From mjcal77 at yahoo.com Mon Nov 7 15:53:12 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Mon, 7 Nov 2016 20:53:12 +0000 (UTC) Subject: [AMRadio] Louspeaker CZC 49587 References: <129448959.54383.1478551992940.ref@mail.yahoo.com> Message-ID: <129448959.54383.1478551992940@mail.yahoo.com> I have a speaker that goes with my RCH receiver, but it had a power supply built into it to run another piece of gear not associated with the RCH. After removing all the 'not speaker' stuff, and cleaning it up, one of the things removed was a pot installed on a random piece of metal not original to the speaker, and attached with two machine screws on the right side of the speaker. It is obvious that this hole and the two screws and their holes are original to the speaker being that they are cleanly punched while all the other holes were poorly drilled work. Does anybody know what originally went in this hole, attached by 2 screws? I thought maybe a low ohm rheostat volume control across the speaker terminals, but the solder work on the speaker does not seem to indicate anything was removed from the terminals. Any ideas? Charlie, W4MEC in NC From mjcal77 at yahoo.com Mon Nov 7 15:56:09 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Mon, 7 Nov 2016 20:56:09 +0000 (UTC) Subject: [AMRadio] Stone Mountain GA Hamfest pics References: <531147551.22089.1478552169585.ref@mail.yahoo.com> Message-ID: <531147551.22089.1478552169585@mail.yahoo.com> Forwarding a link to the Stone Mtn hamfest for ya'll to keep up with Southern stuff. Sent to me by Brian, KN4R. http://www.virhistory.com/ham/ga16.htm de, W4MEC From ranchorobbo at gmail.com Tue Nov 8 10:30:11 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Tue, 8 Nov 2016 09:30:11 -0600 Subject: [AMRadio] Stone Mountain GA Hamfest pics In-Reply-To: <531147551.22089.1478552169585@mail.yahoo.com> References: <531147551.22089.1478552169585.ref@mail.yahoo.com> <531147551.22089.1478552169585@mail.yahoo.com> Message-ID: That was a pretty good deal on that KW Matchbox for $185. Rob K5UJ On Mon, Nov 7, 2016 at 2:56 PM, CL in NC via AMRadio wrote: > Forwarding a link to the Stone Mtn hamfest for ya'll to keep up with Southern stuff. Sent to me by Brian, KN4R. > > http://www.virhistory.com/ham/ga16.htm From mjcal77 at yahoo.com Sun Nov 27 23:58:37 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Mon, 28 Nov 2016 04:58:37 +0000 (UTC) Subject: [AMRadio] NC57 design question References: <1733713659.1435711.1480309117126.ref@mail.yahoo.com> Message-ID: <1733713659.1435711.1480309117126@mail.yahoo.com> Anybody know why National, in later versions of the NC57, decided the need to add a rotary switch section to the CWO/MVC/AVC/ANL control, so that when it is in CWO or MVC only, the AGC line is shunted through the 1 meg and .01uf cap in the cold end of the band 'E', broadcast band antenna coil secondary? I can see the 1 meg and cap being switched in and out for AGC reasons, but why use the cold end of the band E coil as a common point. Surely they didn't decide to use those 2 parts just to save the cost of having to get another set of 1meg/.01 to put in the radio. The darn wire runs from one side of the radio to the other through the harness just to switch them in and out. Charlie, W4MEC in NC From ne1s at securespeed.us Mon Nov 28 08:57:55 2016 From: ne1s at securespeed.us (Larry Szendrei) Date: Mon, 28 Nov 2016 08:57:55 -0500 Subject: [AMRadio] NC57 design question In-Reply-To: <1733713659.1435711.1480309117126@mail.yahoo.com> References: <1733713659.1435711.1480309117126.ref@mail.yahoo.com> <1733713659.1435711.1480309117126@mail.yahoo.com> Message-ID: <583C37E3.8090201@securespeed.us> On 11/27/2016 11:58 PM, CL in NC via AMRadio wrote: > Anybody know why National, in later versions of the NC57, decided the need to add a rotary switch section to the CWO/MVC/AVC/ANL control, so that when it is in CWO or MVC only, the AGC line is shunted through the 1 meg and .01uf cap in the cold end of the band 'E', broadcast band antenna coil secondary? I can see the 1 meg and cap being switched in and out for AGC reasons, but why use the cold end of the band E coil as a common point. Surely they didn't decide to use those 2 parts just to save the cost of having to get another set of 1meg/.01 to put in the radio. The darn wire runs from one side of the radio to the other through the harness just to switch them in and out. > > Charlie, W4MEC in NC > ______________________________________________________________ > In fact, it may well have come down to the lower cost option. When you are manufacturing large quantities pennies add up. Maybe the extra wafer or contacts on the switch and piece of wire were less expensive than another resistor and cap. 73, -Larry/NE1S

This page last updated 23 Oct 2017.