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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+Hi\s+Z\s+amplifiers\s+for\s+160m\s*$/: 38 ]

Total 38 documents matching your query.

1. Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Wed, 11 Mar 2020 11:33:34 +0000
As well as being a radio amateur (G4HYG) I also run a small business designing and making radio equipment (Cross Country Wireless). Recently I've been asked by a radio contest group to see if I can r
/archives//html/Topband/2020-03/msg00109.html (7,425 bytes)

2. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Wed, 11 Mar 2020 09:28:44 -0400
Chris, Assuming a trans-impedance amplifier, "unity gain" is enough (with reasonable size elements). Noise and IP3 are far more important. Lightning and surge immunity are also important. Also, isola
/archives//html/Topband/2020-03/msg00110.html (8,316 bytes)

3. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: RT Clay <rt_clay@bellsouth.net>
Date: Wed, 11 Mar 2020 15:11:32 +0000 (UTC)
Chris, I just finished making my own set of amplifiers derived from the YCCC design but using SMD components. I used an AD8045 (SOIC-8 size) instead of the 8055 and added a voltage regulator. They ha
/archives//html/Topband/2020-03/msg00111.html (9,185 bytes)

4. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Lee STRAHAN <k7tjr@msn.com>
Date: Wed, 11 Mar 2020 17:17:23 +0000
Greetings all, George has some very pertinent points here and only on one point I will disagree. What a Hi-Z amplifier needs to do is dependent on your aspirations of the size and quantity of element
/archives//html/Topband/2020-03/msg00112.html (11,120 bytes)

5. Topband: Hi Z amplifiers for 160m (score: 1)
Author: DXer <hfdxmonitor@gmail.com>
Date: Wed, 11 Mar 2020 13:33:08 -0400
Can you point to a place that sells them. I became a 'fan' of F termination, but have recently had second thoughts because of the bulkhead connector's quality. Thanks and 73. Vince, VA3VF __________
/archives//html/Topband/2020-03/msg00113.html (7,717 bytes)

6. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 11 Mar 2020 10:34:52 -0700
On 3/11/2020 6:28 AM, GEORGE WALLNER wrote: Assuming a trans-impedance amplifier, "unity gain" is enough (with reasonable size elements). Noise and IP3 are far more important. Lightning and surge imm
/archives//html/Topband/2020-03/msg00114.html (8,446 bytes)

7. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Lee STRAHAN <k7tjr@msn.com>
Date: Wed, 11 Mar 2020 17:37:01 +0000
Mouser 601- 25-7630 or 601-25-7660 [Lee K7TJR] Can you point to a place that sells them. I became a 'fan' of F termination, but have recently had second thoughts because of the bulkhead connector's q
/archives//html/Topband/2020-03/msg00115.html (8,075 bytes)

8. Topband: Hi Z amplifiers for 160m (score: 1)
Author: DXer <hfdxmonitor@gmail.com>
Date: Wed, 11 Mar 2020 13:49:34 -0400
redesign the YCCC Hi Z amplifier using modern components and using similar mounting arrangements to our Loop Antenna Amplifier. Hi Chris, Any updates on the loop antenna amplifier revisions you were
/archives//html/Topband/2020-03/msg00116.html (7,433 bytes)

9. Topband: Hi Z amplifiers for 160m (score: 1)
Author: DXer <hfdxmonitor@gmail.com>
Date: Wed, 11 Mar 2020 14:07:10 -0400
Thank you very much, Lee. My last Mouser order arrived...today! On the list for the next order. LOL 73 de Vince, VA3VF _________________ Searchable Archives: http://www.contesting.com/_topband - Top
/archives//html/Topband/2020-03/msg00117.html (7,774 bytes)

10. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Wed, 11 Mar 2020 18:31:25 +0000
Thanks for all the very helpful replies and suggestions. I'll change the BNC connector to a 4 hole F connector with 75 ohm output. The design already has a 20 kA gas discharge tube and DC biased diod
/archives//html/Topband/2020-03/msg00118.html (8,280 bytes)

11. Topband: Hi Z amplifiers for 160m (score: 1)
Author: DXer <hfdxmonitor@gmail.com>
Date: Wed, 11 Mar 2020 15:19:59 -0400
limiter for lightning and surge protection. It also has an optional (by internal link) diode limiter on the output so that it can be used by "weak" SDR receivers such as the SDRPlay RSP series that
/archives//html/Topband/2020-03/msg00120.html (7,978 bytes)

12. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: "Lloyd - N9LB" <lloydberg@tds.net>
Date: Wed, 11 Mar 2020 17:23:52 -0500
Lee, Can you recommend an improved device to replace/upgrade the Analog Devices # AD8055AN chip? Any chance it would be a "drop-in replacement" ( pin-for-pin ) ? I've got nine of the YCCC that I'd li
/archives//html/Topband/2020-03/msg00121.html (12,020 bytes)

13. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: John Kaufmann via Topband <topband@contesting.com>
Date: Wed, 11 Mar 2020 19:54:11 -0400
As the designer of the YCCC high impedance feedpoint amplifier, let me address some issues related to the design of the YCCC amplifier as well as feedpoint amplifiers in general. If you don't want to
/archives//html/Topband/2020-03/msg00122.html (14,158 bytes)

14. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Lee STRAHAN <k7tjr@msn.com>
Date: Thu, 12 Mar 2020 02:22:07 +0000
Hello John and all, Concerning the adding the noise in a typical array. If the noise was coherent or exactly the same signal from each element/amp the summed noise would indeed be 8 times. However ci
/archives//html/Topband/2020-03/msg00123.html (15,397 bytes)

15. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Wed, 11 Mar 2020 22:30:09 -0400
Here is an example at Digikey: ACX1545-ND Expensive, but... 73, George Can you point to a place that sells them. I became a 'fan' of F termination, but have recently had second thoughts because of th
/archives//html/Topband/2020-03/msg00124.html (8,849 bytes)

16. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Wed, 11 Mar 2020 21:39:48 -0700
What matters is the signal-to-noise ratio (SNR). Take the canonical example of an ideal 2-port Wilkinson power combiner with in-phase coherent signals of 10 Vrms applied to each input along with 1 Vr
/archives//html/Topband/2020-03/msg00125.html (17,272 bytes)

17. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 11 Mar 2020 22:16:52 -0700
On 3/11/2020 9:39 PM, Michael Tope wrote: The signal components add coherently at the combiner output yielding a total signal voltage of 14.14 Volts rms. The noise voltages are incoherent, so they ad
/archives//html/Topband/2020-03/msg00126.html (11,348 bytes)

18. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Lee STRAHAN <k7tjr@msn.com>
Date: Thu, 12 Mar 2020 05:23:41 +0000
Mike and all, Well stated Mike. It's been a long time since we have conversed. The modifier to this is when the signals coming into the combiner are no longer in phase or coherent. This as a result o
/archives//html/Topband/2020-03/msg00127.html (19,783 bytes)

19. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Thu, 12 Mar 2020 10:10:44 +0000
Thanks again for all the comments. Very interesting especially the reasoning behind the designs. The device I've picked for my design is the LTC6228. This is a new device by Analog Devices that only
/archives//html/Topband/2020-03/msg00128.html (8,223 bytes)

20. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: John Kaufmann via Topband <topband@contesting.com>
Date: Thu, 12 Mar 2020 11:13:48 +0000 (UTC)
Lee, I think you are confusing voltage and power.  For incoherent sources like amplifier noise, the voltages of multiple incoherent sources add in a root-sum-squared (RSS) fashion.  The voltage of th
/archives//html/Topband/2020-03/msg00129.html (17,582 bytes)

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