Re: Drake T4XC and D-104 wiring
A Note: This data sheet shows an attenuator pad, if you don't want to by-pass the amplifier I strongly suggest you use this pad. The white wire referred to is inside the base.
The D-104 has been a favorite mic for ham use for ninety years! The D-104 was the first commercially available crystal mic (1933). Originally both a flat response and rising response version were available but the rising response one was the more popular and survived.
Beware, as is warned in the data sheet, that crystal mics won't stand high temperatures, much above about 110F the crystal will melt into mush. They are also sensitive to high humidity. Although all commercial crystal mics and phono pickups were protected against moisture that protection is limited. Again, the element will turn to mush. They are also sensitive to mechanical shock. Ceramic elements are more rugged (take high temperatures) and modern electret mics are far more rugged as are moving coil mics.
Crystal elements became very popular for microphones and phonograph pickups because they have quite high output, often saving the cost of a stage of tube amplification, and can be quite high fidelity. Crystals were also used as sound generators for headphones and for cutting heads for disc recorders in both of which they could be damaged by overdriving. Out of about ten Brush crystal headphones I found only one that still worked, not one pair, mind you, just one phone. So, when you buy a crystal anything be aware that the failure rate is pretty high.
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On 2/23/2024 7:44 AM, Richard Knoppow wrote: ?? Is this an amplified mic, sound like it might be. The T4 (any) does not need an amplified mic.
?? The mic connector on the transmitter has three active connections: Tip=transmit switch, Ring=Audio, Shield=return for both.
?? Some D-104 mics have two wires for the push to talk since some transmitters require a separate return for the PTT from the Audio.
?? There are a number of D-104 instruction sheets on line. I am attaching one that might be correct. Its for the "Silver Eagle" version but there are stardard versions of the amplified mic that are the same. The color code on this sheet looks right for your mic.
??? Note that this is an amplified mic. If yours is I strongly advise by-passing the amplifier and connecting the mic element directly to the transmitter.
On 2/23/2024 7:20 AM, Bill Losef via groups.io wrote:
Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
??Can someone share what color wires go to the Drake Mic plug connector?
William LosefskyN1WL
Call
Send SMS
Add to Skype
You'll need Skype CreditFree via Skype
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark
On Thu, Feb 22, 2024 at 9:28?PM Gary WB6OGD <winbladgary@... <mailto:winbladgary@...>> wrote:
??? Mark,
??? Forget the new radio and just look at the TR-4.
??? Use the calibrator and adjust the dial so? the calibrator is zero
??? beat and the dial reads 21.300.
??? Now, you are receiving exactly on 21.300.? In USB and LSB your are
??? transmitting on exactly 21.300.
??? If you now go to CW or AM, the carrier is offset from 14.300 by
??? probably the 895Hz so you are transmitting on 21.300.895.
??? This is done for the dual purpose that the carrier needs to go
??? through the crystal filter and for CW you need to tune off off zero
??? beat to hear received signals.
??? Your TR-4 is normal.
??? 73,
??? Gary
??? WB6OGD
--
Mark "Fleisch" Fleischer
*KF?KZP*
*
*
*
*
*Public Address Announcer/Voice Over/Production Specialist:*
UM-Duluth Football <>, UM-Duluth Women's Hockey <>, UW-Superior Athletics <>, CSS Soccer <>, Proctor High School?Athletics <>, Proctor-Hermantown Mirage Hockey <>, Gondik Law Speedway <>(Superior), Hibbing Raceway <> and Halvor Lines Speedway <>(Proctor)
Email: fleischtpnl@... <mailto:fleischtpnl@...>
Cell: (218) 591-5406
<>??? Virus-free.www.avg.com <>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Re: Drake T4XC and D-104 wiring
Yep. It¡¯s in the manual. The two grounds get tied together at the connector.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 10:32, Bill Losef via groups.io < w.losefsky@...> wrote: Ok, but to get to the basics, is the very tip of the plug the PTT? Is the middle of the plug the MIC? and is the shaft GRND?
? ?William Losefsky? ?????????
On Friday, February 23, 2024 at 10:28:40 AM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
Bill, I¡¯d ring-out the connections with an ohmmeter. D-104¡¯s have been around a long time and who knows how many times the wiring may have been changed?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 10:20, Bill Losef via groups.io < w.losefsky@...> wrote: Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
?Can someone share what color wires go to the Drake Mic plug connector?
?William Losefsky N1WL ?????????
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
-- Mark "Fleisch" Fleischer KF?KZP 
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
Re: Drake T4XC and D-104 wiring
Hi Richard,
Yes, this is an amplified version and I wanted to try it at a low setting as my audio reports have come back as pinchy and narrow.
Bill N1WL
? ?William Losefsky? ?????????
On Friday, February 23, 2024 at 10:45:08 AM EST, Richard Knoppow <1oldlens1@...> wrote:
? ? Is this an amplified mic, sound like it might be. The T4 (any) does
not need an amplified mic.
? ? The mic connector on the transmitter has three active connections:
Tip=transmit switch, Ring=Audio, Shield=return for both.
? ? Some D-104 mics have two wires for the push to talk since some
transmitters require a separate return for the PTT from the Audio.
? ? There are a number of D-104 instruction sheets on line. I am
attaching one that might be correct. Its for the "Silver Eagle" version
but there are stardard versions of the amplified mic that are the same.
The color code on this sheet looks right for your mic.
? ? Note that this is an amplified mic. If yours is I strongly advise
by-passing the amplifier and connecting the mic element directly to the
transmitter.
On 2/23/2024 7:20 AM, Bill Losef via groups.io wrote: > Folks, > > I have a Drake T4XC and trying to figure out the D-104 wiring onto the > Drake plug. Lots of stuff on the net and much of it conflicting. > > Here is the color code of wires coming off the D-104 > > Blue = > White = > Red = > Yellow = > Black = > Shield = > >? ?Can someone share what color wires go to the Drake Mic plug connector? > William LosefskyN1WL > > Call > Send SMS > Add to Skype > You'll need Skype CreditFree via Skype > > > On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP > < fleischtpnl@...> wrote: > > > Thanks Gary! > > That makes me feel much better.? Will try it and let you know > the?outcome.? Really appreciate the help! > > Mark > > On Thu, Feb 22, 2024 at 9:28?PM Gary WB6OGD < winbladgary@... > <mailto:winbladgary@...>> wrote: > >? ? Mark, >? ? Forget the new radio and just look at the TR-4. > >? ? Use the calibrator and adjust the dial so? the calibrator is zero >? ? beat and the dial reads 21.300. > >? ? Now, you are receiving exactly on 21.300.? In USB and LSB your are >? ? transmitting on exactly 21.300. > >? ? If you now go to CW or AM, the carrier is offset from 14.300 by >? ? probably the 895Hz so you are transmitting on 21.300.895. >? ? This is done for the dual purpose that the carrier needs to go >? ? through the crystal filter and for CW you need to tune off off zero >? ? beat to hear received signals. > >? ? Your TR-4 is normal. >? ? 73, >? ? Gary >? ? WB6OGD > > > > -- > Mark "Fleisch" Fleischer > > *KF?KZP* > > * > * > > * > * > *Public Address Announcer/Voice Over/Production Specialist:* > UM-Duluth Football <>, UM-Duluth > Women's Hockey <>, > UW-Superior Athletics <>, CSS Soccer > <>, Proctor High School?Athletics > <>, Proctor-Hermantown Mirage Hockey > <>, Gondik Law Speedway > <>(Superior), Hibbing Raceway > <> and Halvor Lines Speedway > <>(Proctor) > > Email: fleischtpnl@... <mailto:fleischtpnl@...> > Cell: (218) 591-5406 > > > > <>??? Virus-free.www.avg.com <> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > -- Richard Knoppow Los Angeles WB6KBL SKCC 19998
|
Re: Drake T4XC and D-104 wiring
It would be helpful to remove the three screws from the bottom plate of the D104 and attach an image of the wiring and to determine if you have an amplified base. ?One goal is to isolate the audio ground shield conductor from a dedicated PTT ground turn lead in the mic base.? The two conductors will then bond to chassis ground at the TR-4C¡¯s mic jack.? Reason:? by forcing the PTT return current on its own conductor separate and apart from the grounded mic shield, clicks and pops are minimized when activating the D104¡¯s PTT arm.? All but Astatic¡¯s ¡°G¡± only base have enough conductors and based on your description below you have a D104 base with enough conductors to make this work.??? ? Paul, W9AC?
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On Fri, Feb 23, 2024 at 10:20, Bill Losef via groups.io < w.losefsky@...> wrote: I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting. Here is the color code of wires coming off the D-104 ?Can someone share what color wires go to the Drake Mic plug connector? On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote: Thanks Gary! That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help! ? Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD ?
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
Re: Drake T4XC and D-104 wiring
Is this an amplified mic, sound like it might be. The T4 (any) does not need an amplified mic.
The mic connector on the transmitter has three active connections: Tip=transmit switch, Ring=Audio, Shield=return for both.
Some D-104 mics have two wires for the push to talk since some transmitters require a separate return for the PTT from the Audio.
There are a number of D-104 instruction sheets on line. I am attaching one that might be correct. Its for the "Silver Eagle" version but there are stardard versions of the amplified mic that are the same. The color code on this sheet looks right for your mic.
Note that this is an amplified mic. If yours is I strongly advise by-passing the amplifier and connecting the mic element directly to the transmitter.
toggle quoted message
Show quoted text
On 2/23/2024 7:20 AM, Bill Losef via groups.io wrote: Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
?Can someone share what color wires go to the Drake Mic plug connector?
William LosefskyN1WL
Call
Send SMS
Add to Skype
You'll need Skype CreditFree via Skype
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark
On Thu, Feb 22, 2024 at 9:28?PM Gary WB6OGD <winbladgary@... <mailto:winbladgary@...>> wrote:
Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero
beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are
transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by
probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go
through the crystal filter and for CW you need to tune off off zero
beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
--
Mark "Fleisch" Fleischer
*KF?KZP*
*
*
*
*
*Public Address Announcer/Voice Over/Production Specialist:*
UM-Duluth Football <>, UM-Duluth Women's Hockey <>, UW-Superior Athletics <>, CSS Soccer <>, Proctor High School?Athletics <>, Proctor-Hermantown Mirage Hockey <>, Gondik Law Speedway <>(Superior), Hibbing Raceway <> and Halvor Lines Speedway <>(Proctor)
Email: fleischtpnl@... <mailto:fleischtpnl@...>
Cell: (218) 591-5406
<> Virus-free.www.avg.com <>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Re: Drake T4XC and D-104 wiring
Ok, but to get to the basics, is the very tip of the plug the PTT? Is the middle of the plug the MIC? and is the shaft GRND?
? ?William Losefsky? ?????????
On Friday, February 23, 2024 at 10:28:40 AM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
Bill, I¡¯d ring-out the connections with an ohmmeter. D-104¡¯s have been around a long time and who knows how many times the wiring may have been changed?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 10:20, Bill Losef via groups.io < w.losefsky@...> wrote: Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
?Can someone share what color wires go to the Drake Mic plug connector?
?William Losefsky N1WL ?????????
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
Re: Drake T4XC and D-104 wiring
Bill, I¡¯d ring-out the connections with an ohmmeter. D-104¡¯s have been around a long time and who knows how many times the wiring may have been changed?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 10:20, Bill Losef via groups.io < w.losefsky@...> wrote: Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
?Can someone share what color wires go to the Drake Mic plug connector?
?William Losefsky N1WL ?????????
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
I resemble that remark.?
Steve Wedge, W1ES/4
(Owner of both a TR-6 and a TR6)
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 10:12, Jim Shorney < jimNU0C@...> wrote:
As long as it is a radio, not a car.
73
-Jim
NU0C
On Fri, 23 Feb 2024 06:42:22 -0800
"Dave Cutts via groups.io" <g4faw@...> wrote:
> Is it acceptable to advertise a TR7 for sale on this group? Thanks Dave G4FAW
|
Remember also that the accuracy of the frequency readout is +/- 1kHz. I think we have all become accustomed to super-accurate readouts on our newer gear.?
And yes, that approximately 900 Hz offset is completely normal and expected.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Fri, Feb 23, 2024 at 09:24, Mark KF0KZP < fleischtpnl@...> wrote: Thanks Gary!
That makes me feel much better. Will try it and let you know the outcome. Really appreciate the help!
Mark
Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300. In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
--
Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:
, , , , , , (Superior), and (Proctor)
|
Drake T4XC and D-104 wiring
Folks,
I have a Drake T4XC and trying to figure out the D-104 wiring onto the Drake plug. Lots of stuff on the net and much of it conflicting.
Here is the color code of wires coming off the D-104
Blue =
White =
Red =
Yellow =
Black =
Shield =
?Can someone share what color wires go to the Drake Mic plug connector?
?William Losefsky N1WL ?????????
On Friday, February 23, 2024 at 09:24:56 AM EST, Mark KF0KZP <fleischtpnl@...> wrote:
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark
Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
As long as it is a radio, not a car. 73 -Jim NU0C On Fri, 23 Feb 2024 06:42:22 -0800 "Dave Cutts via groups.io" <g4faw@...> wrote: Is it acceptable to advertise a TR7 for sale on this group? Thanks Dave G4FAW
|
Is it acceptable to advertise a TR7 for sale on this group? Thanks Dave G4FAW?
|
Re: Another TR7 Journey begins
OK, here is what I would do. First, thoroughly inspect the area of the oscillator circuit with a magnifier and good lighting. Look for suspicious solder joints (especially where a connection is made through a plated through hole, a.k.a. VIA), copper trace breaks, hairline shorts, etc. Clean any flux residue you might find. Take the piston trimmer apart to see if you can figure out why it is binding. There is no advanced phlebotinum or magic server pixie dust inside, it is just cleverly made from common materials. You could probably make one with materials from Ace Hardware. Or find a replacement that is close in value and about the same physical size or smaller and adapt it to fit. It is only two electrical connections. We learn. 35 years ago the TR7 scared the hell out of me. After a lot of tinkering and a few mistakes I understand it pretty well. In the end it's just a radio, made out of dirty sand and carbon. And it is user serviceable. 73 -Jim NU0C On Thu, 22 Feb 2024 15:31:51 -0800 "Bill NZ0T" <nz0tham@...> wrote: Jim I understand but not all of us have your expertise and sometimes just want to the radio working lol.? I had no trouble at all with the 20 WPM part fo the old Extra test but the theory was a big time struggle for me.? Sometimes I can muddle along and fix something but I'm a horrible tech.
73, Bill NZ0T
-- 73 -Jim NU0C
|
Thanks Gary!
That makes me feel much better.? Will try it and let you know the?outcome.? Really appreciate the help!
Mark
Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
I am looking for either a 2CS speaker or 2CQ Q Multiplier for my 2C receiver, if anyone has one for sale or knows of any for sale. Thanks, Rick NJ5W
|
Re: RV-75 only decrements
If the frequency only changes up or down no matter which way you turn the knob one of the optical interrupters might be bad, misaligned, or the bias is not set correctly. ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of K6OXN Bob
Sent: Thursday, February 22, 2024 10:20 PM
To: [email protected]
Subject: Re: [DRAKE-RADIO] RV-75 only decrements ? Well I have checked all the frequencies used for a ref in the rv-75. When I turn it on with 7 mhz selected, I get 7250.1 all bands check out like this. I cannot get it to increase in freq only decrease whichever way I turn the knob. I am at my wits end with this for now. Will place it on back of bench for awhile.? All voltage ref's are good or within spec.
|
Re: RV-75 only decrements
I'm seeing mixed messages from you. First it only decrements, then it the direction it tunes is opposite what you expect, now it only decrements again? Which is it? Did you perform the checks here?: /g/DRAKE-RADIO/message/76205If so, what did you see? If not, do so and report back what you find. That will help narrow down the issue. What you have reported so far is roughly the radio equivalent of "my car is making a funny noise, what's wrong with it?" At this point the only answer that can be given is "It's broken". 73 -Jim NU0C On Thu, 22 Feb 2024 19:20:15 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: Well I have checked all the frequencies used for a ref in the rv-75. When I turn it on with 7 mhz selected, I get 7250.1 all bands check out like this. I cannot get it to increase in freq only decrease whichever way I turn the knob. I am at my wits end with this for now. Will place it on back of bench for awhile.? All voltage ref's are good or within spec.
|
Mark,
Forget the new radio and just look at the TR-4.
Use the calibrator and adjust the dial so? the calibrator is zero beat and the dial reads 21.300.
Now, you are receiving exactly on 21.300.? In USB and LSB your are transmitting on exactly 21.300.
If you now go to CW or AM, the carrier is offset from 14.300 by probably the 895Hz so you are transmitting on 21.300.895.
This is done for the dual purpose that the carrier needs to go through the crystal filter and for CW you need to tune off off zero beat to hear received signals.
Your TR-4 is normal.
73,
Gary
WB6OGD
?
|
Re: RV-75 only decrements
Well I have checked all the frequencies used for a ref in the rv-75. When I turn it on with 7 mhz selected, I get 7250.1 all bands check out like this. I cannot get it to increase in freq only decrease whichever way I turn the knob. I am at my wits end with this for now. Will place it on back of bench for awhile.? All voltage ref's are good or within spec.
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Re: RV-75 only decrements
This is an option, not a problem. See page 2-2 of the manual, re: J-104. 73 -Jim NU0C On Thu, 22 Feb 2024 16:41:07 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: Well after replacing all the electrolytics the 75 seems to work somewhat.? Freq is stable, but if I turn the knob CCW the freq increases and if I turn it CW it decreases. So what do I look at for this problem. I can adjust all the freq's listed in section 5 but I don't know about the reversal. Maybe I have the Optical drive connectors on wrong.? Will look at that next. Otherwise it seems to work.
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Paul Christensen
Jim Shorney
Rick NJ5W
Gary WB6OGD