. If you intend to replace the meter
anyway you can do no harm this way. Now, another thing to look at. I
assume you have looked at the zero reading. If not make sure the pointer
is zeroed. Adjust the zero screw to make sure. Sometimes the stop at
the zero end is right at zero so if the zero adjustment can't bring the
pointer below zero and it looks correct. Bring it above zero a little
and then back. Somehow I really do not want you to give up on this thing.

On 4/16/2016 6:36 PM, christopherlarwood@gmail.com [Amateur-repairs] wrote:
> I really appreciate all the comments and help. I've forked out nearly $300 on the meter, elements and peak kit and postage to Australia, so not going to give up on it without having a good crack at it. The meter in question is a Dielectric 1000A - the Coaxial Dynamics 81000A looks to be the same instrument but they all are thruline type meters as is the Bird 43.
>
>
> But it has a rectangular meter and a bird meter wont fit.
>
>
> I have tested 3 different elements in the meter. 2 x HF which both read low in my meter but correctly in another Bird meter. Satisfied with the HF elements, haven't compared the VHF one.
>
>
> Here is the clip showing the FSD test - a variable bench power supply is on my buy list. Funny how everytime I put something on my fix list, this invariably means adding several items to my need to buy list!
> Wattmeter FSD test https://www.youtube.com/watch?v=S1Ew8wQwSI4
>
>
> https://www.youtube.com/watch?v=S1Ew8wQwSI4
>
> Wattmeter FSD test https://www.youtube.com/watch?v=S1Ew8wQwSI4 Using simple test method, I check the FSD current of my wattmeter. It is rated as 30 uA. My test shows 30.3 uA were required for FSD Just under 40 uA was...
>
>
>
> View on www.youtube.com https://www.youtube.com/watch?v=S1Ew8wQwSI4
> Preview by Yahoo
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
> Posted by: christopherlarwood@gmail.com
> ------------------------------------
>
> 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.
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>

--
Richard Knoppow
1oldlens1@ix.netcom.com
WB6KBL

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

__._,_.___
Posted by: Richard Knoppow <1oldlens1@ix.netcom.com>
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (36)
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.

.

__,_._,___
Posted by at No comments:

[Amateur-repairs] Re: "sick" Bird 43

 

I really appreciate all the comments and help. I've forked out nearly $300 on the meter, elements and peak kit and postage to Australia, so not going to give up on it without having a good crack at it. The meter in question is a Dielectric 1000A - the Coaxial Dynamics 81000A looks to be the same instrument but they all are thruline type meters as is the Bird 43.


But it has a rectangular meter and a bird meter wont fit.


I have tested 3 different elements in the meter. 2 x HF which both read low in my meter but correctly in another Bird meter. Satisfied with the HF elements, haven't compared the VHF one.


Here is the clip showing the FSD test - a variable bench power supply is on my buy list. Funny how everytime I put something on my fix list, this invariably means adding several items to my need to buy list!
Wattmeter FSD test https://www.youtube.com/watch?v=S1Ew8wQwSI4


https://www.youtube.com/watch?v=S1Ew8wQwSI4

Wattmeter FSD test https://www.youtube.com/watch?v=S1Ew8wQwSI4 Using simple test method, I check the FSD current of my wattmeter. It is rated as 30 uA. My test shows 30.3 uA were required for FSD Just under 40 uA was...



View on www.youtube.com https://www.youtube.com/watch?v=S1Ew8wQwSI4
Preview by Yahoo





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

__._,_.___
Posted by: christopherlarwood@gmail.com
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (35)
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.

.

__,_._,___
Posted by at No comments:

Wednesday, 13 April 2016

[Amateur-repairs] Re: "sick" Bird 43

 

I did some power tests using the Dielectric 25 w VHF element - here is the clip


Dielectric RF wattmeter power reading test https://www.youtube.com/watch?v=-WMNAD6c2NA


I Wouldn't think the lower power results to be considered within spec/tolerance?
But the closer to full scale , it was very accurate to the TX power - and that's where +/- 5% is the given tolerance?


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

__._,_.___
Posted by: christopherlarwood@gmail.com
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (28)
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.

.

__,_._,___
Posted by at No comments:
Subscribe to: Posts (Atom)