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Re: Improving the lows in the SR400
On Fri, Sep 2, 2022 at 10:13 AM, k7wxk wrote:
My SR400 is a little tinny in the transmit audio. I'm using both the D104 and the ElectroMark, I have been using my SR-400 with an EV630 for many years and I don't get "tinny" reports at all!? I also use it with the HT32B and HT44 with same results. On the other hand, I have NEVER heard an SSB transmitter that sounded "good" with a D-104.? They're probably out there but they always seem to sound just "awful". Now, having said that, I routinely use my D-104 on an EF Johnson Valiant.? Everybody likes it best.? I also have 2 Shure Bros 444 mics that I use with a Drake C-Line, TR-4C, TR-6 and a KWM-2A? Everybody likes them too.? I have not tried the 444's on the Hallicrafters because I don't have the "right" plugs on them.? I suspect the 444's would be great for the "Scratchers" too! I also have and have used an Electrovoice 674 on all of the above equipment with good results but with a side-by-side comparison, everybody likes the 444's over the EV674. Because I know what will happen, I won't even waste my time trying the D-104 with any of my SSB equipment.? IMHO,? It's fine for AM transmitters and Chicken Band radios !? It's sort of like like avoiding the use of? lower sideband (on 160/75/40) ,? I try to distance myself from CB as far as possible!? (Only Amateurs and CB-ers use LSB.....the "rest" of the entire HF communications "world" only uses USB....but as is always, I digress) Also, someone mentioned it above(or below),? ensure that your carrier osc frequencies are spot on! Cheers, Rick WA6--- ? -- 73/Rick WA6III __________________________________ No critters were injured transmitting with Hallicrafters transmitters except the ones that wandered into the final amp cage "Bug-Motel"!! Bugs check-in, but they don't check-out.... they burn out! |
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Re: Improving the lows in the SR400
开云体育
Good idea Gary.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of wb6ogd <garywinblad@...>
Sent: Friday, September 2, 2022 12:46 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] Improving the lows in the SR400 ?
You might try moving the carrier oscillator a
little. ?Back in the day, my Hammarlund HX-50?
had terrible basey audio until I tweeked
it.
73,
Gary?
WB6OGD?
On Sep 2, 2022, at 10:13 AM, k7wxk <Mtniebs@...> wrote:
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Bird 43
Gents, Not a Hallicrafters, but I feel like most of you use them and are knowledgeable.? I knocked mine off a desk while moving a radio around, and it no longer works.? I first tried different slugs, no change. So I opened it to poke around.? Nothing stood out, but I took some continuity measurements and the only odd thing I find is that the center pins of the SO-239 don't seem to reach the meter, but the grounding side does. ? I gently pulled the tab in the slug well out and "brightened" every thing up with a tiny file. The coax connecting the chamber to the meter is in fine shape. I also put a resistor in series across the meter contacts and was able to deflect the meter with my VOM. I need help please. 73, Trent N4DTF EM55 VHF Plus Columnist, CQ Magazine I'm at a loss.? I've used different?RF sources and confirmed with a Diamond meter that RF exists. |
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Re: Improving the lows in the SR400
Thanks again. On Fri, Sep 2, 2022 at 11:05 AM waltcates <cateswa@...> wrote:
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Re: Improving the lows in the SR400
Walt,? Thanks for the input. Lot's to digest. I have a 444D which I believe is a dynamic mic. I'll not mess with the transceiver yet. Marc On Fri, Sep 2, 2022 at 10:55 AM waltcates <cateswa@...> wrote:
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Re: Improving the lows in the SR400
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I forgot?to mention a lot of 150 mic amplifiers have had bypass capacitors placed on R141 and R145. This does increase?the audio drive but it also boosts the high frequency response. Those two resistors were purposely left un-bypassed to reduce the high frequency
response.
Also, The EV-630 is a good mic for the 150. If it sounds tinny then most likely L14 and L15 need adjustment.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of k7wxk <Mtniebs@...>
Sent: Friday, September 2, 2022 12:13 PM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] Improving the lows in the SR400 ?
My SR400 is a little tinny in the transmit audio. I'm using both the D104 and the Electro
Voice? 630. Both are a bit thin, and I was wondering if there is something simple I might do to the mic amp section to bring out the bass. Marc-k7wxk? |
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Re: Improving the lows in the SR400
开云体育
This opens a real can of?worms.?
FIRST: There is an ongoing war between the technical purists and the folk-legends on the use of the D-104 on the SR series transceivers.
The audio response bandwidth is specked at 600Hz to 2800HZ
The D-104?
As you can see there is about 12-14 db difference between 600Hz and 2800Hz. There is also a tremendous?amount of energy above 2800Hz that is overdriving the sideband filter.
SECOND:
It is relatively easy to test the response of the 150.?
-LSB, RF LEVEL minimum, MIC GAIN at 50 to 60%, any band, attach scope to output of FL1, key transmitter? (ground pin 2 of mic connector.
-inject 0.005vrms into pin 1 of the mic connector. If L14 and L15 are aligned properly and FL1 is functional you should get a flat response from approximately 650HZ to 2700HZ with about a 3 db roll off at each end.?
THIRD: Read?
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of k7wxk <Mtniebs@...>
Sent: Friday, September 2, 2022 12:13 PM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] Improving the lows in the SR400 ?
My SR400 is a little tinny in the transmit audio. I'm using both the D104 and the Electro
Voice? 630. Both are a bit thin, and I was wondering if there is something simple I might do to the mic amp section to bring out the bass. Marc-k7wxk? |
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Re: Improving the lows in the SR400
Tnx Gary, I'll look into that. Marc On Fri, Sep 2, 2022, 10:46 AM wb6ogd <garywinblad@...> wrote:
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Re: SR-150 FS
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Yes, on the call. 816-524-7338. I will be at home from 9am to 1pm and after 5pm.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of Rick McNutt <mcnutt.rick@...>
Sent: Wednesday, August 31, 2022 8:30 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] SR-150 FS ?
Walt,?
This weekend would work for me. I am also retired. Only job I have these days is taking care of grandkids.
Can I call you tomorrow to discuss?
Rick McNutt
On Wed, Aug 31, 2022 at 21:24 waltcates <cateswa@...> wrote:
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Re: SR-150 FS
开云体育
Rick,
I am retired and pretty flexible. When do you think you are going to be in the Kansas City area.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of Rick McNutt <mcnutt.rick@...>
Sent: Wednesday, August 31, 2022 8:15 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] SR-150 FS ?
Walt,
I would like to purchase this ST-150. I can come pick it up at your convenience.
Rick McNutt
W1JRM?
875-712-5062
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SR-150 FS
开云体育
Clearing shelves.? LOCAL PICKUP ONLY in Lee's Summit Mo (Kansas City area).
This SR-150 and power supply was refurbished in 2019. Has not been used since completed.?
Benched today 80, 40, 20, and 15-meters, RX and TX meet spec.?
10-meters a little weak.
The K2/K3 issues are resolved.
Front panels, SR is a 9, PS is a 7.
Cases need?to be painted.
\
AS IS $525
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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Re: New to group. HT-40 & SX-140
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Yes, I read it to the end. I have not had the opportunity?to run an HT-40 with an SX-140 so I could not offer suggestions in that area. I have however listened to a lot of people running D104's on "H" gear. The echos and ringing are not pleasant, so I offered
a suggestion for a better sounding mic.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of Robert Needleman via groups.io <k3ac@...>
Sent: Tuesday, August 30, 2022 11:22 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] New to group. HT-40 & SX-140 ?
Am I the only one who read Dave's? message through to the end? He was asking about how to spot the Rx/Tx using the HT40/ SX-140 combo. Not the pros/cons of using a? D-104 mike.
?
Bob K3AC
In a message dated 8/30/2022 11:56:56 PM Eastern Standard Time, 1oldlens1@... writes: ?
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Re: New to group. HT-40 & SX-140
开云体育
The D104's boosted high frequency output is, arguably, not too much of a problem on the HT-40. However on the SSB rigs it will create havoc. The audio band pass on SSB on the "H" rigs is listed 500Hz - 2700Hz or 500Hz - 3200Hz. In these rigs the D104 will over
drive the sideband filters and cause splatter outside the desired bandwidth.
I have not tested the HT-40 with overdrive out side the normal audio bandwidth for AM emissions. If I get my hands on a 40 I'll have to test that and see what flows from the antenna jack.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of Richard Knoppow <1oldlens1@...>
Sent: Tuesday, August 30, 2022 10:56 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] New to group. HT-40 & SX-140 ?
I want to reinforce Walts statement.? If you like the sound of a D 104 bypass the internal amplifier.? Instructions for doing this are on the web.? Without the amo the D 104 is still one of the highest output mics ever on the market .? It should
not overdrive the rig but eill have plenty of output.
Note that the D 104 is designed for high intelligibility under noisy conditions .? It boosts the highes and rolls off the.lows.? I have always found them tinny sounding.
Fwiw the D 204 was the fir D t crystal mic on the market (c 1933) early on there were a couple of versions including one with flat response. Crystal mics and phonograph pickups were popular at a time when electronic amplification was expensive,?
the high output could save a stage if amplification.? Unfortunately crystals are vulnerable to moderate heat (a hot day),? humidity? and mechanic as l shock.?
-------- Original message --------
From: waltcates <cateswa@...>
Date: 8/30/22 7:39 PM (GMT-08:00)
Subject: Re: [HallicraftersRadios] New to group. HT-40 & SX-140
Great find. You may want?to rethink the choice of microphones. Like most all of the Hallicrafters of the 50's, 60's and 70's the HT-40 was designed?to function with a dynamic microphone. Over driving the audio ckts will cause spurs and garbled audio.
For more information on microphone selection for Hallicrafters rigs see:?
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
From: [email protected] <[email protected]> on behalf of Dave via groups.io <kc3am@...>
Sent: Tuesday, August 30, 2022 7:55 PM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] New to group. HT-40 & SX-140 ?
Hello everyone. I have been gifted with a HT-40 & SX-140 in relatively good shape. The tubes check ok at the moment. I am getting about 45 watts on 40M so that seems OK. I am planning on using an amplified D-104 and make an attempt at a AM contact. I have
a T/R relay in operation being controlled by the TX and that works well. I am learning how to use the RX which is a bit different. Licensed in 1977 my first rig was a HW-101 so no split operation experience from that era. Also gifted was a Drake 2-NT & 2B
(which has been replaced by a 2C). A HA-5 VFO is here also to use on either rig. My initial question is how do I spot the TX & RX? I have not quite figured out how to do that yet.
Thanks for any help and suggestions, Dave KC3AM |
Rick W7IMM
waltcates
Trent N4DTF EM55
k7wxk