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Re: Speaker?
I'd say that it all depends on how you're using the rig.? If your Drake stuff falls into the "Shelf Queen" category, then the stock MS-4 is the way to go.? My C-line is in daily use along with my other vintage gear and the MS-4 is a loser for several reasons: It sounds terrible, it takes up too much space and the fact that most folks house the AC-4 in it restricts where you can place it on the operating desk.? I've found that speakers designed for home theatre or music use are a far better choice as they tend to sound great for communications use, are far smaller and can be had for a fraction of what you'd pay for any speaker offered for amateur radio use.? A few years back, speaker manufacturers were convinced that everyone would be buying surround sound speaker systems for their TV system, and cranked out zillions of "surround sound speakers" to be used at the rear of the listening area.? These tended to be much smaller than the main speakers, but with very good performance.? Today those speakers are sitting on shelves in Goodwill and Salvation Army stores at giveaway prices.
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I have a number of them with Sony and RCA logos on them, obtained from a large "used stuff" store in Winston-Salem, NC.? A couple of them match the Drake gear perfectly and are the right color and size.? Such speakers are typically either ported or acoustic suspension, so have low end response that produces a good sound for SSB.? ?Another good speaker alternative are the ones made for use with a PC.? ?West Mountain Radio makes a pair of powered speakers labeled "COMspkr".? While those are powered speakers, one of the pair just has an RCA speaker connection.?
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I don't believe that wide range or hi-fi speakers are unsuited for amateur radio use.? If you use them and are hearing unwanted hiss, fix the audio source to eliminate it.? I use an old Timewave DSP-59+ between the receivers and speaker to shape the audio to my liking and eliminate power supply hum and high end hiss.? The LogiKit SCAF-1 filter is another good choice for that purpose.? ?
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73, Floyd - K8AC |
Re: Small lamp reference for Drake L7
And I would highly recommend choosing the ones with insulated leads. Spend the extra money.? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Thu, Jan 2, 2025 at 22:07, Jim Shorney via groups.io <jimNU0C@...> wrote:
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Re: T-4XC has a "condition"
Dean....you wrote.... OK guys, ? Here is an observation. I just cleaned the power connection and decided to check the bias again. All knobs turned to ¡°0¡±. Now, on the RF tune I see a ¡°0¡± in the 10 meter section. At this point I can get the bias to the tick mark. Now I see another ¡°0¡± in the 160 meter range. The lowest bias setting here is .3 amps ? With the bias set now the tune procedure is closer to what I see on videos and I get a grid dip. But for normal operation all knobs are fully CW. ? Dean Sorry but I am losing you here with some of your statements about the "zero" you are getting at 10m and 160.? What "zero" are you talking about? Start on 40m. Mode switch in SSB position. Band switch?set on 40m.? Plate Tune about 10 o'clock....Load about 10 o'clock.? RF Tune set at 40m.? RF wattmeter in line on the transmitter output to a 50 ohm dummy load.? GAIN Control set?AT ZERO - all the way counter-clockwise!!!!!! Key up the T-4XC with a microphone?PTT? and no audio.....OR put the Mode switch into TUNE.? ?Adjust?the bias pot on AC-4 power supply to set at 70 ma (the tick mark) on the T-4XC plate current meter. If that goes OK, then switch the MODE switch to TUNE and increase the GAIN control until you see the meter rise slightly, then peak that reading with the RF Tune control.? You should see some output on the wattmeter. Quickly peak the PLATE control for maximum output, which should correspond pretty closely to a dip in the PLATE CURRENT.? Increase the load control from the 10 o'clock position slightly, and increase?GAIN slightly, then dip the Plate Current again to a minimum with the PLATE control. Increase the GAIN control again and do all that once more.? Keep that process?up until you have about 250-300mA Plate current when the Plate control is dipped and output is at about 120w or so.? Keep the transmissions?short...allow cooling time if needed...which is likely as a beginner.? This whole process becomes much quicker with practice! You will find that the LOAD control needs to be at around 10 o'clock?for 80/40m and maybe 12 to 2 o'clock for the higher bands when all tuned up. Same (+/-) for the PLATE control. At no time should you see Plate?Current pin to the right!? If so...something is wrong.? Mistuned...gain too high...bad output cable or load etc. Good luck!? Hope I've spelled this out correctly.? Doing it from memory.? Others are welcome to chime in! 73 Peter VE7PS 73 Peter VE7PS On Thu, Jan 2, 2025 at 2:44?PM Dean N2TNN via <N2tnn=[email protected]> wrote:
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Re: Small lamp reference for Drake L7
The SSB lamp is a NE-2H neon. The rest are generic instrument lamps. Probably 24V since they run from 22VAC with a 150 Ohm series resistor. You might want to measure the AC voltage across one that is lit. They can be found with or without the long insulated wire leads.
On Thu, 02 Jan 2025 12:47:24 -0800 "Mohamed VA2MKX via groups.io" <va2mkx@...> wrote: Hello, -- 73 -Jim NU0C |
Re: TR7 Audio
In the commercial 2-way radio business this was a feature, not a bug. Kept the dispatcher from turning the volume all the way down either accidentally or on purpose.
On Thu, 2 Jan 2025 15:48:10 -0600 "Gary Follett via groups.io" <xntrick1948@...> wrote: Later TR7¡¯s did not suffer this problem. It seems the pot was changed to one which got to zero ohms before the click.-- 73 -Jim NU0C |
Re: T-4XC Sideband adjustments?
BTW, the one with the long shaft is for balancing the carrier, along with the 10-turn pot.? These three adjustments are in the same patch of real estate. Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, January 2nd, 2025 at 5:50 PM, Steve Wedge, W1ES <w1es@...> wrote:
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Re: T-4XC Sideband adjustments?
I turn it and it just spins and spins. doesnt?seem to change anything. Ed On Thu, Jan 2, 2025 at 4:50?PM Steve Wedge, W1ES/4 via <w1es=[email protected]> wrote:
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Re: T-4XC Sideband adjustments?
the one with the slot.? If you are on frequency, you may have a bad crystal filter. Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, January 2nd, 2025 at 5:47 PM, Ed KG5UN via groups.io <maikranze@...> wrote:
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Re: T-4XC Sideband adjustments?
Carrier oscillator is on freq. Sorry but I still dont?know where C-6 is. Is it the big silver looking thing with a slot for a screw driver?or the taller looking thing against the back of the chassis?with the slug sticking out of it? On Thu, Jan 2, 2025 at 4:41?PM Steve Wedge, W1ES/4 via <w1es=[email protected]> wrote:
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Re: T-4XC has a "condition"
¿ªÔÆÌåÓýOK guys, ? Here is an observation. I just cleaned the power connection and decided to check the bias again. All knobs turned to ¡°0¡±. Now, on the RF tune I see a ¡°0¡± in the 10 meter section. At this point I can get the bias to the tick mark. Now I see another ¡°0¡± in the 160 meter range. The lowest bias setting here is .3 amps ? With the bias set now the tune procedure is closer to what I see on videos and I get a grid dip. But for normal operation all knobs are fully CW. ? Dean ? From: [email protected] <[email protected]>
On Behalf Of VE7PS via groups.io
Sent: Thursday, January 2, 2025 1:06 PM To: [email protected] Subject: Re: [DRAKE-RADIO] T-4XC has a "condition" ? Barry...indeed, check for correct idling current with zero drive. Adjust it using the bias control on the AC-4 power supply.? You are aiming for about 70 mA (the "tick mark"). ? Also.....practice tuning up into a known good 50 Ohm load rated at 150w or better with known good cables first.? Dump the "tuner" for now.? I would put a wattmeter inline to the 50 ohm load if you have one,?rather than trying to use the internal relative output meter.? That way there are fewer buttons to "mess" with until you are comfortable with the tune-up process. ? And if you are pinning the ammeter...STOP right away, as something is wrong!? Back off the drive and try again. ? 73 and GL ? Peter VE7PS ? On Thu, Jan 2, 2025 at 9:19?AM Barry KJ5GQM via <chasbg=[email protected]> wrote:
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Re: Replacing T4XC Finals?
Film resistors will work fine. Use the same coils. The final tubes should be 6JB6's Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, January 2nd, 2025 at 3:30 PM, Jay W6CJ via groups.io <lastradioman@...> wrote:
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Re: T-4XC Sideband adjustments?
Check that your carrier oscillator is at 5645 kHz.? C6 is the ceramic trimmer on top of the chassis, right-rear corner area. If your CO is on-frequency, you could have a bad filter.? Rare, but it happens. Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, January 2nd, 2025 at 5:09 PM, Ed KG5UN via groups.io <maikranze@...> wrote:
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Re: TR7 Audio
My TR7A still has the annoying feature of not going to no signal. Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, January 2nd, 2025 at 4:48 PM, Gary Follett via groups.io <xntrick1948@...> wrote: Later TR7¡¯s did not suffer this problem. It seems the pot was changed to one which got to zero ohms before the click.? |
Re: Replacing T4XC Finals?
Peter, Oops... I meant 6JB6A's.?? The NOS 6JB6A tubes I see for sale are never listed as "matched pair".... is that going to be a problem? Thanks for the screen resistor advice. 73 Jay W6CJ On Thu, Jan 2, 2025 at 1:48?PM VE7PS via <ve7ps=telus.net_at_groups.io_lastradioman@...> wrote:
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Re: Speaker?
I don't actually know but suspect they are the same. Pillow stuffing would work OK and is likely cheaper. Anything sold for audio seems to become expensive.
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On 1/2/2025 1:56 PM, Stan Gammons via groups.io wrote:
I've wondered if the Acousta-Stuf? Polyfil is the same as the Poly-Fil pillow stuffing one can buy at Walmart? --
Richard Knoppow Los Angeles WB6KBL SKCC 19998 |
Re: Speaker?
¿ªÔÆÌåÓýI've wondered if the Acousta-Stuf? Polyfil is the same as the Poly-Fil pillow stuffing one can buy at Walmart?73 Stan KM4HQE On 1/2/25 13:52, Joe - W7RKN via
groups.io wrote:
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SE-3 Question
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Rob ¡ª I read somewhere that the last version of the SE-3, with the addition of the "AR" switch on the front panel, involved only the addition of the switch and a 100k resistor.? Can you please confirm that's correct and if so, explain where the 100k resistor
is connected?? ?
Thanks, and happy new year!
Regards,
Art Delibert, KB3FJO
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