[TowerTalk] Receiver protectors and intermod, harmonics, etc.

[Tim Duffy]

Hello Don:

Where are you placing the RG-5000 in the chain? If the RG-5000 is behind the
Wellbrook active device, that might be an issue - that the mixing products
are a result of the active amplifier?

Do you use any bandpass filtering to knock down the high RF from the MW
transmitters?

73,
Tim K3LR


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Don
Moman VE6JY
Sent: Saturday, July 04, 2015 10:56 AM
To: TOWERTALK at contesting. com
Subject: Re: [TowerTalk] Receiver protectors and intermod, harmonics, etc.

Pete, I have the DXE RG-5000.  Altho I am 60km from the nearest mw
transmitters, I have lots of mixing products across the low bands when it
is installed, using one of the Wellbrook active loop antennas.  Before this
I used a home made device with parallel diodes and a small light bulb to
provide some measure of protection and no mixing issues.  After passing
thru an passive 8 way splitter, signal levels are in the -20 dbm range
which should be in their stated  "virtually RF transparent" area well below
its advertised -10dbm threshold.  It takes another 6 db pad eliminates the
products.   To use it on one of the low band full size dipoles here would
be impossible as they produce signal levels in the + a couple of dbm range.


73 Don
VE6JY




On Fri, Jul 3, 2015 at 7:46 PM, Pete Smith N4ZR <n4zr at contesting.com> wrote:

> Do the DX Engineering RG-5000 device, or the AS-RXFEP from Array
> Solutions) behave nicely when hit with a signal well above their
protection
> threshold, or dothey generate interference (noise, harmonics, intermod)
> from the energy that is blocked?
>
> Our particular application is for the RBN, involving a QS1R receiver very
> close to the antennas of an HF ionospheric radar operating on a couple of
> discrete frequency bands in the 8-18 MHz range with about 1 KW input
(don't
> know what the EIRP would be at the location of the receiver).
>
> Dx Engineering says their version offers "far lower harmonic and noise
> products across the spectrum than any competing RX front-end saving
> device,"  Would sure like to hear some impartial confirmation.
>
> --
>
> 73, Pete N4ZR
> Download the new N1MM Logger+ at
> <http://N1MM.hamdocs.com>. Check
> out the Reverse Beacon Network at
> <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
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