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21. Re: [TenTec] re Ten Tec amps and ALC (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 18 Aug 2004 18:31:32 -0700
Check out: http://www.w8ji.com/transmitter_splatter.htm Scroll down to the paragraph entitled "ALC" Mike, W4EF................................................ to enough ______________________________
/archives//html/TenTec/2004-08/msg00850.html (9,249 bytes)

22. Re: [TenTec] Resonant antennas (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 4 Sep 2004 23:56:56 -0700
MHz. equation (and a mismatch. The circuitry Hi Jim, What you say is true, but take a look at the VSWR of a typical non-resonant antenna and you will see that VSWRs can be significantly higher than 4
/archives//html/TenTec/2004-09/msg00110.html (12,392 bytes)

23. Re: [TenTec] RF (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 10 Sep 2004 22:02:22 -0700
George, What is your antenna, and how are you bringing the feedline into the shack? Also, is the RF causing the computer to act up, or is the problem just with the keying interface? One way to tell i
/archives//html/TenTec/2004-09/msg00336.html (9,495 bytes)

24. Re: [TenTec] Paragon behavior (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 26 Sep 2004 21:13:36 -0700
Check the supply voltage under load, Tim. I had a problem with mine caused by a bad external fuseholder (high resistance) between the rig and the external power supply I was using. The rig was fine o
/archives//html/TenTec/2004-09/msg00723.html (9,119 bytes)

25. Re: [TenTec] Hi power Ten Tec ant tuner swr drift? (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Nov 2004 09:45:01 -0800
Are you using the ferrite balun? If so, check its temperature too. The stock balun in the this tuner is very unforgiving. When I built this tuner back in 1985, I smoked the balun almost immediately w
/archives//html/TenTec/2004-11/msg00303.html (8,425 bytes)

26. Re: [TenTec] Hi power Ten Tec ant tuner swr drift? (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Nov 2004 10:42:36 -0800
Good advice, Steve. Some form of capacitive top loading (top hat or even a single horizontal wire) will raise the feedpoint R too. Mike, W4EF.......................... percentage 4:1 anyway). get occ
/archives//html/TenTec/2004-11/msg00307.html (9,969 bytes)

27. Re: [TenTec] Re: FULL QSK? What it is (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Nov 2004 15:31:34 -0800
At infinite speed you can send your message in zero time, so at that point you don't really need QSK anymore :):) 73 de Mike, W4EF............................ between dits at infinite speed, and that
/archives//html/TenTec/2004-11/msg00330.html (8,027 bytes)

28. Re: [TenTec] Hi power Ten Tec ant tuner swr drift? (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Nov 2004 19:57:06 -0800
Doug, W9CF has an interesting java applet that calculates T-network tuner losses for an arbitary load impedance. You can adjust the component Q in the program setup and then examine what effect that
/archives//html/TenTec/2004-11/msg00342.html (13,363 bytes)

29. Re: [TenTec] Acom/Orion (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 31 Dec 2004 18:13:39 -0800
It might be the extra group delay from the filter, Barry. You might try substituting a long piece of coax for the Dunestar filter. A generic 5 pole high-pass with a 1.7 MHz cutoff will have about 100
/archives//html/TenTec/2004-12/msg01357.html (9,563 bytes)

30. [TenTec] Ruggedized 229 Tuner (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 14 Mar 2005 21:03:01 -0800
Ever since I built my Ten-Tec 4229 tuner kit (and subsequently fried the balun and ceramic wafer switch), I have always wanted to build a ruggedized version of this tuner. I think the 229/4229 uses a
/archives//html/TenTec/2005-03/msg00366.html (6,925 bytes)

31. Re: [TenTec] Wanted Heath HD-1481 Antenna Switch (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 20 Apr 2005 19:47:51 -0700
Jim, A local club station that I operate from uses three of Ameritron's RCS-4 remote coax switches to do what you are describing. We are feeding each of them through over 1100 ft of 7/8 hardline (we
/archives//html/TenTec/2005-04/msg00521.html (9,244 bytes)

32. Re: [TenTec] Filters, amps and IMD, etc (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 29 Jul 2005 07:34:26 -0700
That isn't quite right, Mike. This only happens when you put the attenuator in front of a non-linear amplifier. In this case, the attenuator will appear to reduce IMD products more than the fundament
/archives//html/TenTec/2005-07/msg01234.html (10,268 bytes)

33. Re: [TenTec] Filters, amps and IMD, etc (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 29 Jul 2005 23:07:44 -0700
Perhaps it is just the way you worded your statement, Mike, but I took what you said to mean that an attenuator actually reduces IMD regardless of where it is in the RF chain. An attenuator can't red
/archives//html/TenTec/2005-07/msg01247.html (15,880 bytes)

34. Re: [TenTec] Astron RS-35M and Omni VI (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 30 Jul 2005 10:50:20 -0700
I have seen some linear regulators that specify a small minimum load for stable operation. Usually these are low drop-out types, however. I have an RS-35 here, but I have never noticed any problems l
/archives//html/TenTec/2005-07/msg01255.html (8,127 bytes)

35. Re: [TenTec] Filters, amps and IMD, etc (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 30 Jul 2005 16:32:53 -0700
Well frankly, Mike, it irks me a little that you made my private email public, but fair enough (I never told you not to). Please see my comments below: Let me try to explain again, Mike. In statemen
/archives//html/TenTec/2005-07/msg01259.html (29,039 bytes)

36. Re: [TenTec] amps (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 6 Aug 2005 12:58:57 -0700
If you don't want to solder anything, here is an alternative to the Harbach kit: http://www.ameritron.com/products.php?prodid=ARB-704 Mike, W4EF........................... ___________________________
/archives//html/TenTec/2005-08/msg00123.html (8,116 bytes)

37. [TenTec] Minimum Supply Voltage for Omni 6+ (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 6 Aug 2005 15:56:46 -0700
I just received an Omni 6+ that I bought on Ebay. It appears to be working nominally, but the microprocessor flakes out if I drop the input voltage below +13 VDC (measured at the power input connecto
/archives//html/TenTec/2005-08/msg00130.html (7,670 bytes)

38. [TenTec] Centurion Plate Current Meter (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 11 Aug 2005 07:16:51 -0700
I am checking out a Ten-Tec Centurion 422 (2 x 3-500z) amplifier for a friend. This morning I fired it up on 20 meters (into a dummy load) for this first time. Everything looked good (output power, t
/archives//html/TenTec/2005-08/msg00216.html (8,117 bytes)

39. [TenTec] Omni VI+ Keying (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 12 Aug 2005 19:52:17 -0700
I just did an interesting experiment comparing my Paragon 585 (aka "Paragon 1") to an Omni 6+ that I just picked up on Ebay. When I connect my Inrad Key Pulser ( http://www.qth.com/inrad/) to the Par
/archives//html/TenTec/2005-08/msg00243.html (7,624 bytes)

40. Re: [TenTec] Omni VI+ Keying (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 12 Aug 2005 23:54:47 -0700
The TUNE button is easier on the operator, but can be harder on the PA if it isn't designed for RTTY service. It also keeps my cantenna dummy load from overheating when testing amplifiers as was the
/archives//html/TenTec/2005-08/msg00246.html (10,408 bytes)

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