Re: 10MHz buffer amplifier


Many thanks for all the useful replies regarding the 10 MHz line driver. Perhaps a little more detail on my application is appropriate. I now have four portable systems for 23, 13, 6 and 3cms. As I have built each one I have built it as a standalone system with its own frequency reference so I now have an assortment of OCXO's of dubious origin and GPSDO's. I am now trying to integrate the four systems by using multi-band dish feeds and by reducing the number of support boxes. All four systems need a 10 MHz reference so I have invested in a high quality OCXO and now wish to feed it to all four systems. I am very space-limited and would like to put the system in the physical location of one of the GPSDO's. It means I have to build the unit into an identical box so the use of pre-built units is not appropriate.

The LM7171 has been suggested, but I tried this device driving 25MHz up a long piece of coax to the QO-100 LNB and found it was severely slew-rate limited. Changed to a BUF634 and this was OK. In this application the frequency is lower and the length of coax much less so the LM7171 may be OK. The BUF634 only has a gain of 0dB and in this case I need a gain of around 12dB so hence my quest for a suitable device.

I will follow-up some of the suggestions which may well be fruitful. Thanks once again for the assistance.


From: <> on behalf of Dennis Anderson via Groups.Io <g6ybc@...>
Sent: 03 January 2020 13:55
To: <>
Subject: Re: [UKMicrowaves] 10MHz buffer amplifier
I believe that SDR-Kits are selling some

Dennis G6YBC 

On Thursday, January 2, 2020, 10:14 pm, Neil Smith G4DBN <neil@...> wrote:

I have one of the 8-port kits still unbuilt, but I want to keep it to build on a special day. 

I already have one 4 port and one 8-port in use.  The 8-port was his first production upgrade board to turn a 4 into an 8.  They are by no means perfect, there is some port interaction and no transformer isolation.  When I boot my HP 8562A, it sends an output on the 10MHz port for a short time, which really messes up some of the other kit else connected to the same HUP box.

At this exact time I'm building a HUPrf e-field receive preamp and bias-tee kit.  I have seven more of those to build for a club project.

Sadly missed....

Neil G4DBN

On 02/01/2020 21:45, KENT BRITAIN wrote:
HUP had a kit for a 4 way 10 MHz divider.

Any of his kits still floating around?

Kent G8EMY

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