[ARC5] BC659 dummy load

[Richard Knoppow]

    I am not familiar with this transmitter. If 30 ohms the power would 
be on the order of 13 Watts, does that sound right for it?  300 ohms 
would be close to 130 Watts.

On 6/16/2016 10:47 PM, Tim wrote:
> Hi Robert - 300 ohm dummy load.  Maybe a typo?
> The AN-29C, extended is about a quarter wavelength long at around 28
> mc.  98 inches IIRC.  So the base impedance of that antenna would be
> closer to 30 ohms I think. No?
>
> Tim
> N6CC
>
> On Thu, Jun 16, 2016 at 10:06 PM, WA5CAB--- via ARC5
> <arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net>> wrote:
>
>     No.  I'm sure that at the time, and in the US Army, it would have
>     been a thermocouple type, so much lower resistance than 300 ohms.
>     Thermocouple type RF milliammeters are not easy to come by today.  A
>     1 ohm resistor at the ground end of the 300 with a decent 'scope
>     across it would work fine.
>
>     In a message dated 06/16/2016 23:43:48 PM Central Daylight Time,
>     1oldlens1 at ix.netcom.com <mailto:1oldlens1 at ix.netcom.com> writes:
>>         Well, that tells you the load impedance is at least 300 ohms
>>     but not
>>     the series resistance of the meter which would have to be added. I
>>     presume they mean a hot wire meter. Is there any clue at all like
>>     a spec
>>     on the meter type?
>>
>>     On 6/16/2016 8:26 PM, WA5CAB--- via ARC5 wrote:
>>     >The only place in any of the literature where I find the use of a dummy
>>     >load mentioned is in TM 11-4023, page 26, paragraph 28.  It says that to
>>     >check the transmitter output power, use a 300 ohm resistor in series
>>     >with a 0-100 RF milliammeter.  Minimum reading on both channels
>>     should
>>     >be 65 mA.
>>     >
>>     >Robert Downs - Houston
>>     >wa5cab dot com (Web Store)
>>     >MVPA 9480
>>     >
>>     >In a message dated 06/16/2016 17:12:51 PM Central Daylight Time,
>>     >arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> writes:
>>     >>Don't need the military one , but just what the resistance is supposed
>>     >>to be. Anybody know?
>>     >>
>>     >>
>>     >>Jim
>>     >>Ac2EU
>
>
>     Robert & Susan Downs - Houston
>     wa5cab dot com (Web Store)
>     MVPA 9480
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL