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Total 101 documents matching your query.

1. Re: [Amps] RE : DIN stands for....? (score: 1)
Author: "Joe Subich, W4TV" <W4TV@subich.com>
Date: Mon, 27 Feb 2006 11:27:10 -0500
The only 8-pin connector on the FT-1000 series radios is the band data and it's a DIN8/262. The other connectors are Packet => DIN 5, DVS2 => DIN7, RTTY => DIN4, CAT => DIN6 One reason Yaesu may have
/archives//html/Amps/2006-02/msg00615.html (10,541 bytes)

2. Re: [Amps] Pin Diodes (score: 1)
Author: "Joe Subich, W4TV" <W4TV@subich.com>
Date: Wed, 8 Mar 2006 11:55:02 -0500
Or one can simply use additional diodes in the receive path that are biased off during transmit and on during receive. The key is to use two or three stages and sufficient negative bias to keep them
/archives//html/Amps/2006-03/msg00205.html (8,849 bytes)

3. Re: [Amps] Pin Diodes (score: 1)
Author: "Joe Subich, W4TV" <W4TV@subich.com>
Date: Wed, 8 Mar 2006 12:05:55 -0500
John, I would be interested in the carrier lifetime measurements on the IN4007 when you get them (or if anyone else has similar numbers). The biggest problem John Sheller had with the QSK1500 in the
/archives//html/Amps/2006-03/msg00208.html (15,080 bytes)

4. Re: [Amps] More LK500 (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Mon, 29 May 2006 17:51:58 -0400
Jeff, Compare your step start (soft start) unit to the one by Harbach Electronics (www.harbachelectronics.com). Those instructions may help you get by (including the note that it is necessary to use
/archives//html/Amps/2006-05/msg00496.html (8,988 bytes)

5. Re: [Amps] LK500 various (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Tue, 30 May 2006 14:57:34 -0400
However, encouraging one to make modifications to the wiring in his home (owned or rented) that violates code and safety regulations is well outside the purpose of this group. Nobody in their right m
/archives//html/Amps/2006-05/msg00516.html (9,301 bytes)

6. Re: [Amps] la-1000 what to convert to? (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Tue, 6 Jun 2006 15:15:07 -0400
The Svetlana tube was the EL509 ... The old Svetlana web site used to have a technical bulletin covering the conversion. Will is correct ... Far Circuits still shows the PC Board set or the conversio
/archives//html/Amps/2006-06/msg00174.html (11,429 bytes)

7. Re: [Amps] la-1000 what to convert to? (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Tue, 6 Jun 2006 16:27:10 -0400
The Far Circuits board claims: This board has been designed to use the Svetlana tube sockets made for the EL-509/6KG6 tubes and provisions have been made for the installation of a cathode resistor fo
/archives//html/Amps/2006-06/msg00179.html (15,330 bytes)

8. Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Sat, 24 Jun 2006 09:19:58 -0400
The Eimac data sheet (Reference Data from the web) gives a 50 watt grid dissipation rating. I don't have the constant current curves to see what that works out to but the grid of a 3-500Z is rated fo
/archives//html/Amps/2006-06/msg00344.html (8,638 bytes)

9. Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Sat, 24 Jun 2006 13:18:52 -0400
That's fine but as I said: "I don't have the constant current curves" which means I do not have any way to determine the peak (or even average through the full RF cycle) cathode to grid voltage in th
/archives//html/Amps/2006-06/msg00350.html (9,437 bytes)

10. Re: [Amps] IM distortion and such (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Tue, 27 Jun 2006 12:39:22 -0400
No, Will should have said "for minimum distortion at 1 KW PEP input and class B service at 2500 Volts, the maximum plate current at single tone ..." There is no indication that 1KW PEP class B produc
/archives//html/Amps/2006-06/msg00514.html (11,211 bytes)

11. Re: [Amps] IM distortion and such (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Wed, 28 Jun 2006 11:02:36 -0400
This is a complete canard. Amplifiers do not operate along the constant current curves. They operate along a "load line" that starts at the zero drive condition for grid to cathode voltage and plate
/archives//html/Amps/2006-06/msg00568.html (11,809 bytes)

12. Re: [Amps] IM Distortion (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Wed, 28 Jun 2006 11:02:36 -0400
Ed, Probably not ... the filament and grid structure are not changed and they are the primary factors that effect peak current and transfer characteristics. The only way a change in Anode would effec
/archives//html/Amps/2006-06/msg00569.html (7,734 bytes)

13. Re: [Amps] IM distortion and such (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Wed, 28 Jun 2006 13:41:01 -0400
They will certainly arc if the operator is improperly loaded <G>. However if the amplifier is underloaded, voltage in the output "tank" will increase. The "limit" for underloading is operating into a
/archives//html/Amps/2006-06/msg00584.html (8,948 bytes)

14. Re: [Amps] IM distortion and such (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Wed, 28 Jun 2006 14:02:02 -0400
If that is true, it is impossible to design a "clean" amplifier around the 3-500Z. A simple examination of the constant current curves for grounded grid operation shows that the constant current line
/archives//html/Amps/2006-06/msg00593.html (11,837 bytes)

15. Re: [Amps] IM distortion and such (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Thu, 29 Jun 2006 23:35:53 -0400
Gary, you make the same mistake Rich does ... the voltage is not necessarily due to parasitic oscillation at VHF frequencies. An unloaded tank can generate voltages several times that of the applied
/archives//html/Amps/2006-06/msg00648.html (9,960 bytes)

16. Re: [Amps] 4CX10 000J (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Sun, 2 Jul 2006 10:44:13 -0400
What are the differences between the 4CX1000J and 4CX10000D - particularly to explain the 10 KW vs. 15 KW output difference in the "normal operation" figures on the Eimac short form catalog (www.cpii
/archives//html/Amps/2006-07/msg00050.html (7,657 bytes)

17. Re: [Amps] 4CX10 000J (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Sun, 2 Jul 2006 11:37:36 -0400
Thank you, Peter. Interesting ... the Eimac "short form' catalog shows the gain to be 4.5. 20 dB would, indeed, be worthwhile - particularly with an FT-1000D or Mark V available as a driver. Their "c
/archives//html/Amps/2006-07/msg00055.html (8,676 bytes)

18. Re: [Amps] again (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Mon, 3 Jul 2006 10:20:28 -0400
Although I have not done the mathematics, since power transfer occurs at less than 360 degrees when the amplifier is operated in other than class A service, why don't you try doing an integration of
/archives//html/Amps/2006-07/msg00099.html (8,896 bytes)

19. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Mon, 3 Jul 2006 11:02:22 -0400
Banning DSB full carrier AM sounds like a good idea to me. If someone wants "AM compatibility" ISB with reduced carrier will do the job just fine. There is no justification for a bandwidth greater th
/archives//html/Amps/2006-07/msg00102.html (9,661 bytes)

20. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1)
Author: "Joe Subich, W4TV" <w4tv@subich.com>
Date: Mon, 3 Jul 2006 12:23:33 -0400
Modern radios will only do 4K+ of SSB if you bypass the if filter which is generally 2.7 to 3.0 KHz wide at the - 6dB point or use outboard equalization techniques to "make up" for the losses on both
/archives//html/Amps/2006-07/msg00110.html (11,907 bytes)

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