[Amps] Amps Digest, Vol 138, Issue 23
David Lisney
g0fvt at hotmail.com
Wed Jun 25 16:41:36 EDT 2014
Hi, the power supply for the Quadra is a switch-mode, the manual seems to reckon 240v is ok.
In the UK our mains voltage is 240v, as far as I know Quadras survive that fine... I personally would run it straight off your mains supply... the buck transformer is a valid approach to sorting out the supply voltage issue... however it is vital that current is not allowed to pass through the low voltage secondary without the primary powered.
A 15v 10a transformer should do the job...
regards David G0FVT
Sent from my iPad
> On 25 Jun 2014, at 21:00, amps-request at contesting.com wrote:
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> Today's Topics:
>
> 1. Buck-Boost Transformer Selection (Richard Solomon)
> 2. Re: Buck-Boost Transformer Selection (Jim Garland)
> 3. Re: Buck-Boost Transformer Selection (Carl)
> 4. Re: Buck-Boost Transformer Selection (Bill Turner)
> 5. Whither all band sw bandpass filters (w5ov at w5ov.com)
> 6. Re: Buck-Boost Transformer Selection (Doug Ronald)
> 7. Re: Buck-Boost Transformer Selection (Bill Turner)
> 8. Re: Buck-Boost Transformer Selection (Glen Zook via Amps)
> 9. Re: Buck-Boost Transformer Selection (Joe Subich, W4TV)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 25 Jun 2014 10:05:30 -0700
> From: Richard Solomon <dickw1ksz at gmail.com>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: [Amps] Buck-Boost Transformer Selection
> Message-ID:
> <CAC5FBO8zG29wfD0QajtL89UMq=nvGBY_VVfcmesR-GTmu6zNjw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> I have a lead on a late production Quadra so I guess I better
> invest in a B-B Xfmr to get my sometimes 250 volt line down
> to something acceptable to my new little friend.
>
> Question is on the rating for the Xfmr ... I expect I should get
> something rated for the load, say 1.5 KVA (considering the
> rating is for CCS use not ICAS).
>
> Now I find lots of them over on the evil empire, but looking at
> the specs on the label is confusing:
>
> One I found says:
>
> Max Volts 264 Max Amps 62.5 1.5KVA
>
> The current rating does not make sense. How can I sort this out ??
>
> Thanks, Dick, W1KSZ
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 25 Jun 2014 11:17:56 -0600
> From: "Jim Garland" <4cx250b at miamioh.edu>
> To: "'Richard Solomon'" <dickw1ksz at gmail.com>, <amps at contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <00f901cf9099$689efe40$39dcfac0$@miamioh.edu>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Dick,
> You don't need a 1.5KV rating. Let's say you want to drop the line voltage
> by 12V and suppose the maximum current drawn from the AC line by the
> amplifier is 15 Amps. You'd thus need only a 12Vrms/15A transformer (180W).
> Because of the limited duty cycle of the Quadra, probably a 10-12A
> tranformer would work fine.
> 73,
> Jim W8ZR.
>
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Richard
> Solomon
>> Sent: Wednesday, June 25, 2014 11:06 AM
>> To: amps at contesting.com
>> Subject: [Amps] Buck-Boost Transformer Selection
>>
>> I have a lead on a late production Quadra so I guess I better
>> invest in a B-B Xfmr to get my sometimes 250 volt line down
>> to something acceptable to my new little friend.
>>
>> Question is on the rating for the Xfmr ... I expect I should get
>> something rated for the load, say 1.5 KVA (considering the
>> rating is for CCS use not ICAS).
>>
>> Now I find lots of them over on the evil empire, but looking at
>> the specs on the label is confusing:
>>
>> One I found says:
>>
>> Max Volts 264 Max Amps 62.5 1.5KVA
>>
>> The current rating does not make sense. How can I sort this out ??
>>
>> Thanks, Dick, W1KSZ
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 25 Jun 2014 13:35:14 -0400
> From: "Carl" <km1h at jeremy.mv.com>
> To: "Richard Solomon" <dickw1ksz at gmail.com>, <amps at contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <250702D59E5244AF863886F32DB7F11D at computer1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Move the decimal to the left.
>
>
> ----- Original Message -----
> From: "Richard Solomon" <dickw1ksz at gmail.com>
> To: <amps at contesting.com>
> Sent: Wednesday, June 25, 2014 1:05 PM
> Subject: [Amps] Buck-Boost Transformer Selection
>
>
>> I have a lead on a late production Quadra so I guess I better
>> invest in a B-B Xfmr to get my sometimes 250 volt line down
>> to something acceptable to my new little friend.
>>
>> Question is on the rating for the Xfmr ... I expect I should get
>> something rated for the load, say 1.5 KVA (considering the
>> rating is for CCS use not ICAS).
>>
>> Now I find lots of them over on the evil empire, but looking at
>> the specs on the label is confusing:
>>
>> One I found says:
>>
>> Max Volts 264 Max Amps 62.5 1.5KVA
>>
>> The current rating does not make sense. How can I sort this out ??
>>
>> Thanks, Dick, W1KSZ
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2014.0.4592 / Virus Database: 3986/7742 - Release Date: 06/25/14
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 25 Jun 2014 11:18:17 -0700
> From: Bill Turner <dezrat at outlook.com>
> To: amps at contesting.com
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <BLU436-SMTP855D3ED88FE81DD8B871F7C0190 at phx.gbl>
> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
>
> ORIGINAL MESSAGE: (may be snipped)
>
>> On 6/25/2014 10:05 AM, Richard Solomon wrote:
>> I have a lead on a late production Quadra so I guess I better
>> invest in a B-B Xfmr to get my sometimes 250 volt line down
>> to something acceptable to my new little friend.
>
> REPLY:
>
> This isn't what you asked, but you really need to get the power company
> to fix your over-voltage problem. Anything in your house that runs off
> of the 240 line is susceptible to damage. Fix that and you won't need a
> transformer.
>
> 73, Bill W6WRT
> dezrat at outlook.com
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 25 Jun 2014 13:51:49 -0500
> From: w5ov at w5ov.com
> To: amps at contesting.com
> Subject: [Amps] Whither all band sw bandpass filters
> Message-ID: <14be13f838932009c0812075677d6b1b.squirrel at www12.qth.com>
> Content-Type: text/plain;charset=iso-8859-1
>
> K4VUD said:
>
> "Array Solutions sells an aptly named AS-419 auto switching filter set for
> the SIX bands and a separate AS-419W for four bands, WARC and 60m. Nice
> Guy Jay at Array politely refused my request to him to create a unit for
> all TEN bands in one unit. Having two boxes makes switching and wiring a
> nightmare."
>
> Allow me to correct some misconceptions here.
>
> One misconception is that it would be economical to create a 9 or 10
> filter commercial product for just one customer. One might think that
> there'd be a huge market for such a consolidated product, but that is not
> the case. Most purchasers of bandpass filters do so strictly for contests.
> Therefore, they do not want WARC filters included. We offer the contest
> bands in the AS-419, and the WARC bands in the AS-419W.
>
> The second misconception is that having the two units in question creates
> a "wiring nightmare".
>
> Depending on the radio type you have, you may not even need a band decoder
> to fully automate the selection of all 10 filters in the AS-419
> (160,80,40,20,15 & 10m) and AS-419W (60,30,17,12m) combo.
>
> If you have a Yaesu transceiver or an Elecraft K3, this combination can be
> controlled directly from the Yaesu format band data from the radio. This
> can be routed to both units via an inexpensive DB-9 Y connector and one
> DIN to DB9 cable (or DB15HD to DB9 for the K3) . Hardly a nightmare.
>
> The units will enable the correct filter or go into bypass mode
> automatically with this method or using a band decoder. With the Array
> Solutions Bandmaster 4 band decoder, the connections from decoder to both
> bandpass filter units are handled using provided RJ-14 terminated
> "telephone" type cords. Again, no wiring nightmare.
>
> Details can be found here:
>
> http://www.arraysolutions.com/Hamation/bandpasser/bandpasser_II_AS_419.htm
>
> 73,
>
> Bob W5OV
> Array Solutions
>
>
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 25 Jun 2014 12:12:13 -0700
> From: "Doug Ronald" <doug at dougronald.com>
> To: <amps at contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <007f01cf90a9$60878280$21968780$@dougronald.com>
> Content-Type: text/plain; charset="us-ascii"
>
> The American National Standard for Electric Power Systems and Equipment
> allows the service range for nominal 240 VAC mains to be 228 - 252 VAC. The
> utilization range extends to 254.4 VAC.
>
> Find the reference document here:
> http://www.pge.com/includes/docs/pdfs/mybusiness/customerservice/energystatu
> s/powerquality/voltage_tolerance.pdf
>
> Doug Ronald
> AE6SY
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Bill Turner
> Sent: Wednesday, June 25, 2014 11:18 AM
> To: amps at contesting.com
> Subject: Re: [Amps] Buck-Boost Transformer Selection
>
> ORIGINAL MESSAGE: (may be snipped)
>
>> On 6/25/2014 10:05 AM, Richard Solomon wrote:
>> I have a lead on a late production Quadra so I guess I better invest
>> in a B-B Xfmr to get my sometimes 250 volt line down to something
>> acceptable to my new little friend.
>
> REPLY:
>
> This isn't what you asked, but you really need to get the power company to
> fix your over-voltage problem. Anything in your house that runs off of the
> 240 line is susceptible to damage. Fix that and you won't need a
> transformer.
>
> 73, Bill W6WRT
> dezrat at outlook.com
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 25 Jun 2014 12:25:28 -0700
> From: Bill Turner <dezrat at outlook.com>
> To: Adrian Flynn <adrianjamesflynn at gmail.com>, Amps
> <amps at contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <BLU436-SMTP474EC472826A73526FDE3BC0190 at phx.gbl>
> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
>
> ORIGINAL MESSAGE: (may be snipped)
>
>> On 6/25/2014 12:18 PM, Adrian Flynn wrote:
>> If you monitor the line voltage closely you will find that the "Power
>> Companies" are slowly raising the *Normal Line Voltage* to /*125 volts
>> per leg and 250 volts* *for both legs!*/
>
> REPLY:
>
> Nevertheless, I would ask the power company to fix it. If they refuse,
> then go from there.
>
> 73, Bill W6WRT
> dezrat at outlook.com
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 25 Jun 2014 12:42:54 -0700
> From: Glen Zook via Amps <amps at contesting.com>
> To: Bill Turner <dezrat at outlook.com>, Adrian Flynn
> <adrianjamesflynn at gmail.com>, Amps <amps at contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID:
> <1403725374.86915.YahooMailNeo at web142301.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> The power company is not very likely to reduce the voltage! ?Especially with the load placed on the distribution systems during the summer months, the company is going to run higher voltage and that means about 127 / 254 VAC. ?In this area, Dallas, Texas, area, the line voltage has generally been very near the 127 / 254 VAC levels since the late 1960s during the warmer months. ?I don't know about prior to 1967 since I didn't live in the area until April 1967.
>
> The "target" voltage is 125 VAC +/- 2-volts / 250 VAC +/- 4-volts and virtually every electric company runs on the "+" side during the warmer months.
> ?
> Glen, K9STH
>
>
> Website: http://k9sth.com
>
>
> On Wednesday, June 25, 2014 2:25 PM, Bill Turner <dezrat at outlook.com> wrote:
>
>
>
> ORIGINAL MESSAGE:? ? ? ? ? (may be snipped)
>
>> On 6/25/2014 12:18 PM, Adrian Flynn wrote:
>> If you monitor the line voltage closely you will find that the "Power
>> Companies" are slowly raising the *Normal Line Voltage* to /*125 volts
>> per leg and 250 volts* *for both legs!*/
>
> REPLY:
>
> Nevertheless, I would ask the power company to fix it. If they refuse,
> then go from there.
>
> 73, Bill W6WRT
> dezrat at outlook.com
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
> ------------------------------
>
> Message: 9
> Date: Wed, 25 Jun 2014 16:00:06 -0400
> From: "Joe Subich, W4TV" <lists at subich.com>
> To: amps at contesting.com
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <53AB2A46.3070001 at subich.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> The issue is that the Quadra was designed for the Japanese market in
> an era where the common input power level was 100/200 V and typical
> maximum voltages were 220V. As such a 240 V maximum input voltage is
> entirely acceptable ... particularly considering that the 240 V spec
> even covers 110/220V that was common in North America at the time.
>
> The VP-1000 (Power Supply) manual specifies 14A at 200/220/234V input.
> I would be looking for a 250 to 220 V boost/buck transformer rated for
> 15A to be safe. Solid state amplifiers of this generation tend to
> have somewhat lower efficiencies than modern tube amplifiers - around
> 40 to 50%. At 1000W output the amplifier is specified for 48 A at 48V
> (2300 W) input - consistent with the rated 14A input.
>
> 73,
>
> ... Joe, W4TV
>
>
>> On 2014-06-25 3:25 PM, Bill Turner wrote:
>> ORIGINAL MESSAGE: (may be snipped)
>>
>>> On 6/25/2014 12:18 PM, Adrian Flynn wrote:
>>> If you monitor the line voltage closely you will find that the "Power
>>> Companies" are slowly raising the *Normal Line Voltage* to /*125 volts
>>> per leg and 250 volts* *for both legs!*/
>>
>> REPLY:
>>
>> Nevertheless, I would ask the power company to fix it. If they refuse,
>> then go from there.
>>
>> 73, Bill W6WRT
>> dezrat at outlook.com
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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>
>
> ------------------------------
>
> End of Amps Digest, Vol 138, Issue 23
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