[ARC5] BC659 dummy load

[Tim]

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>
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 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 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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