[Flexradio] Low recieve
I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Frank, My best guess is the preamplifier on the RFE-board. Unless the schematic diagram is not recently updated, there are protection diodes (1N4148) before the input capacitor (C47) of the amplifier, so maybe they are broken, too. You possibly can repair it yourself. See these ECOs for help: http://support.flex-radio.com/Downloads.aspx?id=102 http://support.flex-radio.com/Downloads.aspx?id=109 73, Ahti OH2RZ On 17/05/07, Frank Mayer [EMAIL PROTECTED] wrote: I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Sorry, my memory made me a trick. The protection diodes are not shown in the original schematic. They are shown only in the ECO001 and ECO025. Please, FlexRadio, update and publish the schematic diagrams of the SDR-1000. 73, Ahti OH2RZ On 17/05/07, Ahti Aintila [EMAIL PROTECTED] wrote: Frank, My best guess is the preamplifier on the RFE-board. Unless the schematic diagram is not recently updated, there are protection diodes (1N4148) before the input capacitor (C47) of the amplifier, so maybe they are broken, too. You possibly can repair it yourself. See these ECOs for help: http://support.flex-radio.com/Downloads.aspx?id=102 http://support.flex-radio.com/Downloads.aspx?id=109 73, Ahti OH2RZ On 17/05/07, Frank Mayer [EMAIL PROTECTED] wrote: I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Thanks guys. I'll check it out today! - Original Message - From: Ahti Aintila To: Frank Mayer Cc: flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 4:29 AM Subject: Re: [Flexradio] Low recieve Frank, My best guess is the preamplifier on the RFE-board. Unless the schematic diagram is not recently updated, there are protection diodes (1N4148) before the input capacitor (C47) of the amplifier, so maybe they are broken, too. You possibly can repair it yourself. See these ECOs for help: http://support.flex-radio.com/Downloads.aspx?id=102 http://support.flex-radio.com/Downloads.aspx?id=109 73, Ahti OH2RZ On 17/05/07, Frank Mayer [EMAIL PROTECTED] wrote: I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/011b846a/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
[Flexradio] I dug out a serial/parallel
Card out of my pile of 'stuff'. Consequently I now have a 'extra' com port: com 2 and A Parallel port: LPT1 Which is better, the USB to parallel interface or the actual LPT1 cable? And...how can I use the com port to better SDR? - The Blues Brothers - Bill H. in Chicagoland webcams at http://76.16.160.118:8080/ weather at http://hhweather.webhop.org ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Re: [Flexradio] Low recieveI called Ken at Flex and he referred me to Ed at Flex service and he walked me thru the RFE board and we determined that the RF amp IC was bad. They are sending one right out to me. Great service! Great radio! You gotta love it! Thanks guys! Frank, WA3JBT - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 5:54 AM Subject: RE: [Flexradio] Low recieve It might be usefull to check if the relay contacts on the input of the RF preamp are still OK (if the diodes are damaged) good luck 73 de peter pa0pvn groeten Peter petervn(a)hetnet.nl ; pa0pvn(a)hetnet.nl ; pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org . -- Van: [EMAIL PROTECTED] namens Gerd Loch Verzonden: do 17-5-2007 11:52 Aan: 'Frank Mayer'; flexradio@flex-radio.biz Onderwerp: Re: [Flexradio] Low recieve Hi Frank, besides the protection diodes and the preamplifier itself (as stated by Ahti) the next sensitive circuit is the switch FST3252M (IC1). You can check if the bias dc-voltage (2,5V) can be measured at the output pins. 73 Gerd, DJ8AY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Frank Mayer Sent: Thursday, May 17, 2007 9:36 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Low recieve I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20 070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/3478708a/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Frank, That's been my experience as well (with the few minor issues I've had.) I also appreciate seeing these questions posted to the the list and all the valuable suggestions. Thanks for posting the question and the outcome. Mark -Original Message- From: Frank Mayer [mailto:[EMAIL PROTECTED] Sent: Thursday, May 17, 2007 10:58 AM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Low recieve Re: [Flexradio] Low recieveI called Ken at Flex and he referred me to Ed at Flex service and he walked me thru the RFE board and we determined that the RF amp IC was bad. They are sending one right out to me. Great service! Great radio! You gotta love it! Thanks guys! Frank, WA3JBT - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 5:54 AM Subject: RE: [Flexradio] Low recieve It might be usefull to check if the relay contacts on the input of the RF preamp are still OK (if the diodes are damaged) good luck 73 de peter pa0pvn groeten Peter petervn(a)hetnet.nl ; pa0pvn(a)hetnet.nl ; pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org . -- Van: [EMAIL PROTECTED] namens Gerd Loch Verzonden: do 17-5-2007 11:52 Aan: 'Frank Mayer'; flexradio@flex-radio.biz Onderwerp: Re: [Flexradio] Low recieve Hi Frank, besides the protection diodes and the preamplifier itself (as stated by Ahti) the next sensitive circuit is the switch FST3252M (IC1). You can check if the bias dc-voltage (2,5V) can be measured at the output pins. 73 Gerd, DJ8AY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Frank Mayer Sent: Thursday, May 17, 2007 9:36 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Low recieve I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20 070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/3478708a/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/2cdd85a0/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Hi Frank, To protect the receiver of my SDR1000 I stalled ahead of the RF-amplifier a microgap surge absorber element in discharge tube. See the below link. http://www.koaproducts.com/english/catalogue/sa.htm It may be the right opportunity to install one of these when you unpile the board stack of the SDR1000 for repair. gl de SM6OMH Willi - Original Message - From: Frank Mayer [EMAIL PROTECTED] To: flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 12:35 AM Subject: [Flexradio] Low recieve I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Willi and Frank, The DC Spark-Over Voltage of SA05-C-T52-A-301-M is specified 200V±20% and typically the max. device voltage of the preamps is as low as 5-6V. A properly located microgap surge absorber may prevent big disasters, but still for low voltage transients protective diodes will be needed, too. 73, Ahti OH2RZ On 17/05/07, Willi Reppel [EMAIL PROTECTED] wrote: Hi Frank, To protect the receiver of my SDR1000 I stalled ahead of the RF-amplifier a microgap surge absorber element in discharge tube. See the below link. http://www.koaproducts.com/english/catalogue/sa.htm It may be the right opportunity to install one of these when you unpile the board stack of the SDR1000 for repair. gl de SM6OMH Willi - Original Message - From: Frank Mayer [EMAIL PROTECTED] To: flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 12:35 AM Subject: [Flexradio] Low recieve ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Frank et all, Here is are a couple of inexpensive devices that I use. I.C.E. makes some great products and they are of the highest quality. http://www.iceradioproducts.com/impulse1.html#1 (transmission lines) http://www.iceradioproducts.com/reconly.html#rflimiter (receiver input only) Saved my bacon a few times! --Larry W8ER Frank Mayer wrote: Re: [Flexradio] Low recieveI called Ken at Flex and he referred me to Ed at Flex service and he walked me thru the RFE board and we determined that the RF amp IC was bad. They are sending one right out to me. Great service! Great radio! You gotta love it! Thanks guys! Frank, WA3JBT - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 5:54 AM Subject: RE: [Flexradio] Low recieve It might be usefull to check if the relay contacts on the input of the RF preamp are still OK (if the diodes are damaged) good luck 73 de peter pa0pvn groeten Peter petervn(a)hetnet.nl ; pa0pvn(a)hetnet.nl ; pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org . -- Van: [EMAIL PROTECTED] namens Gerd Loch Verzonden: do 17-5-2007 11:52 Aan: 'Frank Mayer'; flexradio@flex-radio.biz Onderwerp: Re: [Flexradio] Low recieve Hi Frank, besides the protection diodes and the preamplifier itself (as stated by Ahti) the next sensitive circuit is the switch FST3252M (IC1). You can check if the bias dc-voltage (2,5V) can be measured at the output pins. 73 Gerd, DJ8AY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Frank Mayer Sent: Thursday, May 17, 2007 9:36 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Low recieve I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20 070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/3478708a/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Ahti and Frank, Sorry, I did not mention that I installed the microgap absorber between antenna input of the RFE board and said voltage transients protective diode on the RFE board. I think nowadays new SDR1000 are already equipped with these diodes while I had to add them according to ECO 001. Remains to be seen how Flexradio protects the SDR 5000 investors against transients. gl es gn de SM6OMH Willi - Original Message - From: Ahti Aintila [EMAIL PROTECTED] To: Willi Reppel [EMAIL PROTECTED] Cc: Frank Mayer [EMAIL PROTECTED]; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 11:22 AM Subject: Re: [Flexradio] Low recieve Willi and Frank, The DC Spark-Over Voltage of SA05-C-T52-A-301-M is specified 200V±20% and typically the max. device voltage of the preamps is as low as 5-6V. A properly located microgap surge absorber may prevent big disasters, but still for low voltage transients protective diodes will be needed, too. 73, Ahti OH2RZ On 17/05/07, Willi Reppel [EMAIL PROTECTED] wrote: Hi Frank, To protect the receiver of my SDR1000 I stalled ahead of the RF-amplifier a microgap surge absorber element in discharge tube. See the below link. http://www.koaproducts.com/english/catalogue/sa.htm It may be the right opportunity to install one of these when you unpile the board stack of the SDR1000 for repair. gl de SM6OMH Willi - Original Message - From: Frank Mayer [EMAIL PROTECTED] To: flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 12:35 AM Subject: [Flexradio] Low recieve ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
Point of information: My Preamp IC was blown and the protective diodes are still good. I think the diodes are designed to protect against strong RF signals not lightning related atmospheric static. - Original Message - From: Willi Reppel To: Ahti Aintila Cc: Frank Mayer ; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 3:44 PM Subject: Re: [Flexradio] Low recieve Ahti and Frank, Sorry, I did not mention that I installed the microgap absorber between antenna input of the RFE board and said voltage transients protective diode on the RFE board. I think nowadays new SDR1000 are already equipped with these diodes while I had to add them according to ECO 001. Remains to be seen how Flexradio protects the SDR 5000 investors against transients. gl es gn de SM6OMH Willi - Original Message - From: Ahti Aintila [EMAIL PROTECTED] To: Willi Reppel [EMAIL PROTECTED] Cc: Frank Mayer [EMAIL PROTECTED]; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 11:22 AM Subject: Re: [Flexradio] Low recieve Willi and Frank, The DC Spark-Over Voltage of SA05-C-T52-A-301-M is specified 200V±20% and typically the max. device voltage of the preamps is as low as 5-6V. A properly located microgap surge absorber may prevent big disasters, but still for low voltage transients protective diodes will be needed, too. 73, Ahti OH2RZ On 17/05/07, Willi Reppel [EMAIL PROTECTED] wrote: Hi Frank, To protect the receiver of my SDR1000 I stalled ahead of the RF-amplifier a microgap surge absorber element in discharge tube. See the below link. http://www.koaproducts.com/english/catalogue/sa.htm It may be the right opportunity to install one of these when you unpile the board stack of the SDR1000 for repair. gl de SM6OMH Willi - Original Message - From: Frank Mayer [EMAIL PROTECTED] To: flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 12:35 AM Subject: [Flexradio] Low recieve -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/807 - Release Date: 5/16/2007 6:05 PM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/3e286afb/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low recieve
At 12:44 PM 5/17/2007, Willi Reppel wrote: Ahti and Frank, Sorry, I did not mention that I installed the microgap absorber between antenna input of the RFE board and said voltage transients protective diode on the RFE board. I think nowadays new SDR1000 are already equipped with these diodes while I had to add them according to ECO 001. Remains to be seen how Flexradio protects the SDR 5000 investors against transients. There's always a tradeoff in transient suppression. Putting diodes in the front puts a capacitance across the input as well as possibly a source of intermods. A spark gap like device can also actually induce transients in the victim circuitry. Imagine a spark gap across a section of openwire line. A transient comes down one side, the sparkgap fires and shorts, with the resultant current spike flowing in the source side of the line, thru the gap, and back out the source line. That current creates a magnetic field which induces a voltage in any other loop near by, including that formed by the receiver input, the two wires in the line, and the (now shorted) sparkgap. I don't have the part number handy, but there are semiconductor transient suppression devices specifically intended for this sort of application with a fairly low threshold voltage, very low parasitic C, and a I/V characteristic designed to minimize IMD. There's also all sorts of subtleties of interconnecting multiple transient suppression devices. For instance, on the AC line, if you have a 250V suppressor at the service entrance and a 170V suppressor on a plug strip, the low energy, low voltage suppressor will protect the big, high energy, higher voltage suppressor by firing (and failing) first. This is without considering all the stray path and transmission line effects. ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] [hpsdr] See you at Dayton!
Dayton, Ohio, is on Eastern Daylight Savings Time, UTC -4 hours (add 4 hours for Zulu time). I will record and post to HamSDR.com, as long as my Internet connection and PC keep working. Eric Ellison wrote: * High Performance Software Defined Radio Discussion List * Guys here are some of the SDR going’s on at Dayton . Look forward to seeing you there! Eric – AA4SW TeamSpeak BroadcastSchedule TAPR Forum on Friday (Pending the confirmation of Internet connectivity) SDR Forum on Saturday from 8:00 AM to 11:00 AM (Pending the confirmation of Internet connectivity) FlexRadio Informal Evening Meeting on Saturday at 8:00 PM EDT (For sure ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] Low receive
I second the vote for ICE lightning arrestors and static discharge units. I live in a lightning prone area (the house across the street has been hit twice). During a bad storm last year I ended up with a cooked 300U and a perfectly good working Pro II. It is the best insurance I have ever bought! -Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Larry W8ER Sent: Thursday, May 17, 2007 2:43 PM To: Frank Mayer Cc: flexradio@flex-radio.biz Subject: Re: [Flexradio] Low recieve Frank et all, Here is are a couple of inexpensive devices that I use. I.C.E. makes some great products and they are of the highest quality. http://www.iceradioproducts.com/impulse1.html#1 (transmission lines) http://www.iceradioproducts.com/reconly.html#rflimiter (receiver input only) Saved my bacon a few times! --Larry W8ER Frank Mayer wrote: Re: [Flexradio] Low recieveI called Ken at Flex and he referred me to Ed at Flex service and he walked me thru the RFE board and we determined that the RF amp IC was bad. They are sending one right out to me. Great service! Great radio! You gotta love it! Thanks guys! Frank, WA3JBT - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz Sent: Thursday, May 17, 2007 5:54 AM Subject: RE: [Flexradio] Low recieve It might be usefull to check if the relay contacts on the input of the RF preamp are still OK (if the diodes are damaged) good luck 73 de peter pa0pvn groeten Peter petervn(a)hetnet.nl ; pa0pvn(a)hetnet.nl ; pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org . -- Van: [EMAIL PROTECTED] namens Gerd Loch Verzonden: do 17-5-2007 11:52 Aan: 'Frank Mayer'; flexradio@flex-radio.biz Onderwerp: Re: [Flexradio] Low recieve Hi Frank, besides the protection diodes and the preamplifier itself (as stated by Ahti) the next sensitive circuit is the switch FST3252M (IC1). You can check if the bias dc-voltage (2,5V) can be measured at the output pins. 73 Gerd, DJ8AY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Frank Mayer Sent: Thursday, May 17, 2007 9:36 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Low recieve I have had my SDR for about 6 months now and last night night it was subjected to a static discharge during a thunderstorm. Not a direct hit but enough to affect the receiver. Now it has very low sensitivity. Are there any known causes for this (blown diodes or RF amp transistor in the front end)? Or does it need factory repair. Frank WA3JBT -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20 070517/386eda1e/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20070517/3478708a/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http
[Flexradio] SDR rig control Cat interface
I'm slowly making progress. I am using a SIIG combo card to provide the LPT address of DCB8 onto the parallel port. My microHAM keyer sends cw to both the SDR and the Yaesu. (not at the same time) I have the ptt pins on the SDR enabled to apply PTT to my amp. And I have the SDR CAT enabled. So now my DXBase software recognizes two radios in sort of a POOR MANS SO2R system. Radio 1 is the Yaesu on Com3 (virtual com port from the micrhoHAM system) Radio 2 is the SDR (emulating a TS2000 on Com 16 which is using VCom virtual 616 pair. By selecting which radio icon in DXBase, I can enter a call that I work and it will poll the Yaesu or SDR and enter the freq, mode etc. But here comes the cat problem. While DXBase will allow me to to go to it's cluster window, and click on a spot which will qsy the Yaesu to that freq/mode. I can't do it with the SDR. Dxbase can read/decode what frequency/mode the SDR is in. But it can't tell SDR to switch modes and/or go to the frequency of the QSY command. In DXBase I have TS2000, Com 16, 4800, 8 no Parity and 1 stop bit. Either the SDR or DXBase has the wrong command set for the TS2000??? I'm betting that I may have corrupted my TS2000 DXbase Command set. - If you tell the truth you don't have to remember anything. - Bill H. in Chicagoland webcams at http://76.16.160.118:8080/ weather at http://hhweather.webhop.org ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
Re: [Flexradio] SDR rig control Cat interface
What I've found here is DXBase and SDR lose communication with the com port. Portmon is a free utility that will monitor com port activity. It shows here that the com port closes after a short time. Dxbase can read/decode what frequency/mode the SDR is in. But it can't tell SDR to switch modes and/or go to the frequency of the QSY command. In DXBase I have TS2000, Com 16, 4800, 8 no Parity and 1 stop bit. -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070517/864101fd/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
