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@contesting.com wrote:
>
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> When replying, please edit your Subject line so it is more specific
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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@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@gmail.com>
> To: "amps@contesting.com" <amps@contesting.com>
> Subject: [Amps] Buck-Boost Transformer Selection
> Message-ID:
> <CAC5FBO8zG29wfD0QajtL89UMq=nvGBY_VVfcmesR-GTmu6zNjw@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@miamioh.edu>
> To: "'Richard Solomon'" <dickw1ksz@gmail.com>, <amps@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@contesting.com] On Behalf Of Richard
> Solomon
>> Sent: Wednesday, June 25, 2014 11:06 AM
>> To: amps@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@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 25 Jun 2014 13:35:14 -0400
> From: "Carl" <km1h@jeremy.mv.com>
> To: "Richard Solomon" <dickw1ksz@gmail.com>, <amps@contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <250702D59E5244AF863886F32DB7F11D@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@gmail.com>
> To: <amps@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@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@outlook.com>
> To: amps@contesting.com
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <BLU436-SMTP855D3ED88FE81DD8B871F7C0190@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@outlook.com
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 25 Jun 2014 13:51:49 -0500
> From: w5ov@w5ov.com
> To: amps@contesting.com
> Subject: [Amps] Whither all band sw bandpass filters
> Message-ID: <14be13f838932009c0812075677d6b1b.squirrel@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@dougronald.com>
> To: <amps@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@contesting.com] On Behalf Of Bill Turner
> Sent: Wednesday, June 25, 2014 11:18 AM
> To: amps@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@outlook.com
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 25 Jun 2014 12:25:28 -0700
> From: Bill Turner <dezrat@outlook.com>
> To: Adrian Flynn <adrianjamesflynn@gmail.com>, Amps
> <amps@contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <BLU436-SMTP474EC472826A73526FDE3BC0190@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@outlook.com
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 25 Jun 2014 12:42:54 -0700
> From: Glen Zook via Amps <amps@contesting.com>
> To: Bill Turner <dezrat@outlook.com>, Adrian Flynn
> <adrianjamesflynn@gmail.com>, Amps <amps@contesting.com>
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID:
> <1403725374.86915.YahooMailNeo@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@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@outlook.com
> _______________________________________________
> Amps mailing list
> Amps@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@subich.com>
> To: amps@contesting.com
> Subject: Re: [Amps] Buck-Boost Transformer Selection
> Message-ID: <53AB2A46.3070001@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@outlook.com
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> ------------------------------
>
> End of Amps Digest, Vol 138, Issue 23
> *************************************
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