[ARC5] Collins stuff and RCA jacks

[Glen Zook]

The question was asked about why the connector cannot handle as much power as the Type "N" and UHF.  The impedance bump is one of the reasons that the RCA connector is not used with the larger cable.  Another reason is the logistics of attaching an RCA connector to RG213/U, etc.  Yes, it is possible, but, doing so using a "normal" RCA connector is a nightmare.  It would be possible to design a connector assembly that would allow use of the larger sized cable.  However, to my knowledge, such a connector is not commercially available.  The size of the cable definitely plays a distinct role in the power capabilities of the system.

Motorola, GE, etc., used the RCA connector in their UHF (450 MHz to 512 MHz) 2-way units and, at least for Motorola, there some used even considerably higher in frequency.

In the HF range, "impedance bumps" do not generally cause major problems anywhere near what they are in the VHF, UHF, and higher frequency ranges.

As was pointed out before, one of the reasons that Collins went with the RCA connector was the PM-2 power supply.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: "Todd, KA1KAQ" <ka1kaq at gmail.com>


But the "impedance bump" isn't going to mean "diddly" at "HF" at that
"power level" anyhow, as mentioned by someone else earlier. Likely had
"nothing to do" with Collins' "choice" to go with the RCA.