On Jan 22, 5:50 am, wrote:
On Jan 21, 2:28 pm, carlos2007
wrote:

Yes, I turn the tone control fully clockwise and move the passband
tuning too, but I cannot get improvement in weak signals.
I have tried with a multi mode audio filter, a Datong FL-3, no
results.
With respect to the antenna it is a Wellbrook 1530+.

Now, I hesitate in buying a R7A or a Collins 390A and to selling the
R8b.

--
carlos2007

- First of all, I'm glad that you are reconsidering
- buying a new expensive radio. It won't solve
- your problem, since I had the same issue with
- not understanding speech from weak tropical
- band signals with my R7.
- I had a Sherwood SE-3 synch detector
- (your R8B has a synch built-in) and ran the audio
- out to a good speaker, but still it was too bassy.
- I thought about using a graphic equalizer to adjust
- the tone. Here was some great advice I received
- on this forum years ago:

- "If bass rolloff is only what you're after. There is
- a simpler way. Put a non-polarized capacitor
- between the R--7 and the speaker. There are
- numerous nomographs for picking the right cap
- for your situation in most any radio handbook.
- Audio handbook, too, for that matter. But you'll
- likely want to cut and try anyway.
-
- Its simple, cost efficient, and it doesn't require
- a ground, so you can do it with most any radio."
-
- I went to a Radio Shack and looked through the
- catalog for the low cut-off frequency of different
- capacitors, and just attached one wire to the
- capacitor on one end, and put the other end into
- the speaker.
- Huge improvement. Experiment with different
- cut-off frequencies for your personal taste,
- shouldn't cost very much and certainly cheaper
- than a new rig.

WS - Great idea "Tip" and Cost effective Too !

tyvm ~ RHF

Carlos,

RL Drake R8B
http://www.universal-radio.com/used/UI93lrg.jpg
1 - AGC Feature : Turn it 'Off'
http://www.universal-radio.com/used/u880disp.jpg
2 - RF Gain Control : Turn it Down
http://www.universal-radio.com/used/u880pbt.jpg