[Drakelist] TR7 with Modern Linear

2009-03-01 Thread John Stringer
I am using my TR7 with a modern linear and have come up with what can best be described as an irritation rather than a problem. The linear requires only 20watts drive for 400 watts out (our limit). In SSB the only output control on the TR7 is the Mic Gain.It is a real fiddle to adjust this for 20

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Jim Shorney
On Sun, 1 Mar 2009 09:26:20 -, John Stringer wrote: The linear requires only 20watts drive for 400 watts out (our limit). In SSB the only output control on the TR7 is the Mic Gain.It is a real fiddle to adjust this for 20 watts and more so to keep it there. The smallest touch on the gain

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Garey Barrell
Jim - Some good points there. However, most are related to the dynamic action of ALC, NOT a fixed gain adjustment as I described. I and others have used this technique with success for a long time, but there is always new information! Of course there's always the argument that says all

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Jim Shorney
On Sun, 01 Mar 2009 13:12:04 -0500, Garey Barrell wrote: Some good points there. However, most are related to the dynamic action of ALC, NOT a fixed gain adjustment as I described. I and others have used this technique with success for a long time, but there is always new information!

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Don Cunningham
Garey, et al, I tried the fake ALC method with my old KWM-380 and an Alpha 91b after fiddling with ALC on the 91b with little success. I had no more success with the fake ALC circuit I found on a site. While it DID work at lowering the output (that could be witnessed in the CW mode with

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Garey Barrell
Don - Dunno, never tried it on a TR-7. Doesn't seem like there should be a problem, since the fake ALC voltage is present before the transceiver is keyed. There was a blurb about a keying spike when the TR-7 was first powered on in the early units, but I didn't think it applied to CW or

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Don Cunningham
Thanks for the thoughts, Garey. The amps I have now all have ALC outputs, so I'll report back later if they have any problem with the TR7 if there is any interest. 73, Don, WB5HAK - Original Message - From: Garey Barrell k4...@mindspring.com To: drakelist@zerobeat.net Sent: Sunday,

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread John Stringer
11 posts in less than 12 hours in answer to my question-that is very impressive support from this group! Thank you all. I will try the fake ALC first as that is the easiest and come back to report. My Linear is the ACOM 1000 which I believe is similar to the Alpha 91. It has no ALC connection.

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Jim Shorney
On Sun, 01 Mar 2009 14:35:30 -0500, Garey Barrell wrote: There was a blurb about a keying spike when the TR-7 was first powered on in the early units, but I didn't think it applied to CW or SSB operation. The power on spike, I think, was related to the VOX circuit. It is fixable with a mod

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Jim Shorney
On Sun, 1 Mar 2009 21:22:12 -, John Stringer wrote: My Linear is the ACOM 1000 which I believe is similar to the Alpha 91. It has no ALC connection. In looking at the A1000 manual online, it is a grid driven tetrode with a swamping resistor in the grid circuit. Which sounds very similar to

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Joe Pyles
I run a TR7A into an Ameritron ALS-600 amp and on more than on occasion I have wiped out the FETs because of the leading edge spike. I have the alc set to 120 watts on 20 meters and on 75 meters it still only puts out 120 watts constant carrier. But on ssb with a peak reading wattmeter such as

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Don Cunningham
Jim, Remember one thing, John is in the UK and is limited to 400w out, not full power for the Acom!! Makes a difference, hi. 73, and thanks for your input too, Don, WB5HAK - Original Message - From: Jim Shorney jshor...@inebraska.com To: drakelist@zerobeat.net Sent: Sunday, March 01,

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Jim Shorney
On Sun, 1 Mar 2009 17:18:56 -0600, Don Cunningham wrote: Remember one thing, John is in the UK and is limited to 400w out, not full power for the Acom! Yeah, I sort of gathered that is why he was wanting to reduce his drive power to 20 watts. The 6dB attenuator for tune mode of the amplifier

Re: [Drakelist] TR7 with Modern Linear

2009-03-01 Thread Drakedude
I run my TR7 with a QRO Technologies HF2500 (pr of GU74b's) with the ALC connected and have no problem. I also have the ALC on the TR7 cranked back somewhat. Paul AD3G -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Don

[Drakelist] WTB: AC-4

2009-03-01 Thread Bob Fish
Hi Guys, I am looking for an AC-4. If any one has one they want to sell, contact me off list. Thanks, Bob K6GGO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist