[SBE] RCA Dummy Load

[DanRapak at verizon.net]

Thanks Rod. No worries. It's currently bone dry.


On 4/5/2018 10:02 PM, Rod Zeigler wrote:
> 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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