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
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
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
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!
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
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
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,
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.
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
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
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
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,
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
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
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
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