- 41. [Amps] disconnects (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Tue, 21 Mar 2017 12:45:36 -0400
- Your membership in the mailing list TowerTalk has been disabled due to excessive bounces. The last bounce received from you was dated 19-Mar-2017. You will not get any more messages from this list un
- /archives//html/Amps/2017-03/msg00134.html (6,936 bytes)
- 42. Re: [Amps] New Amplifier (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Mon, 10 Apr 2017 11:39:13 -0400
- Wow! How times change. I remember when I thought a CK-722 was wonderful! 73, Roger REPLY: 4. A 1500 watt transistor is cheaper than a 1500 watt tube. _______________________________________________ _
- /archives//html/Amps/2017-04/msg00051.html (9,462 bytes)
- 43. [Amps] 1.3K-FA (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 05 May 2017 12:19:12 -0400
- Does anyone have info on the pad at the input required to meet FCC 15db gain rule? 73, Roger N1RJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
- /archives//html/Amps/2017-05/msg00063.html (6,737 bytes)
- 44. Re: [Amps] 1.3K-FA (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 05 May 2017 18:18:30 -0400
- Please read the question!!!!! I'm looking for info on the PAD not the regulations that require the pad! 73, Roger On 5/5/2017 5:52 PM, Glen Zook wrote: The rule is only for commercially manufactured
- /archives//html/Amps/2017-05/msg00078.html (8,701 bytes)
- 45. Re: [Amps] HV MOSFETs for RF (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 12 May 2017 12:01:27 -0400
- My new 1.3K-FA uses a MRF1K50H output LDMOS transistor. Does anyone know how long it would take to destroy the gate junction under overdrive conditions. Is there any system fast enough to prevent des
- /archives//html/Amps/2017-05/msg00118.html (8,019 bytes)
- 46. [Amps] pads on the input of LDMOS amplifiers (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Tue, 16 May 2017 07:54:16 -0400
- Does the input Z of one of these amps vary with drive level? I know it does with frequency. 73, Roger N1RJ _______________________________________________ Amps mailing list Amps@contesting.com http:/
- /archives//html/Amps/2017-05/msg00147.html (6,616 bytes)
- 47. Re: [Amps] Real time tests to see if an RF transformer is saturating? (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Tue, 16 May 2017 11:43:20 -0400
- If you can find it, you're better off using Litz wire. 73, Roger Hello Manfred and Alan, I stacked 3 off 78 material cores in the same size as the 77 material toroids and wound them with 180 strand s
- /archives//html/Amps/2017-05/msg00150.html (12,657 bytes)
- 48. [Amps] SPE 1.3K-FA for sale (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 15 Sep 2017 12:47:34 -0400
- I'm considering selling my US version 1.3K-FA. Purchased new in April of this year. Just used to make a few 6m contacts. It has the newer MRF1H50H final transistor. No internal tuner as I have a Step
- /archives//html/Amps/2017-09/msg00058.html (6,432 bytes)
- 49. Re: [Amps] Ham Radio Magazine article six 572Bs on 160 meters (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Sun, 13 Jan 2019 15:43:22 -0500
- I looked also and found nothing. Sounds more like a 73 article. I also looked at entire 3 Magazine. Same result. Somewhere in that lot, I found a 6 x sweep tube multuband amp but nothing with 572Bs.
- /archives//html/Amps/2019-01/msg00058.html (10,789 bytes)
- 50. Re: [Amps] Ham Radio Magazine article six 572Bs on 160 meters (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 15 Mar 2019 10:12:48 -0400
- I couldn't find it either. On 1/10/2019 6:12 AM, Lane Zeitler via Amps wrote: There was an article in Ham Radio Magazine from the late 1970s, early 80s. The builder had six 572Bs in parallel on 160 m
- /archives//html/Amps/2019-03/msg00019.html (7,315 bytes)
- 51. Re: [Amps] Cathode Choke (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Sat, 5 Oct 2019 09:53:49 -0400
- I may be wrong but the old memory banks came up with two possible reasons for the choke: 1. To prevent heater to cathode voltage breakdown 2. To prevent the heater to cathode capacitance from shuntin
- /archives//html/Amps/2019-10/msg00009.html (9,059 bytes)
- 52. Re: [Amps] Tips For Winding a Plate Choke (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Thu, 10 Oct 2019 11:38:25 -0400
- A simpler alternative is to switch another choke in series for the lower frequencies. This is quite simple to do. Think of two chokes in series with a capacitor connected to the junction of the choke
- /archives//html/Amps/2019-10/msg00043.html (9,236 bytes)
- 53. Re: [Amps] What limits DC plate supply voltage for GI7B? (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 25 Oct 2019 11:56:41 -0400
- From EIMAC: Positive ions are formed through ionization of residual gasses. High anode voltages speed formation of positive ions. The space charge (electron cloud) surrounding the cathode repels posi
- /archives//html/Amps/2019-10/msg00072.html (10,512 bytes)
- 54. Re: [Amps] LA100 tuner for input to amp (Not LP100) (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 20 Mar 2020 07:30:04 -0400
- The Q of an L network wasn't sufficient for a solid state exciter driving a GG tube amplifier. 73, Roger A modified LA-100Pro It's not possible from the article to determine who the author is. Who wr
- /archives//html/Amps/2020-03/msg00088.html (8,417 bytes)
- 55. Re: [Amps] Amps Digest, Vol 208, Issue 9 (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 24 Apr 2020 11:25:09 -0400
- The original purpose of this relay was to switch the input/output from 52 Ohms when transmitting to 200-300 Ohms on receive to better match the input impedance of the receivers of the day. With moder
- /archives//html/Amps/2020-04/msg00020.html (7,445 bytes)
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