Re: To TX on SSB any Frequency FM works fine
Hi Nils, ? Thank you very much this compares to my readings, it is odd not to see the AF output on pin2, but it is there further up the food chain on the input to the balanced modulator ? 73 ? Andrew ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Nils Ostman
Sent: 06 March 2022 13:54
To: [email protected]
Subject: Re: [YaesuFT847] To TX on SSB any Frequency FM works fine ? Hi,
I did a brief check on a working 847:
Q 1053
Pin 1? ?3.8
Pin 2? ?1.9
Pin 3? ?3 - 5 depending on mic gain
Pin 4? ?3.9
Pin 5? ?gnd
Pin 6? ?nc
Pin 7? 3.8
Pin 8? ?4.2
Pin 9? 3.7
Pin 10 7.6
Measured? with a Fluke.
The LF level on pin2 (out) and pin4 (in) are about the same with the mic gain i middle position.
/Nils
SM7DVO
|
Re: To TX on SSB any Frequency FM works fine
Hi,
I did a brief check on a working 847:
Q 1053
Pin 1? ?3.8
Pin 2? ?1.9
Pin 3? ?3 - 5 depending on mic gain
Pin 4? ?3.9
Pin 5? ?gnd
Pin 6? ?nc
Pin 7? 3.8
Pin 8? ?4.2
Pin 9? 3.7
Pin 10 7.6
Measured? with a Fluke.
The LF level on pin2 (out) and pin4 (in) are about the same with the mic gain i middle position.
/Nils
SM7DVO
|
Re: To TX on SSB any Frequency FM works fine
Adding circuit tat was cut off I
have also added some voltage for Q1063: Pin 1, Pin 3.8V 2, 1.8 Volt, Pin 3, 3.6-4.8V (mic gain control range) Pin4 3.7V Pin 5 earth, Pin6 NC, Pin7 3.7V, Pin 8 4.2V Pin 9 3.6V Pin 10 7.4V?
Pin 2 seems low which is the audio out on the current mirror circuit, but nothing is coming out!
73
Andrew
|
To TX on SSB any Frequency FM works fine
My basic problem is I seem to have lost Mic audio after Q1053 there is nothing coming out of Pin 4. Pin 4 travels half way around the radio and ends up at Q1038 Pin 6. Q1053 is an electronic attenuator controlled by Pin 3, this does move up and down with the mic gain control.
?
If I switch the monitor on I hear my Mic audio coming out the speaker, so this obviously takes another path. Not sure where. There are no voltages or waveforms on the technical supplement, so I have no of knowing what is normal.
?
?
The output of IC Q1063 ends up on Pin 12 on IC 1C1081 (switch) ?which in accessible on the top side of the AF board. The Voltage levels on Q1053 would also be useful, if you can get there and measure them.
?
Is there any way anyone could scope a working model and let me know if audio is getting through and roughly the levels? This way I know roughly where my fault lies?
73 Andrew G8UUG
?
|
Updating batter for battery! ? ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Carl KO4SSA via groups.io
Sent: 05 March 2022 12:53
To: [email protected]
Subject: Re: [YaesuFT847] new, hello? No, does not have 4 meter mod. The resistors on the board don’t seem to be 0 ohm, they’re 1 ohm. ?Have others found this? ?All documentation I can find says it doesn’t matter.?
On Feb 26, 2022, at 10:01 AM, Andrew Lenton <a@...> wrote: ? I have enclosed a pic of mine TX ?1.8 to 70 140 to 174 420 to 470 MHz I removed the battery for better pic Avoid Transmitting 30 to 40 MHz as the HF low pass filter will heat up and burn at 100 Watts Does your Japan Model have the 4M UK Mod or not? Also try 111010.?
It seems there are different configurations , and possibly conflicting evidence.?
I doubt if Yaesu would make a custom IC, just for JA market On Fri, 25 Feb 2022 at 21:36, Carl KO4SSA via??<cbeaudette99=[email protected]> wrote: press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error" On Feb 25, 2022, at 2:47 PM, Andy Bosworth <sidthepop@...> wrote: On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via??<cbeaudette99=[email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.??
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
? This email has been scanned by BullGuard antivirus protection. <20220226_145618.jpg> ?
|
1 OHM is fine, a link and 1 Ohm in this instance is the same thing, probably work fine up to 470 ohm? ? 73 ? Andrew ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Carl KO4SSA via groups.io
Sent: 05 March 2022 12:53
To: [email protected]
Subject: Re: [YaesuFT847] new, hello? No, does not have 4 meter mod. The resistors on the board don’t seem to be 0 ohm, they’re 1 ohm. ?Have others found this? ?All documentation I can find says it doesn’t matter.?
On Feb 26, 2022, at 10:01 AM, Andrew Lenton <a@...> wrote: ? I have enclosed a pic of mine TX ?1.8 to 70 140 to 174 420 to 470 MHz I removed the batter for better pic Avoid Transmitting 30 to 40 MHz as the HF low pass filter will heat up and burn at 100 Watts Does your Japan Model have the 4M UK Mod or not? Also try 111010.?
It seems there are different configurations , and possibly conflicting evidence.?
I doubt if Yaesu would make a custom IC, just for JA market On Fri, 25 Feb 2022 at 21:36, Carl KO4SSA via??<cbeaudette99=[email protected]> wrote: press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error" On Feb 25, 2022, at 2:47 PM, Andy Bosworth <sidthepop@...> wrote: On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via??<cbeaudette99=[email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.??
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
? This email has been scanned by BullGuard antivirus protection. <20220226_145618.jpg> ?
|
No, does not have 4 meter mod.
The resistors on the board don’t seem to be 0 ohm, they’re 1 ohm. ?Have others found this? ?All documentation I can find says it doesn’t matter.?
toggle quoted message
Show quoted text
On Feb 26, 2022, at 10:01 AM, Andrew Lenton < a@...> wrote:
I have enclosed a pic of mine TX ?1.8 to 70 140 to 174 420 to 470 MHz I removed the batter for better pic ? ? Avoid Transmitting 30 to 40 MHz as the HF low pass filter will heat up and burn at 100 Watts ? Does your Japan Model have the 4M UK Mod or not? ? 73 ? Andrew ? ? ? Also try 111010.?
It seems there are different configurations , and possibly conflicting evidence.?
I doubt if Yaesu would make a custom IC, just for JA market ? On Fri, 25 Feb 2022 at 21:36, Carl KO4SSA via ??<cbeaudette99= [email protected]> wrote: nope, still get “error” press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error"
On Feb 25, 2022, at 2:47 PM, Andy Bosworth < sidthepop@...> wrote: ? On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 ? On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via ??<cbeaudette99= [email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.??
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
?
This email has been scanned by BullGuard antivirus protection. For more info visit? <20220226_145618.jpg>
|
Dear Owners, took delivery of the parts on Saturday and took some time out to fit them today and can report after gutting all the burnt carbon and working the board. New components are in and following Andrews advice set TC1001 to null while checking the other test points.
SWR is 1.02:1 on nearly all bands into a Comet H422 at 3 meters (my test antenna). Working well.
Thanks to everyone who participated and hope I can return the favour in the future.
See the repair which was challenging and used non conductive glue to stick down the core and prevent it moving.
Before
After
I know the board still looks burned but it’s back to good FR4 I assure you. The photo doesn’t do it justice.
73 and hope to catch you all in my log soon.
De Spence M0STO
Sent while portable! please excuse typos.
|
I have enclosed a pic of mine TX ?1.8 to 70 140 to 174 420 to 470 MHz I removed the batter for better pic ? ? Avoid Transmitting 30 to 40 MHz as the HF low pass filter will heat up and burn at 100 Watts ? Does your Japan Model have the 4M UK Mod or not? ? 73 ? Andrew ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Andy Bosworth
Sent: 26 February 2022 00:01
To: [email protected]
Subject: Re: [YaesuFT847] new, hello? Also try 111010.?
It seems there are different configurations , and possibly conflicting evidence.?
I doubt if Yaesu would make a custom IC, just for JA market ? On Fri, 25 Feb 2022 at 21:36, Carl KO4SSA via <cbeaudette99=[email protected]> wrote: nope, still get “error” press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error"
On Feb 25, 2022, at 2:47 PM, Andy Bosworth <sidthepop@...> wrote: ? On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 ? On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via <cbeaudette99=[email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.?
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
?
This email has been scanned by BullGuard antivirus protection.
For more info visit
|
Also try 111010.? It seems there are different configurations , and possibly conflicting evidence.? I doubt if Yaesu would make a custom IC, just for JA market
On Fri, 25 Feb 2022 at 21:36, Carl KO4SSA via <cbeaudette99= [email protected]> wrote: nope, still get “error”
(after setting jumpers: press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error" On Feb 25, 2022, at 2:47 PM, Andy Bosworth < sidthepop@...> wrote:
On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via <cbeaudette99= [email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.?
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
|
nope, still get “error”
(after setting jumpers: press FAST and LOCK, and power up, menu 39 ALL INIT, press MCK/W, Try TX on 144 MHz ?—> ?works Try TX on 147 MHz —> “error"
toggle quoted message
Show quoted text
On Feb 25, 2022, at 2:47 PM, Andy Bosworth < sidthepop@...> wrote:
On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450 On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via <cbeaudette99= [email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.?
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
|
tried 110001, no work. ? Yaesu document says that jumpers 7-9 should be open. ?Where are these? I don’t see jumpers 7-9 labeled on the PCB.
( After setting jumpers: fast-lock pressed, power on,? menu 39 —> mock/w try tx on 147.0 MHz ? )
toggle quoted message
Show quoted text
On Feb 25, 2022, at 2:50 PM, Andrew Lenton < a@...> wrote:
Hi here you go
733
Andrew G8UUG
<FT 847mod by Yeasu.pdf>
|
Hi here you go
733
Andrew G8UUG
|
Here you go
73 Andrew
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Carl KO4SSA via groups.io Sent: 25 February 2022 19:10 To: [email protected]Subject: [YaesuFT847] new, hello Hi FT-847 fans!! This is Carl, KO4SSA. I just purchased a used 847 on eBay, from Japan. I’m wondering how to modify for US bands. As delivered only TX 144-146 and 430-440. I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!! Haven’t heard back. I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up. Is the Japan stuff transmit range burned into EPROM or something???? Colin lists several HF coverage configurations and I am able to transmit on 14.550!! (into dummy load of course) I point out as evidence that changing the solder jumpers did do SOMETHING. Also, initially the cross-band repeater item was not available on the menu and now it appeared. More evidence that changing the jumpers did something. Thanks Carl This email has been scanned by BullGuard antivirus protection. For more info visit www.bullguard.com
|
On the jumpers try 101011 by jumper number, do? reset after.?
Should give HF coverage, 144-148 and 430 -450
On Fri, 25 Feb 2022 at 19:32, Carl KO4SSA via <cbeaudette99= [email protected]> wrote: Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan.? I’m wondering how to modify for US bands.? As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!!? Haven’t heard back.?
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up.? Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!!? (into dummy load of course)? I point out as evidence that changing the solder jumpers did do SOMETHING.? Also, initially the cross-band repeater item was not available on the menu and now it appeared.? More evidence that changing the jumpers did something.
Thanks Carl
|
Hi this is very straight forward let me dig out the info for
73
Andrew
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Carl KO4SSA via groups.io Sent: 25 February 2022 19:10 To: [email protected]Subject: [YaesuFT847] new, hello Hi FT-847 fans!! This is Carl, KO4SSA. I just purchased a used 847 on eBay, from Japan. I’m wondering how to modify for US bands. As delivered only TX 144-146 and 430-440. I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!! Haven’t heard back. I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up. Is the Japan stuff transmit range burned into EPROM or something???? Colin lists several HF coverage configurations and I am able to transmit on 14.550!! (into dummy load of course) I point out as evidence that changing the solder jumpers did do SOMETHING. Also, initially the cross-band repeater item was not available on the menu and now it appeared. More evidence that changing the jumpers did something. Thanks Carl This email has been scanned by BullGuard antivirus protection. For more info visit www.bullguard.com
|
Hi FT-847 fans!!
This is Carl, KO4SSA.
I just purchased a used 847 on eBay, from Japan. I’m wondering how to modify for US bands. As delivered only TX 144-146 and 430-440.
I’ve searched high and low on the the web, including Colin, G1IVG’s page, and emailed him!! Haven’t heard back.
I’ve tried several solder joint configurations and will not TX on 146.52 or 445000. About to give up. Is the Japan stuff transmit range burned into EPROM or something????
Colin lists several HF coverage configurations and I am able to transmit on 14.550!! (into dummy load of course) I point out as evidence that changing the solder jumpers did do SOMETHING. Also, initially the cross-band repeater item was not available on the menu and now it appeared. More evidence that changing the jumpers did something.
Thanks Carl
|
|
|
I can have RS deliver anywhere, I was just checking you were no 20 miles away! ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Spence M0STO via groups.io
Sent: 23 February 2022 21:14
To: [email protected]
Subject: Re: [YaesuFT847] Yaesu FC20? Hi Andrew, I live in Stanford Le Hope, Essex and my nearest branch was Bow, Maverton way but that has long shut. I think my nearest is in South London but I always order online these days. ? De Spence M0STO? Sent while portable! please excuse typos.
On 23 Feb 2022, at 20:50, Andrew Lenton <a@...> wrote:
I have a business account with RS where do you live ? 73 ? Andrew ? ? Hi Andrew, I’ve got a good stock of BAT46 and BAT85’s (used in the FT847) so thank you for the offer. ? Fortunately I have a few decent SWR meters and 50w and 100w elements and also aware of the shortcomings of the thruline so thanks for the heads up. I have two bird meters so easy to put a 50H element in reverse and 100H in forward. ? The good news is the tuner still works as expected. It still tunes on all bands! As strange as it sounds the processor isn’t affected as far as I can tell but it is in direct connection to the null adjustment circuit however some protection exists. ? I’ve put in a small order with Yaesu as mentioned so just waiting for that confirmation.?
Will keep you updated. Also noticed the gas discharge tube on the tuning board looks a little smokey. Not put a meter on it yet and doubt it’s taken a hit but they are available from RS Components for about ?6 and I’m a business customer so no postage fortunately otherwise this would start becoming a small but very expensive repair when compared to the cost of a second user ?tuner.? ? Many thanks and please keep the thread going guys as the information so far is absolutely dynamite. It’s really appreciated. The very kindest regards, De Spence M0STO? Sent while portable! please excuse typos.
On 23 Feb 2022, at 15:54, Andrew Lenton <a@...> wrote:
Hi if you used a Bird through line, make sure the element power is low i.e. 50 Watts when using on reflected, as most SWR meters have a more sensitive scale on reflected! The Bird is the same scale in reverse, unless you change to a lower powered element, if you se what I am getting at, That is a bad burn up I suspect it was more than 100 Watts into an open circuit, lets hope the process or is still with us and the board is not too damaged. Bird is ideal for return loss, but not for a low SWR.
Change the Diodes to BAT46, I have some here I can make a matched pair for you
73
Andrew G8UUG in Hampshire
|
Good morning, for those who are following this post and interested in the cure? Here are some snaps of the good working FC-20 I also own (this is like new inside).
Here is a list of the components I’m replacing and the associated Yaesu part numbers.
TC1001??????????? K91000029????? TRIMMER CAP. ECV1ZW20X53T C1057 ???????????? K26270045? ? ? 200PF 500WV CERAMIC CAPACITOR D1008? ??????????? G2090244?????? DIODE? ISS106-E L1035 ??????????? L1790164??????? M.RFC LAL03VB102K R1053 ???????????? J07225270?????? CARBON FILM RES. RD16TPJ270 R1054 ???????????? J07225270?????? CARBON FILM RES. RD16TPJ270
Hope this helps anyone with similar issues.
Regards,
Sent while portable! please excuse typos. Hi Andrew, I live in Stanford Le Hope, Essex and my nearest branch was Bow, Maverton way but that has long shut. I think my nearest is in South London but I always order online these days.
? De Spence M0STO? Sent while portable! please excuse typos. On 23 Feb 2022, at 20:50, Andrew Lenton < a@...> wrote: I have a business account with RS where do you live ? 73 ? Andrew ? ? Hi Andrew, I’ve got a good stock of BAT46 and BAT85’s (used in the FT847) so thank you for the offer. ? Fortunately I have a few decent SWR meters and 50w and 100w elements and also aware of the shortcomings of the thruline so thanks for the heads up. I have two bird meters so easy to put a 50H element in reverse and 100H in forward. ? The good news is the tuner still works as expected. It still tunes on all bands! As strange as it sounds the processor isn’t affected as far as I can tell but it is in direct connection to the null adjustment circuit however some protection exists. ? I’ve put in a small order with Yaesu as mentioned so just waiting for that confirmation.?
Will keep you updated. Also noticed the gas discharge tube on the tuning board looks a little smokey. Not put a meter on it yet and doubt it’s taken a hit but they are available from RS Components for about ?6 and I’m a business customer so no postage fortunately otherwise this would start becoming a small but very expensive repair when compared to the cost of a second user ?tuner.? ? Many thanks and please keep the thread going guys as the information so far is absolutely dynamite. It’s really appreciated. The very kindest regards, De Spence M0STO? Sent while portable! please excuse typos.
On 23 Feb 2022, at 15:54, Andrew Lenton <a@...> wrote:
Hi if you used a Bird through line, make sure the element power is low i.e. 50 Watts when using on reflected, as most SWR meters have a more sensitive scale on reflected! The Bird is the same scale in reverse, unless you change to a lower powered element, if you se what I am getting at, That is a bad burn up I suspect it was more than 100 Watts into an open circuit, lets hope the process or is still with us and the board is not too damaged. Bird is ideal for return loss, but not for a low SWR.
Change the Diodes to BAT46, I have some here I can make a matched pair for you
73
Andrew G8UUG in Hampshire
|
Andrew Lenton
Nils Ostman
Spence G5STO
Andy Bosworth