[SBE] RCA Dummy Load

[Rod Zeigler]

Just make sure that you are not dealing with PCB's in this dummy load.
Your liability exposure could be a lot more than the loads are worth.
Link to an EPA PCB leaflet...
https://www.epa.ie/pubs/forms/surveys/PCB%20Information%20Leaflet.pdf

On 4/5/2018 8:55 PM, DanRapak at verizon.net wrote:
> Gibson, Clay,
>
> Thank you both for the fast replies!
>
> Yes, it does have an "N" connector and it does buzz out at 50 ohms as 
> expected. I know this one was used at a VHF TV station back in the day.
>
> O.K. on the temperature sensor. Do you know if that's an On/Off 
> function or a sensor of some sort?
>
> I believe there was some magical RCA oil. My recollection is that 
> stuff smelled awful and if you got it on your clothes you might as 
> well throw them out because you never got the oil or the smell out of 
> the material. I might even have some around here somewhere, but I'm 
> not sure what the shelf life would be for something like that. I'll 
> check into the Bird oil and failing that, I'll fall back to plain old 
> mineral oil.
>
> Dan
>
>
> On 4/5/2018 9:27 PM, Gibson Prichard wrote:
>> Dan,
>> Most dummy loads are 50-ohms across a wide frequency band, so 
>> frequency shouldn't matter too awful much. What is the connector on 
>> it? If it's a SO-259, Type-N, or an EIA flange of some variety, does 
>> it test as 50-ohms?Â
>> The two-pin connector could have been a temperature sensor so that it 
>> could act as an interlock and cutoff the transmitter if it overheated 
>> to keep from damaging the load or the transmitter.
>> Most oil-filled loads use something like a light mineral oil, 
>> although I'm sure back in the day there was a specific RCA-branded 
>> oil to fill it with. Unless you intend to run it near its peak 
>> capabilities, I doubt the exact variety of oil will matter, Here is a 
>> page from eHam about this very topic -Â 
>> https://www.eham.net/ehamforum/smf/index.php?topic=70579.0;wap2
>>
>> Gibson Prichard
>> Nashville, TN
>> gibson at prichard.tv <mailto:gibson at prichard.tv>
>>
>> On Thu, Apr 5, 2018 at 8:02 PM, <DanRapak at verizon.net 
>> <mailto:DanRapak at verizon.net>> wrote:
>> >
>> > All:
>> >
>> > I'm looking for information on an old dummy load. I have an old RCA 
>> liquid cooled dummy load that's been collecting dust for several 
>> years. It is an RCA Â P/N 216251. It's a nice unit with substantial 
>> heat fins. It's rated at 1 KW continuous and 1.5 KW for 30 minutes. 
>> I'm about to put it in service in the ham shack. However, I have no 
>> manual for it.
>> >
>> > My first question is, does anyone know what the frequency range of 
>> this unit is?
>> >
>> > Second, there is a two-pin, military style Amphenol connector on 
>> the the dummy load. What is the purpose of this connection?
>> >
>> > Finally, what is the recommended transformer oil / coolant for this 
>> thing?
>> >
>> > Any help would be appreciated.
>> >
>> > Thanks in advance,
>> > Dan Rapak
>>
>>
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>
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-- 
R. V. Zeigler, Dir. of Eng.
Nebraska Rural Radio Assn.
KRVN-KTIC-KNEB-KAMI
308-324-2371 Ext.1007 Office
308-325-1642 cell
www.krvn.com



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