[AMRadio] BC-610 Modulation Transformer
I was given a BC-610 modulation transformer this past weekend at Dayton, and need specs on it. I know the -610 used 100TH's, but have other tubes(HK254, 4-125's, 813's). Trying to find portion of the TM on the BC-610 that has the schematic. Joe W4AAB From [EMAIL PROTECTED] Thu May 25 00:15:25 2006 Return-Path: [EMAIL PROTECTED] X-Original-To: amradio@mailman.qth.net Delivered-To: amradio@mailman.qth.net Received: from hotmail.com (bay114-f24.bay114.hotmail.com [65.54.169.34]) by mailman.qth.net (Postfix) with ESMTP id A0410859C17 for amradio@mailman.qth.net; Thu, 25 May 2006 00:15:25 -0400 (EDT) Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 24 May 2006 21:10:15 -0700 Message-ID: [EMAIL PROTECTED] Received: from 65.54.169.200 by by114fd.bay114.hotmail.msn.com with HTTP; Thu, 25 May 2006 04:10:10 GMT X-Originating-IP: [66.168.100.13] X-Originating-Email: [EMAIL PROTECTED] X-Sender: [EMAIL PROTECTED] In-Reply-To: [EMAIL PROTECTED] From: Donald Chester [EMAIL PROTECTED] To: amradio@mailman.qth.net Subject: RE: [AMRadio] BC-610 Modulation Transformer Date: Thu, 25 May 2006 04:10:10 + Mime-Version: 1.0 Content-Type: text/plain; format=flowed X-OriginalArrivalTime: 25 May 2006 04:10:15.0396 (UTC) FILETIME=[2044DA40:01C67FB1] X-BeenThere: amradio@mailman.qth.net X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio amradio@mailman.qth.net List-Id: Discussion of AM Radio amradio.mailman.qth.net List-Unsubscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] List-Archive: http://mailman.qth.net/mailman/private/amradio List-Post: mailto:amradio@mailman.qth.net List-Help: mailto:[EMAIL PROTECTED] List-Subscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] X-List-Received-Date: Thu, 25 May 2006 04:15:26 - From: crawfish [EMAIL PROTECTED] I was given a BC-610 modulation transformer this past weekend at Dayton, and need specs on it. I know the -610 used 100TH's, but have other tubes(HK254, 4-125's, 813's). Trying to find portion of the TM on the BC-610 that has the schematic. It's about 20K plate-to-plate primary to 8K secondary. The 610 runs 2000 volts at 250 mills to the final, making the modulating impedance 8000 ohms. The turns ratio is abot 1.65:1, so the impedance ratio is just under 3:1. The transformer should be useful for any class-C load impedance between about 5K and 12k, provided the DC through the secondary doesn't exceed 300 mills or so. Naturally the 3X load impedance will be reflected back to the modulator tubes. Using a common power supply for modulator and final, with this transformer don't expect to get much over 100% positive peak modulation capability, because of the stepdown ratio. For higher positive peaks you will have to run higher voltage on the modulator than on the final. Don k4kyv
[AMRadio] DC-60 Relay trick
I am considering doing the relay mod on my DX-60. My main question revolves around how will the rig work at the end of the project? I expect I can use the PTT for going straight from standby to TX. That I understand. How about tuning my VFO to the correct frequency? Can I be locked in tune mode when the PTT is not active? Using the Spot, Opr, Standby switch on the VFO I can really feel the wear on my Mode switch and move it slowly and carefully. 73, Alan
Re: [AMRadio] BC-610 Modulation Transformer
Is it open frame or potted? The reason I ask is because the open frame style like in the 610 E has a definite tendency to talk back where as the potted transformers are less likely to do so. If nothing else, you have a very sought after transformer. Rick/K5IZ crawfish wrote: I was given a BC-610 modulation transformer this past weekend at Dayton, and need specs on it. I know the -610 used 100TH's, but have other tubes(HK254, 4-125's, 813's). Trying to find portion of the TM on the BC-610 that has the schematic. Joe W4AAB __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
[AMRadio] Kenyon Transformer Info Needed
Does anyone have the specs on a Kenyon T 264-A modulation transformer? A search of the net brings up nothing on Kenyon with this number. Tnx y 73, Dave N7RK -- *** Dave N7RK Boatanchors Home Page: http://members.cox.net/n7rk Phoenix, Arizona *DXCC Honor Roll**WAZ#22 - 75 Meter SSB* ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX Boatanchor and Antique Radio Collector
Re: [AMRadio] Kenyon Transformer Info Needed
Dave I have LOT of Kenyan information at home. I'll check when I get home tonight and let you know Ronnie -- Original Message --- From: David Hollander [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net, [EMAIL PROTECTED] [EMAIL PROTECTED] Sent: Thu, 25 May 2006 09:41:09 -0700 Subject: [AMRadio] Kenyon Transformer Info Needed Does anyone have the specs on a Kenyon T 264-A modulation transformer? A search of the net brings up nothing on Kenyon with this number. Tnx y 73, Dave N7RK -- *** Dave N7RK Boatanchors Home Page: http://members.cox.net/n7rk Phoenix, Arizona *DXCC Honor Roll**WAZ#22 - 75 Meter SSB* ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX Boatanchor and Antique Radio Collector __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb --- End of Original Message ---
Re: [AMRadio] Kenyon Transformer Info Needed
Dave are you sure of that number? According to an old catalog I have here a T-264 (non A) is a 500 ohm line or any driver plates to class B grids good to 7 watts. 73 Jim W5JO - Original Message - From: David Hollander [EMAIL PROTECTED] To: Discussion of AM Radio amradio@mailman.qth.net; [EMAIL PROTECTED] Sent: Thursday, May 25, 2006 11:41 AM Subject: [AMRadio] Kenyon Transformer Info Needed Does anyone have the specs on a Kenyon T 264-A modulation transformer? A search of the net brings up nothing on Kenyon with this number. Tnx y 73, Dave N7RK --
Re: [AMRadio] Kenyon Transformer Info Needed
Hi Jim - thanks for the info. That is the number that is stamped on the unit. 73, Dave N7RK -- *** Dave N7RK Boatanchors Home Page: http://members.cox.net/n7rk Phoenix, Arizona *DXCC Honor Roll**WAZ#22 - 75 Meter SSB* ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX Boatanchor and Antique Radio Collector
Re: [AMRadio] Polycom 62 was Dayton Stuff
Hello Bob: Thanks for the reply. No, never owned the Polycom. Thats partly why I would like to try one. My first 2 meter rig was a hombrew superregen/modulated oscillator. Never worked anyone but did get some airplane traffic. I quickly graduated to military surplus like the SCR-522, ARC-3, ARC-5 etc. Still have/use some of that (started in 55). Well I dont know what the 4X4's or whatever means ?? Send your offer (if you do) direct to my e-mail address. I dont mind letting the guys here follow along but you might. 73 DE Charlie, K0NG ..
Re: [AMRadio] Polycom 62 was Dayton Stuff
Hello Pete: Well, Dayton can be expensive at the outset but cheep on Sunday afternoon. Feel free to E-Mail me (and I assume Bob) I wont be offended in any case, I am not out of projects, HI. [EMAIL PROTECTED] 73
