Re: OT: Coax bypass switches
On Sat, May 4, 2024 at 01:26 PM, Lyndon VE7TFX wrote:
I consulted
the MN-4C. It uses a four position ceramic wafer switch.
Case closed.
Lyndon; There is a "bypass" function on the Drake MN-4C tuner, but it isn't part of the 4-position (actually, 5-position) "ANT" switch. It's actually implemented with the "DIRECT" position of the 7-position "BAND" switch. Connecting to a dummy load isn't part of the "BAND" switch functions... that's a function of the "ANT" switch. A schematic of the MN-4C tuner can be found on the WB4HFN website, here: Note that "BAND" switch is a two-sided wafer switch... looking at the schematic, you can see that going into and out of the "DIRECT" position on the "BAND" switch: The top section (one side of the switch) connects the transmitter input to the antenna only in the "DIRECT" position, and connects the tuner circuit output to the antenna in all but the "DIRECT" position. The bottom section (other side of the switch) connects the transmitter input to the input of the tuner circuit only when the switch is away from the "DIRECT" position.
If you omit the band-selection feature, you could achieve the same functionality with a two-position DPDT wafer switch, like this one on eBay: . Mark - AD7EF
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Re: OT: Coax bypass switches
Lyndon
Try heath coax SD-1234 1 kw all unused ended
Not sure about vhf
Bill
WB2UFC
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On May 3, 2024, at 2:19?PM, Lyndon VE7TFX via groups.io <lyndon@...> wrote:
?Sorry folks, I should have been more specific.
I'm looking for a mechanical switch, not a relay. And it
needs to handle at least a couple of hundred watts.
--lyndon
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Re: OT: Coax bypass switches
Get it while the getting's good. MFJ is going out of business..
- Jerry, KF6VB
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On 2024-05-04 12:28, Mike W5CUL wrote: Not sure who was the originator of the question, I just joined the
group. But if the operator is looking for a mechanical switch for
which to bypass an inline component such as an Antenna Tuner or maybe
an Amplifier, here is one I have used in the past.
I used this to bypass an amplifier when switching in older boat
anchors who¡¯s output power superseded the power pass through
capability of the inline amplifier. It worked pretty well and was
only one switch to flip.
Thank you,
Mike
W5CUL
FROM: [email protected] <[email protected]> ON BEHALF OF Mark
Davis
SENT: Saturday, May 4, 2024 1:56 PM
TO: [email protected]
SUBJECT: Re: [DRAKE-RADIO] OT: Coax bypass switches
On Sat, May 4, 2024 at 06:48 AM, Robin K4IDC wrote:
Robin;
That's useful info, but I don't see any discussion of power-handling
capabilities for the DIP/SMT (non-coaxial) relays. I don't believe
they'd be suitable for handling 200W at 6M.
Also, for the transfer-switch functionality, where you would
completely disconnect the tuner circuitry from the transmit path,
you'd still need a DPDT relay or a pair of SPDT relays... or a coaxial
relay something like the Dow-Key 412 series, with 4 ports (type N),
and contacts arranged like this:
(see
)
[1]
Mark - AD7EF
[2]
Virus-free.www.avast.com [2]
Links:
------
[1]
[2]
[3] /g/DRAKE-RADIO/message/77566
[4] /mt/105892193/243852
[5] /g/DRAKE-RADIO/post
[6] /g/DRAKE-RADIO/editsub/243852
[7] /g/DRAKE-RADIO/leave/12260778/243852/767576506/xyzzy
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Karl,
I can provide a TR7 front panel casting if Gary (W0DVN) has not already helped you with this part.
Jerry, N4JL
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Karl du Roi, DK7AL via groups.io Sent: Saturday, May 4, 2024 12:51 PM To: [email protected]Subject: Re: [DRAKE-RADIO] TR7 Front Subpanel Hi Garry, I am looking for an aluminum front panel i.e. the continuous casting part behind the fancy sub-panels. Cheers. Karl, DK7AL On 04.05.24 18:43, Gary Follett wrote: Is anyone in need of a TR7 Front Subpanel? This is the panel that has all of the lettering. It is really easy to change.
I have one that has perfect lettering, great color. There is a tiny nick just below the mODE switch.
$15 plus shipping.
Gary
W0DVN
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Well that didn't help.? Back to troubleshooting.
Bob
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Installed my spare NOS relay in the L7.? Easier than I thought it would be.? The PTT connector checks out and I have both RCA plugs on my PS7 along with a isolated PTT from my 7610.? The all bus out correctly.? Now to get it back in the shack and see if it works.? Thanks.
73? Bob
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Re: OT: Coax bypass switches
To finally bring this back to a Drake discussion, I consulted
the MN-4C. It uses a four position ceramic wafer switch.
Case closed.
--lyndon
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Re: OT: Coax bypass switches
Not sure who was the originator of the question, I just joined the group.? But if the operator is looking for a mechanical switch for which to bypass an inline component such as an Antenna Tuner or maybe an Amplifier, here is one I have used in the past. ? ? I used this to bypass an amplifier when switching in older boat anchors who¡¯s output power superseded the power pass through capability of the inline amplifier.? It worked pretty well and was only one switch to flip. ? Thank you, ? Mike W5CUL ?
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From: [email protected] < [email protected]> On Behalf Of Mark Davis Sent: Saturday, May 4, 2024 1:56 PM To: [email protected]Subject: Re: [DRAKE-RADIO] OT: Coax bypass switches ? On Sat, May 4, 2024 at 06:48 AM, Robin K4IDC wrote:
Robin;
That's useful info, but I don't see any discussion of power-handling capabilities for the DIP/SMT (non-coaxial) relays. I don't believe they'd be suitable for handling 200W at 6M.
Also, for the transfer-switch functionality, where you would completely disconnect the tuner circuitry from the transmit path, you'd still need a DPDT relay or a pair of SPDT relays... or a coaxial relay something like the Dow-Key 412 series, with 4 ports (type N), and contacts arranged like this:
(see
Mark - AD7EF
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Re: OT: Coax bypass switches
On Sat, May 4, 2024 at 06:48 AM, Robin K4IDC wrote:
https://www.w6pql.com/using_inexpensive_relays.htm
Robin; That's useful info, but I don't see any discussion of power-handling capabilities for the DIP/SMT (non-coaxial) relays. I don't believe they'd be suitable for handling 200W at 6M. Also, for the transfer-switch functionality, where you would completely disconnect the tuner circuitry from the transmit path, you'd still need a DPDT relay or a pair of SPDT relays... or a coaxial relay something like the Dow-Key 412 series, with 4 ports (type N), and contacts arranged like this:  (see Mark - AD7EF
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Bob,
Not sure if it is an early L7 ?with a non-polarized 2 pin PTT connector or an RCA connector; polarization of the 2 ?pin connector is important. ? Standby/transmit switch should be checked, on the front panel of the amp. ?Too, ensure the transceiver is keying properly; a blown MOSFET could cause keying problems assuming a relay is not being used. ?Though rare, there could be a problem with the power feed to the relay.
Please keep us posted.
73,
Evan, K9SQG
On Saturday, May 4, 2024 at 01:02:04 PM EDT, K6OXN Bob <bobk6oxn@...> wrote:
After extensive troubleshooting and replacement of the tubes, now my L7 fails to key up. I have checked the keying circuit and all seems fine at this point. Could I have a bad relay in the L7?? Checked in both CW and SSB and key is getting to the relay jack on the L7. This is getting very tedious and I will wait for further assistance.? PS is working fine and interlock switches are working.? 1800 without load in CW and 2640 in SSB.? Need suggestions or guidance.
73? Bob
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After extensive troubleshooting and replacement of the tubes, now my L7 fails to key up. I have checked the keying circuit and all seems fine at this point. Could I have a bad relay in the L7?? Checked in both CW and SSB and key is getting to the relay jack on the L7. This is getting very tedious and I will wait for further assistance.? PS is working fine and interlock switches are working.? 1800 without load in CW and 2640 in SSB.? Need suggestions or guidance.
73? Bob
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Hi Garry,
I am looking for an aluminum front panel i.e. the continuous casting part behind the fancy sub-panels.
Cheers.
Karl, DK7AL
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On 04.05.24 18:43, Gary Follett wrote: Is anyone in need of a TR7 Front Subpanel? This is the panel that has all of the lettering. It is really easy to change.
I have one that has perfect lettering, great color. There is a tiny nick just below the mODE switch.
$15 plus shipping.
Gary
W0DVN
|
Is anyone in need of a TR7 Front Subpanel? This is the panel that has all of the lettering. It is really easy to change.
I have one that has perfect lettering, great color. There is a tiny nick just below the mODE switch.
$15 plus shipping.
Gary
W0DVN
|
My apologies: I didn't answer your question.? That small plastic knob simply pulls off the shaft.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, May 4th, 2024 at 10:58 AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
Yuichi, you should not need to remove the panel to fit an AM filter.? There is a socket inside the TR-6 for an AM filter.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, May 4th, 2024 at 10:16 AM, Yuichi DL1FYM <dl1fym@...> wrote:
Dear all, I wish to remove TR-6 panel for installing homemade AM crystal filter, but "Meter" knob is interfering to do so. I think TR-4 / TR-3 and perhaps T-4X are the same construction. Please give me hint how to remove the panel. Many thanks.
Yuichi?
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Yuichi, you should not need to remove the panel to fit an AM filter.? There is a socket inside the TR-6 for an AM filter.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, May 4th, 2024 at 10:16 AM, Yuichi DL1FYM <dl1fym@...> wrote:
Dear all, I wish to remove TR-6 panel for installing homemade AM crystal filter, but "Meter" knob is interfering to do so. I think TR-4 / TR-3 and perhaps T-4X are the same construction. Please give me hint how to remove the panel. Many thanks.
Yuichi?
|
Dear all, I wish to remove TR-6 panel for installing homemade AM crystal filter, but "Meter" knob is interfering to do so. I think TR-4 / TR-3 and perhaps T-4X are the same construction. Please give me hint how to remove the panel. Many thanks.
Yuichi?
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Re: OT: Coax bypass switches
Thanks, that's why I asked:
Or would having the the transmitter pass across the tuner output be a horrible idea? Ken, N2VIP On May 4, 2024, at 00:37, Mark Davis <markad7ef@...> wrote:
?On Fri, May 3, 2024 at 10:13 PM, Ken N2VIP wrote:
... Run RF out from TX to switch (common)
?
Connect a jumper from Position 1 to Tuner input
?
Connect a jumper from Posiition 2 a jumper on Tuner output where there is a T connector with one side going to the antenna system, the other back to Position 2
...
Ken; In position 2, the output side of the reactive components of the tuner remain connected between the RF output and ground. Depending on the design of the tuner, the settings of the tuner, and the transmit frequency, there are multitude of ways that circuit will affect the match between the transmitter and antenna. The tuner circuitry needs to be completely disconnected from the transmitter to antenna path. Mark - AD7EF
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Re: OT: Coax bypass switches
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Dow-Key transfer relay that can be placed anywhere and controlled from the operating position.
On Friday, May 3, 2024 at 12:53:23 PM EDT, Lyndon VE7TFX < lyndon@...> wrote:
I'm putting together a 6m tuner so I can get the TR-6
back on the air.? I want to be able to bypass the tuner,
but I have no idea what would make a suitable switch.
Anyone have a recommendation?
--lyndon
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Re: OT: Coax bypass switches
On Fri, May 3, 2024 at 10:13 PM, Ken N2VIP wrote:
... Run RF out from TX to switch (common)
?
Connect a jumper from Position 1 to Tuner input
?
Connect a jumper from Posiition 2 a jumper on Tuner output where there is a T connector with one side going to the antenna system, the other back to Position 2
...
Ken; In position 2, the output side of the reactive components of the tuner remain connected between the RF output and ground. Depending on the design of the tuner, the settings of the tuner, and the transmit frequency, there are multitude of ways that circuit will affect the match between the transmitter and antenna. The tuner circuitry needs to be completely disconnected from the transmitter to antenna path. Mark - AD7EF
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Re: OT: Coax bypass switches
I would imagine you could
Run RF out from TX to switch (common)
Connect a jumper from Position 1 to Tuner input
Connect a jumper from Posiition 2 a jumper on Tuner output where there is a T connector with one side going to the antenna system, the other back to Position 2
Connect your dummy load to position 3
Wouldn't that work? Or would having the the transmitter pass across the tuner output be a horrible idea?
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On May 3, 2024, at 23:34, Mark Davis <markad7ef@...> wrote:
?On Fri, May 3, 2024 at 08:06 PM, Lyndon VE7TFX wrote:
I've gotta say, some of the over-engineering here is pretty
spectacular :-)
I'm going to go with a 3-position ceramic wafer (dummy load,
direct, tuned).
Lyndon; It wasn't clear whether you wanted a solution you could implement inside the tuner, or with external components, and the dummy load connection is a new wrinkle I was thinking you would want to... ? a) minimize impedance mismatch and losses into and out of the tuner, when it was inline ? b) minimize impedance mismatch and losses between the transmitter and the antenna when the tuner was out of the path ? c) totally disconnect the tuner when it wasn't being used It will be challenging to accomplish any of that with a single "3-position ceramic wafer" Mark - AD7EF
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Mark Davis
Karl du Roi, DK7AL
Yuichi DL1FYM
Robin K4IDC