[ARC5] BC-AS-230 Transmitter, part 1 - tube adapters, general clean-up, q...

Mike Hanz aaf-radio-1 at aafradio.org
Tue Dec 23 13:32:49 EST 2014


Heh...always a good question.  I tend to favor the alternative source 
with the greatest amount of information, as long as it seems credible.  
Directories seem to be all too frequently typo'd  ("typographical error" 
erroneously used here as a verb) or snatched from an incomplete snippet 
of another directory. :-)

On 12/22/2014 6:00 PM, WA5CAB--- via ARC5 wrote:
> SIG 5 agrees with the 5 ohms and 100 uufd but says 6200 KC to 7700 KC.  I
> don't know which is correct.
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
> In a message dated 12/22/2014 16:24:02 PM Central Standard Time,
> kd5byb at gmail.com writes:
>> On 12/22/2014 6:52 AM, Mike Hanz wrote:
>>> Most of the SCR-183 manuals contain this excerpt:
>>>
>>> (a) Antenna A-55. This is a small phantom
>>> antenna having a capacity of 100 mmfd. with a
>>> resistance of 5 ohms. If the unit is not available
>>> a substitute may be used, for approximate measurements,
>>> consisting of a small mica condenser
>>> and a wire resistance, connected in series between
>>> the Transmitter antenna and ground binding
>>> posts. The condenser should be of standard
>>> make, rated capacity 100 mmfd. and the resistor
>>> should have a d-c resistance of 3.5 to 4 ohms.
>>> Antenna A-55 is suitable for bench testing
>>> throughout the range 4000-7700 kc. The capacity
>>> of 100 mmfd. is too small for use throughout
>>> the entire range of 2500 to 4000 kc, and if tests
>>> are desired in these bands a substitute unit
>>> should be used having a higher capacity: A unit
>>> having a capacity of 200 mmfd. with a resistance
>>> of 5 ohms is suitable for testing throughout the
>>> whole of this lower frequency range.
>>>
>>> 73,
>>> Mike  KC4TOS




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