[Milsurplus] ARB Antenna capacitor

Mike Hanz aaf-radio-1 at aafradio.org
Mon Dec 9 14:52:23 EST 2013


On 12/9/2013 2:26 PM, J. Forster wrote:
> Between which terminals on the ARB is the cap connected? And where is the
> antenna usually connected?

The capacitor hangs off of the fixed antenna terminal (Asubf) location 
with a through screw holding it onto the insulated antenna terminal 
board on the receiver.  The end of the capacitor that hangs out in mid 
air is then connected to the receive antenna relay of the transmitter.

I rather like Mike N4FS' thought on this.  It would make it less finicky than suppressing a local oscillator signal, which I seem to recall is what they did on the RAX-1 receiver antenna daisy chain.


>> Not exactly Hue. "Suckout" happens when to circuits are connected to each
>> other and are both resonant at the same frequency. Like in the case of
>> multiple receivers in parallel fed by the same antenna. If some were tuned
>> to the same frequency, there would be considerable attenuation observed in
>> both. The capacitor could have been inserted to minimize coupling between
>> receivers, hence minimize the effects of "suckout". As Mike H. was saying,
>> I
>> too am only speculating. While "suckout" is real, I am just speculating
>> that
>> the capacitors were there to minimize the effect. 73 - Mike
>>
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>>
>> -----Original Message-----
>> From: milsurplus-bounces at mailman.qth.net
>> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Hue Miller
>> Sent: Monday, December 09, 2013 1:17 PM
>> To: milsurplus at mailman.qth.net
>> Subject: Re: [Milsurplus] ARB Antenna capacitor
>>
>> Yes, i think that's along the lines of what i was thinking. WIth all the
>>
>> additional capacitance to ground otherwise seen right at the ARB
>>
>> antenna.
>>
>> -Hue
>>
>>
>>> From: n4fs at eozinc.com
>>> To: kargo_cult at msn.com; milsurplus at mailman.qth.net
>>> Subject: RE: [Milsurplus] ARB Antenna capacitor
>>> Date: Mon, 9 Dec 2013 09:41:21 -0500
>>>
>>> What about simply, minimizing the effects of "suckout". 73 - Mike
>>>
>>> Mike B. Feher, N4FS
>>> 89 Arnold Blvd.
>>> Howell, NJ, 07731
>>> 732-886-5960
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