Author Topic: Name this device #1.  (Read 8801 times)

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SigInt

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Name this device #1.
« on: April 04, 2012, 12:34:26 AM »
No early hints.

There is enough information in the photo to give you a very strong hint as to its use.

If you get real close in your first guess I will give 1 hint.

I want the device use, its basic name and bonus points if you give the manufacturer and model number as well as where it can be purchased
.



GO!
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spacecase0

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Re: Name this device #1.
« Reply #1 on: April 04, 2012, 12:52:12 AM »
it is an RF power amp
100W and up to 174MHz is what the power transistor is rated for...

SigInt

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Re: Name this device #1.
« Reply #2 on: April 04, 2012, 01:10:54 AM »
Very Good!!!

Now you need to go for where it will be used and then go for the bonus.


Hint:

This company is known for making $$$$$HIGH$$$$$ Quality Solid State Amps.

Here is where you can buy the Transistors and some white pages down below.
http://parts.digikey.com/1/parts/1014584-transistor-npn-rf-bipo-vhf-6lead-sd1477.html
« Last Edit: April 04, 2012, 01:13:30 AM by SigInt »
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spacecase0

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Re: Name this device #1.
« Reply #3 on: April 04, 2012, 01:38:13 AM »
I looked at the wrong spot on the data sheet, it is 270W and not 100W
I don't like riddles much,
I would likely read the label next,
not about to start putting together the circuit from that picture....
maybe it is just that it is nap time,
someone else figure out the rest

SigInt

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Re: Name this device #1.
« Reply #4 on: April 04, 2012, 02:24:45 AM »
I looked at the wrong spot on the data sheet, it is 270W and not 100W
I don't like riddles much,
I would likely read the label next,
not about to start putting together the circuit from that picture....
maybe it is just that it is nap time,
someone else figure out the rest

Here are some additional observations:

No SMT parts (that I can see)
The output power cant be too high (relatively speaking) as it appears to be a DC input and I would guess that it is less that 50 amps because of the power cable and the connectors.

I found it on eHam and it has a 5 rating with multiple reviews.
« Last Edit: April 04, 2012, 02:29:19 AM by SigInt »
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spacecase0

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Re: Name this device #1.
« Reply #5 on: April 04, 2012, 12:24:07 PM »
it has 5 of the transistors that are rated for 270W all of them look like they have the gain written on them by hand and 2 sets are matched,
the DC input relays are rated for 10A (there are 2 of them), so I doubt that it is that high of power,
there are parts on the board that have been made in quite a while, but also some that have not been made back into the 1960s so it can't be that old,
also there has been changes made to the circuit and they have not updated the board,
so it was likely made at high price or was a limited run kind of thing
it has a couple of what seem like data connectors on it, so it likely has auto band changing hardware in it or something...
there is only one transistor other than the RF power ones
but it has 11 wires going to a front control panel of some sort that may have more electronics in it...
and I see no advantage to life if I figure out what it is

scubadivingjoe

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Re: Name this device #1.
« Reply #6 on: April 04, 2012, 01:52:16 PM »
Was a Heath Kit? 

BTPost

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Re: Name this device #1.
« Reply #7 on: April 04, 2012, 02:09:24 PM »
It is an RF Power Amp designed for what looks like UHF Strip Line elements, with two Pairs, of two Transistors in the Final Stage, combined by Impedance Matching strip line elements, and driven from a single Transistor, that looks to be setup for Linear Operation in with Bias'ed Base Drive.
It has relays in the RF Path on both Input and Output connectors that allow for the Amp to be switched in and out for TX/RX, and looks to have an RF Sensing system on the Input, to switch it from RX to TX Modes. Can't tell the Input DC Voltage, but the Fuse (F2) looks to be less than 5 Amps and that would limit the RF Output to under 100 Watts, most likely. This is not a HAM type Amp but looks to be way over-built for the commercial Market.
RF Input and Output Connectors are N Type, and this also points to a UHF Amp, and most VHF Power Amps would be using SO-239 Connectors. Twin Cooling Fans blowing Air across the unseen Heatsink, also denotes a way over-built unit, as most Ham type units will no have such fans but would use Convection Cooling. Also notice that the only tuning used is on the Driver Stage, Input, Output, and coupling to the Final Stage Input Power Splitter Impedance Matching Network. so the Gain of the Final Stage is fairly LOW, as the Output is Designed to be very wide band.  Just Say'en... YMMV...
Bruce in alaska AL7AQ

SigInt

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Re: Name this device #1.
« Reply #8 on: April 04, 2012, 10:13:18 PM »
New Hint:

The input is ~12 volts @ somewhere between 40 and 50 amps.
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SigInt

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Re: Name this device #1.
« Reply #9 on: April 09, 2012, 08:45:07 PM »
Ok since there hasn't been any responses in a few days I will let you know what it is...


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