How about an Alpha 87A $2400
________________________________
From: Amps <amps-bounces@contesting.com> on behalf of Ron Ellis
<KH6DV@hawaiiantel.net>
Sent: Tuesday, March 23, 2021 6:21:14 PM
To: amps@contesting.com <amps@contesting.com>
Subject: [Amps] Wanted
Does anyone on the list have a good used AL-82, 1200 or 1500 amp they are
Willing to sell. These things are getting hard to find. Prefer the 82 as I love
The glow of fire bottles but would consider any AL-1200 or 1500 if not too
Expensive.
Thanks
Ron KH6DV
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From: amps-request@contesting.com
Sent: Tuesday, March 23, 2021 6:00 AM
To: amps@contesting.com
Subject: Amps Digest, Vol 219, Issue 11
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Today's Topics:
1. Re: QRO HF2000 tank coil Q question (gudguyham)
2. Re: QRO HF2000 tank coil Q question (John Keating)
----------------------------------------------------------------------
Message: 1
Date: Tue, 23 Mar 2021 01:24:38 +0000 (UTC)
From: gudguyham <gudguyham@aol.com>
To: John Keating <john.keating@outlook.com>, Peter Voelpel
<dj7ww@t-online.de>, "Amps@contesting.com" <Amps@contesting.com>
Subject: Re: [Amps] QRO HF2000 tank coil Q question
Message-ID: <2105074950.2623203.1616462678906@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
Have you guys taken into consideration that the tank circuit in these amps only
transform down to 200 ohms, not 50 ohms from the plate impedance? ?After the
tank circuit it passes through a 4 to 1 balun which brings it down to 50 ohms.
Sent from the all new AOL app for iOS
On Monday, March 22, 2021, 2:05 PM, John Keating <john.keating@outlook.com>
wrote:
Thanks Peter. I calculate a Q of 7 to 8 for the stock design mentioned in the
previous email.
There are still a fair number of these amps in use, I wondered if others had
similar experience.
I considered redesigning for higher Q but the modifications to the entire tank
circuit would be extensive. Again, I wondered if anyone had done such a thing.
73, John
-----Original Message-----
From: Peter Voelpel [mailto:dj7ww@t-online.de]
Sent: Monday, March 22, 2021 10:52 AM
To: 'John Keating'; Amps@contesting.com
Subject: RE: [Amps] QRO HF2000 tank coil Q question
I used stacks of T225-2 for a mobile antenna loading coil on 40m.
Measured Q was around 400.
Toroid coils with taps, which no good idea anyway, will have much lower Q.
As part of a pi network for 160m in the 2KW out class only T400 was not
getting too hot, stacks of T300 still overheated in RTTY.
73
Peter
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of John Keating
Sent: Montag, 22. M?rz 2021 17:23
To: Amps@contesting.com
Subject: [Amps] QRO HF2000 tank coil Q question
Wondering if anyone can provide the specs on the low band tank coil for a
QRO HF2000.
It appears to be a stack of two red-mix T225A-2 iron powder toroids, with a
total of 25 turns, and taps for 40M at the 7th turn, and for 80M at the 13th
turn.
Also wondering if anyone else notices how hot it gets on 160m.
73, John
AI6LY
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------------------------------
Message: 2
Date: Tue, 23 Mar 2021 01:28:30 +0000
From: John Keating <john.keating@outlook.com>
To: gudguyham <gudguyham@aol.com>, Peter Voelpel <dj7ww@t-online.de>,
"Amps@contesting.com" <Amps@contesting.com>
Subject: Re: [Amps] QRO HF2000 tank coil Q question
Message-ID:
<BYAPR04MB39278776F13EA293352AC6488A649@BYAPR04MB3927.namprd04.prod.outlook.com>
Content-Type: text/plain; charset="utf-8"
yes I took that into consideration for the calculations.
From: gudguyham [mailto:gudguyham@aol.com]
Sent: Monday, March 22, 2021 18:25 PM
To: John Keating; Peter Voelpel; Amps@contesting.com
Subject: Re: [Amps] QRO HF2000 tank coil Q question
Have you guys taken into consideration that the tank circuit in these amps only
transform down to 200 ohms, not 50 ohms from the plate impedance? After the
tank circuit it passes through a 4 to 1 balun which brings it down to 50 ohms.
Sent from the all new AOL app for
iOS<https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661>
On Monday, March 22, 2021, 2:05 PM, John Keating <john.keating@outlook.com>
wrote:
Thanks Peter. I calculate a Q of 7 to 8 for the stock design mentioned in the
previous email.
There are still a fair number of these amps in use, I wondered if others had
similar experience.
I considered redesigning for higher Q but the modifications to the entire tank
circuit would be extensive. Again, I wondered if anyone had done such a thing.
73, John
-----Original Message-----
From: Peter Voelpel [mailto:dj7ww@t-online.de<mailto:dj7ww@t-online.de>]
Sent: Monday, March 22, 2021 10:52 AM
To: 'John Keating'; Amps@contesting.com<mailto:Amps@contesting.com>
Subject: RE: [Amps] QRO HF2000 tank coil Q question
I used stacks of T225-2 for a mobile antenna loading coil on 40m.
Measured Q was around 400.
Toroid coils with taps, which no good idea anyway, will have much lower Q.
As part of a pi network for 160m in the 2KW out class only T400 was not
getting too hot, stacks of T300 still overheated in RTTY.
73
Peter
-----Original Message-----
From: Amps
[mailto:amps-bounces@contesting.com<mailto:amps-bounces@contesting.com>] On
Behalf Of John Keating
Sent: Montag, 22. M?rz 2021 17:23
To: Amps@contesting.com<mailto:Amps@contesting.com>
Subject: [Amps] QRO HF2000 tank coil Q question
Wondering if anyone can provide the specs on the low band tank coil for a
QRO HF2000.
It appears to be a stack of two red-mix T225A-2 iron powder toroids, with a
total of 25 turns, and taps for 40M at the 7th turn, and for 80M at the 13th
turn.
Also wondering if anyone else notices how hot it gets on 160m.
73, John
AI6LY
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Amps@contesting.com<mailto:Amps@contesting.com>
http://lists.contesting.com/mailman/listinfo/amps
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------------------------------
Subject: Digest Footer
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------------------------------
End of Amps Digest, Vol 219, Issue 11
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