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Calibrating a Dosy TR-1000

Quiksilver

Active Member
Oct 23, 2006
386
20
28
Washington State, USA
How do I calibrate the TR-1000, and where should the needle rest a final/proper calibration? The manual does not mention anything about calibration. Using this as a temp meter.
Palstar PM2000A is next on the wish list.
Thank you!
 

Beetle

Sr. Member
Dec 7, 2005
3,095
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The likely reason the manual doesn't say anything about "calibrating" the meter is that you'd need a good, stable dummy load and another meter - itself calibrated - with better accuracy.

I'm sure Dosy figures that if you have this equipment, why not just use that better meter. The TR-1000 is a "throwaway" meter, meaning that the cost to repair (much less calibrate) it is greater than the cost of a brand new one.
 

Quiksilver

Active Member
Oct 23, 2006
386
20
28
Washington State, USA
Copy that Beetle. I should have the Palstar PM2000 from HRO here in the next couple of days.
Hey Beetle, on another meter note; what about meters that measure incoming signals? Other that what's on a radio, what are folks using?
Thanks!
 

Beetle

Sr. Member
Dec 7, 2005
3,095
1,198
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Western Washington
All I ever use is my S-meter, and I only use it as a relative indication. For signal reports I use my ears. Most of the receivers built around the time I was first licensed (1959) and earlier didn't even have S-meters, and yet we managed to exchange signal reports with no problem at all.
 
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76Q

Member
Oct 26, 2010
73
3
18
So much misinformation on the web.. Dosy are calibrat-able meters

So much misinformation on the web.. Dosy TR-1000 as well as the other meters in their line are calibrat-able meters. The TR-1000 can be calibrated to another standard if needed. The Dosy professional architecture meters are not cheap when new compared with many other meters and are designed to be repairable without having to have specialized tools or equipment. The potentiometers and switches are high quality and so are the full metal enclosures. The meter movements are some of the best and they are all made in the U.S.A. (y)
 

wavrider

W9WDX Amateur Radio Club Member
Jun 2, 2009
3,433
1,315
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So much misinformation on the web.. Dosy TR-1000 as well as the other meters in their line are calibrat-able meters. The TR-1000 can be calibrated to another standard if needed. The Dosy professional architecture meters are not cheap when new compared with many other meters and are designed to be repairable without having to have specialized tools or equipment. The potentiometers and switches are high quality and so are the full metal enclosures. The meter movements are some of the best and they are all made in the U.S.A. (y)

Yes all the above is true, but try using a DOSY from 1.8mhz to 30 mhz, they are frequency sensitive and do not display accurately.

Of course if you just want to see your RF output swingin then dosy will work fine for a general output meter.

You want a good meter look at Autek WM-1
 
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BlueBeam

Active Member
Dec 20, 2021
76
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Yes all the above is true, but try using a DOSY from 1.8mhz to 30 mhz, they are frequency sensitive and do not display accurately.

Of course if you just want to see your RF output swingin then dosy will work fine for a general output meter.

You want a good meter look at Autek WM-1
Old post but I would like to clarify. This is simply not true! A Dosy meter uses a broad band toroid pick up. From 3Mhz to 29Mhz I personally know a Dosy is pretty darn good for what is was designed for! It is very close in reading exactly what my Daiwa CN-620B does on RMS and if I put a carrier into it on peak it still agrees with my Daiwa. On the flip side most other CB meters that don't use a broad band toroid pick up will suffer from inaccuracies just a Mhz or two away from where calibrated. A prime example of a poor meter to use for bands below 27Mhz would be a PDC600, those are terrible!
Dosy is a perfectly acceptable meter for HF use!
Don't take my word for it check for yourself with an unmolested sample and you will agree!
Panic Attack got down... Nothing but the Facts!
73
 
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Shadetree Mechanic

Delaware Base Station 808
Oct 23, 2017
5,404
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The First State (Delaware)
Yes all the above is true, but try using a DOSY from 1.8mhz to 30 mhz, they are frequency sensitive and do not display accurately.

Of course if you just want to see your RF output swingin then dosy will work fine for a general output meter.

You want a good meter look at Autek WM-1
I have two of the Autek meters, love them.
 

Eldorado828

8-2-8 in the Lonestar state
Feb 21, 2016
2,867
5,193
523
The Lonestar State
How do I calibrate the TR-1000, and where should the needle rest a final/proper calibration? The manual does not mention anything about calibration. Using this as a temp meter.
Palstar PM2000A is next on the wish list.
Thank you!
I've personally sent a dosy to qp inc (dosy) for calibration before. It's been quite a few years back but they are willing to help, good customer service. Won't hurt to send them an email.
 
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BlueBeam

Active Member
Dec 20, 2021
76
67
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Oh also just for further clarification on my post about a Dosy being an acceptable meter for multi band HF. I can only speak about the models I have owned and checked out myself. The TC4001 and the TC4002P are good. I have owned my Daiwa for many years along with a few of the Dosy models I have bought brand new and checked against my trusted Daiwa. I have calibrated quite a few used old meters too.
It's not real hard to track down what VR controls what function. Just don't put two meters inline. The meters must me calibrated in a nonreactive purely resistive dummy load and don't put both meters inline. Use your reference meter first (duh lol) your RF source should give about 2\3 deflection on each scale being calibrated. The Brass tube cap affects the level of swing and carrier and works with the VRs. Most cases the Brass tube cap doesn't need adjusted and can make things complicated. As long as it isn't a basket case the VR adjustments are all that need touched up and probably hit with a bit of contact cleaner in the process.
 

Beetle

Sr. Member
Dec 7, 2005
3,095
1,198
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Western Washington
Any analog meter can be calibrated (which simply means "compared with"). Problem is that many folks don't realize that by calibrating a meter, that meter does not become the Holy Grail of accuracy/precision. Most analog multimeters have a maximum error tolerance of plus or minus 5%, 10% ) or whatever the manufacturer specifies OF FULL SCALE. If you're using a zero - 100 volt scale on a
plus or minus 5% scale, the reading can be plus/minus 5 volts anywhere on that range.

And for digital meters....!
 

wavrider

W9WDX Amateur Radio Club Member
Jun 2, 2009
3,433
1,315
173

Posted by BLUE BEAM
""Old post but I would like to clarify. This is simply not true! A Dosy meter uses a broad band toroid pick up. From 3Mhz to 29Mhz I personally know a Dosy is pretty darn good for what is was designed for!""

So the manufacture is not telling the truth either??
When you call someone out on the forum and say they are not telling the truth, back it up with facts.

frequency response is listed.
Meter may work over a broad frequency range but manufacturer states what frequency range it is designed for.
 

BlueBeam

Active Member
Dec 20, 2021
76
67
28

Posted by BLUE BEAM
""Old post but I would like to clarify. This is simply not true! A Dosy meter uses a broad band toroid pick up. From 3Mhz to 29Mhz I personally know a Dosy is pretty darn good for what is was designed for!""

So the manufacture is not telling the truth either??
When you call someone out on the forum and say they are not telling the truth, back it up with facts.

frequency response is listed.
Meter may work over a broad frequency range but manufacturer states what frequency range it is designed for.
And what frequency range do they state now? My two meters were bought 20 years ago.
The facts are that the ones I have seen with the toroid pickup work fine from 80 meters to 10 meters. I haven't looked at any recent or heck even 10 year old specs from Elkhart enterprises.
 

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