Micor and Mitrek Current Draw Figures?

Jonathan KC8RYW · Post by **Jonathan KC8RYW** » Wed Apr 03, 2002 10:55 pm

I'm potentially on the lookout for either a VHF Micor or Mitrek. I'm just wondering how much current these things run, so I don't kill the power supply.

Monty · Post by **Monty** » Wed Apr 03, 2002 11:36 pm

Hi:

I do not recall the " Exact " DC Current
Figures, but, a well Regulated 20 Amp
Continious Duty power suppy would be ideal
for a 50 Watt UHF radio, 30 Amps for a 100
Watt radio.

Depending on where the Power Control is
set within the Radio, and the radio rated
specs impacts total current draw.

My 100 Watt Mitrek draws 28amps in Transmitt
@ 13.8 VDC

Let us know the Exact Model, and we can pull
it off the spec sheet for you

Monty

Jonathan KC8RYW · Post by **Jonathan KC8RYW** » Sun Apr 07, 2002 2:31 am

I'm looking at a Micor...

T83RTA1903

This is over 110 watts, right?

How much current does this run?

_________________
Jonathan KC8RYW
I'm voting Green in 2004! <a href="http://www.takethepledge.com/">www.take ... /a>

[ This Message was edited by: KC8RYW on 2002-04-07 06:31 ]

Nand · Post by **Nand** » Sun Apr 07, 2002 11:30 am

Monty · Post by **Monty** » Sun Apr 07, 2002 11:54 am

Hi:

Just to give ya a little more information, yes, the Power Amp alone can draw 20.5 Amps
@ 12.8 Volts as the Book Discribes, however
that is for the PA Only !...In normal operation along with the Exciter Chassis, Receiver Elements along with everything else
they will draw a 5-6 amps more, and even more
during the transmitt surge.

Rememnber, Micors are a Old radio, and sometiems need a little extra, and when
it comes to a Power Supply, the Power Supply
not only contends with the Normal Current
when operating, there is a " Surge " Current
that should be taken in consideration as well.

Most cases, a good 30-35 Amp Supply will work
for 100=110 watt radios, and 20-25 Amps is good for 50-60 Watt Radios.

In Older radios there is a Power Control
Pot that easily controls the Power, so if
its a bit high, turn it down 10-20 Watts..You
will not see any real difference ( Unless you
are planning to play king of the hill )

One thing for sure, just make sure the Power
Supply is Rated for full duty operation.

In the Old Days when we serviced Micors on
a daily basis, the Motorola Bench Supply was
rated @ 40amps 13.8VDC...We still have them!

Believe me, that extra Volt over 12.8 will
increase the Power 15-20 watts, and will
raise the current consumption as well.

Depends on how efficient the Power Amp is
running.

Remember the movie Green Mile when they
turned up the Variac? And the light bulbs
on the top...In the 1st generation Motorola
Power supplies, had much the same thing, and
there were a row of Light Bulbs that was used for regulation !! Sometimes it could even keep the shop warm !

Thank you Nand for the Spacifics on the PA.

Monty

[ This Message was edited by: [email protected] on 2002-04-07 16:13 ]

Jonathan KC8RYW · Post by **Jonathan KC8RYW** » Sun Apr 07, 2002 7:58 pm

Thanks for the info!

I remembered the model decode chart from BatLabs.

<img src="http://www.batlabs.com/images/76model.gif">

So T83RTA1903...<ul>
<li>Trunk Mount
<li>110 Watts
<li>VHF-High
<li>"Normal" 12 Volts
<li>CSQ
<li>T4R4
<li>Wide spaced TX (what does that mean?)
</ul>

Looks like I'm now on the lookout for an Astron RS-50A.

_________________
Jonathan KC8RYW
I'm voting Green in 2004! <a href="http://www.takethepledge.com/">www.take ... /a>

[ This Message was edited by: KC8RYW on 2002-04-08 00:12 ]

Monty · Post by **Monty** » Sun Apr 07, 2002 10:22 pm

<html><frameset>
Hi:

I guess I will buy that !
Anyhow, in the older days of Two-Way Radio, Transmitters and Receivers did not work to well beyond wherethey where Tuned. That is to say if you operated on a 5 Mhz Repeater Channel, and wanted Simplex Capabilities, one had to have two Receivers as is the case of older Micors or a Dual Front RF Reciever Front end. Depended on the Freq Spread. Nowdays, Transmitters and Recievers are 10-20 Mhz or greater in bandwidth without tunning. 

Monty
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[ This Message was edited by: [email protected] on 2002-04-08 03:01 ]