[Boatanchors] Boatanchors Digest, Vol 80, Issue 35
Henry Mei'l's
meils at get2net.dk
Wed Sep 15 13:13:54 EDT 2010
Sandy,
I have descriptions of HB tuned speakers.
Will post the referece on this reflector later.
73 Henry, OZ1uF Cph (exK2UOC Bklyn)
----- Original Message -----
From: <boatanchors-request at mailman.qth.net>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, September 15, 2010 6:00 PM
Subject: Boatanchors Digest, Vol 80, Issue 35
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> Today's Topics:
>
> 1. FS: *NEW* Unique Drake Service Supplement CD (Garey Barrell)
> 2. Info on acoustically tuned loudspeakers? (Sandy)
> 3. Wanted: 400 pf Air Variable Cap (Howard)
> 4. Re: [Glowbugs] Info on acoustically tuned loudspeakers?
> (Jim Larsen - AL7FS)
> 5. Re: [Glowbugs] Info on acoustically tuned loudspeakers?
> Resonant Speaker (Jim Larsen - AL7FS)
> 6. Heathkit Q-Multiplier With Drake 2-B Receiver (Michael D. Harmon)
> 7. Transmitter comparisons and a question. (Curt)
> 8. Re: Heathkit Q-Multiplier With Drake 2-B Receiver (Greg Mijal)
> 9. Re: Transmitter comparisons and a question. (Carl)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 14 Sep 2010 17:37:23 -0400
> From: Garey Barrell <k4oah at mindspring.com>
> Subject: [Boatanchors] FS: *NEW* Unique Drake Service Supplement CD
> To: Boatanchors at mailman.qth.net
> Message-ID: <4C8FEB13.5080401 at mindspring.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I've had several inquiries regarding a CD for the 2-C / 2-NT pair. The CD
> is now available for $25
> to US addresses!
>
> Here is the information that Drake left out of their manuals!
>
> Unique supplemental service information CD available for the Drake 2-C and
> 2-NT
>
> High resolution color photos of the under chassis and individual PC boards
> of each unit, with all
> parts identified and keyed to a parts list make it easy to locate any
> component. No more trying to
> trace wires through bundles, etc. This information is not available
> elsewhere and really makes a
> difference in servicing these units.
>
> These CDs are NOT just scans of the original manuals that were included
> with the equipment when new.
> High resolution scans of the original manuals ARE on the CDs.
>
> Of course the rest of the CDs are still available, the 2-B, B-Line,
> C-Line, TR-4 and TR-4C/Cw/CwRIT.
> Samples of these pages (at reduced resolution) and purchase information
> are at <www.k4oah.com>.
>
> --
> 73, Garey - K4OAH
> Glen Allen, VA
>
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 14 Sep 2010 17:25:22 -0500
> From: "Sandy" <ebjr37 at charter.net>
> Subject: [Boatanchors] Info on acoustically tuned loudspeakers?
> To: <tetrode at googlegroups.com>, <boatanchors at mailman.qth.net>
> Message-ID: <485EB06109A84FBCA660571E19618679 at gateway>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Anybody got any data on calculating dimensions of tuned speaker tubes? I
> 'hade" some data somewhere, but lost it.....dammit.
>
> Need to take a small round speaker and build a CW "filter" for around 700
> Hz
> or so. Last one I built was 10 years ago and it worked really well
> without
> a lot of "ring".
>
> 73,
>
> Sandy W5TVW
>
> PS: Have a used but excellent FT-990 that was given to me and it works
> super although it is kinda big for the small desk in my bedroom! Been
> hanging around 7050 afternoons and sometimes on 3546.5 or so early
> evenings.
> (01-03Z about)
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 14 Sep 2010 18:53:45 -0400
> From: Howard <wa2afd at gmail.com>
> Subject: [Boatanchors] Wanted: 400 pf Air Variable Cap
> To: boatanchors at mailman.qth.net
> Message-ID:
> <AANLkTim3Ge+XhTx2+mqqxRpfkMPWmeZrXP3bkHpEXms4 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hello to all. I am looking to buy an air variable cap roughly 20-400 pf to
> complete a homebrew antenna tuner. Must have spacing wide enough to pass
> along 100 watts.
>
> Thanks in advance.
>
> 73 de W2AFD Howard
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 14 Sep 2010 18:13:31 -0800
> From: Jim Larsen - AL7FS <jimlarsen2002 at alaska.net>
> Subject: Re: [Boatanchors] [Glowbugs] Info on acoustically tuned
> loudspeakers?
> To: tetrode at googlegroups.com, boatanchors at mailman.qth.net
> Message-ID: <4C902BCB.7080700 at alaska.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> http://www.io.com/~n5fc/res_spkr.htm
>
> Here is one source of info.
>
> Jim Larsen, AL7FS
> Anchorage Alaska
> 907-345-3190
> http://www.AL7FS.us/
>
>
> On 9/14/2010 2:25 PM, Sandy wrote:
>> Anybody got any data on calculating dimensions of tuned speaker tubes?
>> I 'hade" some data somewhere, but lost it.....dammit.
>
>> Sandy W5TVW
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 14 Sep 2010 18:22:47 -0800
> From: Jim Larsen - AL7FS <jimlarsen2002 at alaska.net>
> Subject: Re: [Boatanchors] [Glowbugs] Info on acoustically tuned
> loudspeakers? Resonant Speaker
> To: tetrode at googlegroups.com, boatanchors at mailman.qth.net
> Message-ID: <4C902DF7.3000202 at alaska.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> http://kd1jv.qrpradio.com/resonatespkr/CWSPKR.HTM
>
> Jim Larsen, AL7FS
> Anchorage Alaska
> 907-345-3190
> http://www.AL7FS.us/
>
>
> On 9/14/2010 2:25 PM, Sandy wrote:
>> Anybody got any data on calculating dimensions of tuned speaker tubes?
>> I 'hade" some data somewhere, but lost it.....dammit.
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 14 Sep 2010 22:25:23 -0500
> From: "Michael D. Harmon" <mharmon at att.net>
> Subject: [Boatanchors] Heathkit Q-Multiplier With Drake 2-B Receiver
> To: Boatanchors Mailing List <boatanchors at mailman.qth.net>
> Message-ID: <4C903CA3.7020708 at att.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I've recently come into possession of a nice Drake 2-B receiver. It
> came with no accessories, and I'd like to find a Q-multiplier for it.
> Unfortunately, the Drake 2-BQ units seem to be made of gold these days.
> The ones I've seen on E-Pay are bringing $150 or more (more than I paid
> for the receiver!).
>
> Over the years, Heathkit produced a Q-multiplier kit under at least 3
> model numbers (GD-125, HD-11, QF-1). All were fundamentally the same
> design, but with different packaging. They show up from time to time on
> E-Pay at very reasonable prices (at least compared to the Drake unit).
> I'd like to know how these Heath units compare to the Drake 2-BQ. It
> would seem that a Q-multiplier designed for a 455 kHz IF frequency
> should be effective if connected into the circuit at the 455 kHz IF
> point (between the 2nd and 3rd mixers in the 2-B), but there may be
> other issues I'm not considering. Anyone ever used a Heathkit
> Q-multiplier with a Drake 2-B? Good idea? Bad idea?
>
> I'd appreciate any comments or suggestions any of you might have.
>
> Thanks,
> Mike Harmon, WB0LDJ
> mharmon at att dot net
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 15 Sep 2010 07:24:49 -0500
> From: "Curt" <rhulett1 at comcast.net>
> Subject: [Boatanchors] Transmitter comparisons and a question.
> To: <boatanchors at mailman.qth.net>
> Message-ID: <7A8A9E70EEC14A88A154F2F01EA51D7E at curte7d33a8d83>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Well, had first QSO yesterday with new to me DX-20 on 40M. As expected,
> it
> performs about the same as the Eico 723, the two seem nearly identical in
> design and implementation. I've read that the Eico's transformer may be a
> little more rugged. Neither of them like HC49 crystals, which is what
> most
> of the available FT243s are. Both rigs chirp like a canary with the small
> HC49, but an HC6U or real FT243 produces a clean signal.
>
> The next candidate on the bench is a Globe Scout 680, which appears to be
> intact and in good cosmetic condition. Since it uses a 6V6 as the
> oscillator, I'm anticipating even more of a tendency to chirp.
>
> My question is whether there is a way to make the HC49 crystals useable in
> these oscillators? The seller indicated they work fine in any rig with
> less
> than 40ma crystal current, so obviously the DX-20 and Eico 723 have higher
> than that.
>
> 73, Curt KB5JO
>
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 15 Sep 2010 09:02:43 -0400
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> Subject: Re: [Boatanchors] Heathkit Q-Multiplier With Drake 2-B
> Receiver
> To: "Michael D. Harmon" <mharmon at att.net>, "Boatanchors Mailing List"
> <boatanchors at mailman.qth.net>
> Message-ID: <82568AD0E35E44919C7A429F695702B4 at GregMijalPC>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I ran a 2A and Heathkit QF-1 together for some time. Worked fine.
> 73's
> Greg
> WA7LYO
> Kinston NC
> ----- Original Message -----
> From: "Michael D. Harmon" <mharmon at att.net>
> To: "Boatanchors Mailing List" <boatanchors at mailman.qth.net>
> Sent: Tuesday, September 14, 2010 11:25 PM
> Subject: [Boatanchors] Heathkit Q-Multiplier With Drake 2-B Receiver
>
>
>> I've recently come into possession of a nice Drake 2-B receiver. It
>> came with no accessories, and I'd like to find a Q-multiplier for it.
>> Unfortunately, the Drake 2-BQ units seem to be made of gold these days.
>> The ones I've seen on E-Pay are bringing $150 or more (more than I paid
>> for the receiver!).
>>
>> Over the years, Heathkit produced a Q-multiplier kit under at least 3
>> model numbers (GD-125, HD-11, QF-1). All were fundamentally the same
>> design, but with different packaging. They show up from time to time on
>> E-Pay at very reasonable prices (at least compared to the Drake unit).
>> I'd like to know how these Heath units compare to the Drake 2-BQ. It
>> would seem that a Q-multiplier designed for a 455 kHz IF frequency
>> should be effective if connected into the circuit at the 455 kHz IF
>> point (between the 2nd and 3rd mixers in the 2-B), but there may be
>> other issues I'm not considering. Anyone ever used a Heathkit
>> Q-multiplier with a Drake 2-B? Good idea? Bad idea?
>>
>> I'd appreciate any comments or suggestions any of you might have.
>>
>> Thanks,
>> Mike Harmon, WB0LDJ
>> mharmon at att dot net
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
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>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
> ------------------------------
>
> Message: 9
> Date: Wed, 15 Sep 2010 09:32:06 -0400
> From: "Carl" <km1h at jeremy.mv.com>
> Subject: Re: [Boatanchors] Transmitter comparisons and a question.
> To: "Curt" <rhulett1 at comcast.net>, <boatanchors at mailman.qth.net>
> Message-ID: <005201cb54da$66691ec0$6501a8c0 at DAVES>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Id start by measuring the crystal current and then reducing the oscillator
> power down until the chirp stops. You may or may not have enough drive to
> the next stage. In that case build a SS oscillator inside the rig and
> use
> the tube oscillator as a buffer/amp.
>
> Or build a SS VFO and quit wasting money on crystals (-;
>
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "Curt" <rhulett1 at comcast.net>
> To: <boatanchors at mailman.qth.net>
> Sent: Wednesday, September 15, 2010 8:24 AM
> Subject: [Boatanchors] Transmitter comparisons and a question.
>
>
>> Well, had first QSO yesterday with new to me DX-20 on 40M. As expected,
>> it
>> performs about the same as the Eico 723, the two seem nearly identical in
>> design and implementation. I've read that the Eico's transformer may be
>> a
>> little more rugged. Neither of them like HC49 crystals, which is what
>> most
>> of the available FT243s are. Both rigs chirp like a canary with the
>> small
>> HC49, but an HC6U or real FT243 produces a clean signal.
>>
>> The next candidate on the bench is a Globe Scout 680, which appears to be
>> intact and in good cosmetic condition. Since it uses a 6V6 as the
>> oscillator, I'm anticipating even more of a tendency to chirp.
>>
>> My question is whether there is a way to make the HC49 crystals useable
>> in
>> these oscillators? The seller indicated they work fine in any rig with
>> less
>> than 40ma crystal current, so obviously the DX-20 and Eico 723 have
>> higher
>> than that.
>>
>> 73, Curt KB5JO
>>
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> ______________________________________________________________
> Boatanchors mailing list
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> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> End of Boatanchors Digest, Vol 80, Issue 35
> *******************************************
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